SLAN-40E1ALR

The SLAN-40E1Ax modules are non -isolated DC-DC converters that can deliver up to 40A of output current.  These modules operate over a wide range of input voltage (VIN = 4.5 VDC-14.4 VDC) and provide a precisely regulated output voltage from 0.6 to 2.0 VDC, programmable via an external resistor. 

Features include remote On/Off, adjustable output voltage, over current and overtemperature protection. The module also includes the Tunable Loop[TM] feature that allows the user to optimize the dynamic response of the converter to match the load with reduced amount of 

- output capacitance leading to savings on cost and PWB area. • 4.5 VDC – 14.4 VDC Input • 0.6 VDC – 2.0 VDC / 40 A Outputs • Power Good signal • Remote On/Off • Over temperature protection • Compliant to IPC-9592 (September 2008), Category 2, Class II 

- x a • Compliant to RoHS EU Directive 2002/95/EC • Compatible in a Pb-free or SnPb reflow environment 

   - Output voltage programmable from 0.6 VDC to 2.0 VDC via external resistor 

   - Tunable Loop[TM] to optimize dynamic output voltage response 

   - Output overcurrent protection (non-latching) 

   - Wide operating temperature range [-40°C to 85°C] 

   - Wide Input voltage range (4.5VDC-14.4VDC). 

   - UL 60950-1 2nd Ed. Recognized, CSA C22.2 No. 60950-1-07 Certified, and VDE (EN60950-1 2nd Ed.) Licensed 

   - Small size:33.02 `×` 13.46 `×` 10.9 mm (1.3 `×` 0.53 `×` 0.429 in) 

   - Cost efficient open frame design 

   - Ability to sink and source current 

   - Fixed switching frequency with capability of external synchronization 

   - Distributed power architectures 

   - Servers and storage applications 

   - Intermediate bus voltage applications 

   - • Networking equipment • Telecommunications equipment • Industrial equipment 

ejees. Del 2kk:-POWER 

SLAN-40E1Ax Series 

2 

|**OUTPUT**<br>**VOLTAGE**|**INPUT**<br>**VOLTAGE**|**MAX. OUTPUT**<br>**CURRENT**|**MAX. OUTPUT**<br>**POWER**|**TYPICAL**<br>**EFFICIENCY**<br>**51VDC**|**MODEL**<br>**NUMBER**<br>**ACTIVE LOW**|**MODEL**<br>**NUMBER**<br>**ACTIVE HIGH**|
|---|---|---|---|---|---|---|
|0.6 – 2.0 VDC|4.5VDC – 14.VDC|4.5VDC – 14.VDC<br>40A|80W|91.5%|SLAN-40E1AL|SLAN-40E1A0|



**NOTE:** 1. Add “R” suffix at the end of the model number to indicate tape and reel packaging (Standard). 

2. Add “G” suffix at the end of the model number to indicate tray packaging (Option). 

3. For the SLAN-40E1A0, please contact your local Bel representative for availability. 

|**S**|**LAN**|**-**|**-**<br>**40**|**E**|**1A**|**0**|**x**|
|---|---|---|---|---|---|---|---|
|Mounting<br>type|Series code||Output current|Output current<br>Wide input<br>voltage range|sequencing|Logic<br>status|Package|
|Surface<br>mount|SLAN series||40 A|4.5 - 14.4 V|With sequencing|0 – active high<br>L – active low|G – tray<br>R –<br>tape&reel|



|**PARAMETER**|**DESCRIPTION**|**MIN**|**TYP**|**UNITS**|
|---|---|---|---|---|
|Continuous Input Voltage||-0.3|15|V|
|Operating Ambient Temperature|see Thermal Considerations section|-40|85|C|
|Storage Temperature||-55|125|C|
|Altitude||-|2000|m|



**NOTE:** Stresses in excess of the absolute maximum ratings can cause permanent damage to the device. These are absolute stress ratings only, functional operation of the device is not implied at these or any other conditions in excess of those given in the operations sections of the data sheet. Exposure to absolute maximum ratings for extended periods can adversely affect the device reliability. 

|**PARAMETER**|**DESCRIPTION**|**MIN**|**TYP**|**MAX**|**UNIT**|
|---|---|---|---|---|---|
|Operating Input Voltage||4.5|-|14.4|V|
|Input Current|VIN=4.5V to 14V, IO= IOmax|-|-|24|A|
|Input Current (no load)|VO,set = 0.6 VDC<br>VIN = 12VDC, IO = 0,<br>module enabled<br>VO,set = 2 VDC|-<br>-|54.7<br>104|-<br>-|mA|
|Input Stand-by Current|VIN = 12V, module disabled|-|12.5|-|mA|
|Input Reflected Ripple Current (pk-pk)|5Hz to 20MHz, 1μH source impedance; VIN =0 to<br>14V, IO= IOmax ; See Test Configurations|H source impedance; VIN =0 to<br>-|90|-|mAp-p|
|I2t Inrush Current Transient||-|-|1|A2s|
|Input Ripple Rejection (120Hz)||-|-60|-|dB|



**NOTE :** Unless otherwise indicated, specifications apply over all operating input voltage, resistive load, and temperature conditions. 

tech.support@psbel.com 

3 

## SLAN-40E1Ax Series 

|**PARAMETER**||**DESCRIPTION**|**MIN**|**TYP**|**MAX**|**UNIT**|
|---|---|---|---|---|---|---|
|Output Voltage Set Point|with 0.1% tolerance for external resistor used to set<br>output voltage||-1.0|-|+1.0|%Vo,set|
|Output Voltage|Over all operating input voltage, resistive load, and<br>temperature conditions until end of life||-3.0|-|+3.0|%Vo,set|
||1. selected by an external resistor||||||
|Adjustment Range|2.Some output voltages may not be possible depending||0.6|-|2.0|V|
||on the input voltage – see Feature Descriptions Section||||||
|Remote Sense Range|||-|-|0.5|V|
|Line Regulation|VIN=VIN, min to VIN, max||-|-|6|mV|
|Load Regulation|IO=IO, min to IO, max||-|-|10|mV|
|Temperature Regulation|Tref=TA, min to TA, max||-|0.4|-|%Vo,set|
|Output Current|In either sink or source mode||0|-|40|mV|
|Output Ripple and Noise (pk-pk)|5Hz to 20MHz BW, VIN=VIN, nom and IO=IO, min to IO,||-|50|100|mV|
|Output Ripple and Noise (rms)|max Co = 0.1μF // 22μF ceramic capacitors)||-|20|38|mV|
|Output Short-Circuit Current|Vo≤250mV, Hiccup Mode||-|2.1|-|Arms|
||Case 1: On/Off input is enabled and then input power is||||||
||applied (delay from instant at  which VIN = VIN, min until||1.0|1.1|1.7|ms|
|Turn-On Delay and Rise Times|Vo = 10% of Vo, set)||||||
|(VIN=VIN, nom, IO=IO, max , VO<br>to within ±1% of steady state.)|(VIN=VIN, nom, IO=IO, max , VO<br>Case 2: Input power is applied for at least one second<br>and then the On/Off input is enabled (delay from instant||600|700|1800|µs|
||at  which Von/Off is enabled until Vo =   10% of Vo, set)||||||
|Output voltage overshoot|VIn = VIn,min to VIn, max,IO = IO, min  to IO, max,<br>TA=25°C. With or without maximum external capacitance||-|1.5|3.0|%Vo, set.|
|Output voltage Rise time|Time for Vo to rise from<br>10% of Vo,set to 90% of Vo,set.||1.2|1.5|2.2|msec|
|Output<br>ESR≥1 mΩ|Without the Tunable LoopTM||6x47|-|6x47||
|Capacitance**<br>ESR≥0.15 mΩ|With the Tunable LoopTM||6x47|-|7000|µF|
|ESR≥10 mΩ|With the Tunable LoopTM||6x47|-|8500||
|Output Current Limit Inception|1. Hiccup Mode<br>2.Current limit does not operate in sink mode||-|150|-|% Io,max|



** External capacitors may require using the new Tunable Loop[TM] feature to ensure that the module is stable as well as getting the best transient response. See the Tunable Loop[TM] section for details. 

**NOTE** :  All specifications are typical at nominal input, full load at 25°C unless noted. 

**==> picture [51 x 30] intentionally omitted <==**

**----- Start of picture text -----**<br>
: “@miseig BESiiate<br>**----- End of picture text -----**<br>


**Asia-Pacific Europe, Middle East North America** +86 755 298 85888 +353 61 225 977 +1 408 785 5200 

© 2017 Bel Power Solutions & Protection 

Rev. E1 

SLAN-40E1Ax Series 

4 

|**PARAMETER**||**DESCRIPTION**|**MIN**|**TYP**|**MAX**|**MAX**|**UNIT**|
|---|---|---|---|---|---|---|---|
|||Vo=0.6V|78.0|81.3||-||
|Efficiency|Vin= 12 VDC, TA = 25°C<br>Io = Io, max , Vo = Vo,set|Vo=1.2V|84.0|88.5||-|%|
|||Vo=1.8V|85.25|85.25<br>91.5||-||
|Switching Frequency|||380|380<br>400||420|kHz|
|Synchronization Frequency<br>Range|||350|350<br>-||480|kHz|
|High-Level Input Voltage|||2.0|-||-|V|
|Low-Level Input Voltage|||-|-||0.4|V|
|Input Current, SYNC||||||100|nA|
|Minimum Pulse Width, SYNC|||100|100<br>-||-|ns|
|Maximum SYNC rise time|||100|100<br>-||-|ns|
|Over Temperature Protection|See Thermal Considerations section||123|123<br>130||137|C|
|Tracking Accuracy|Power-Up: 0.5V/ms||-|-||100|mV|
||Power-Down: 0.5V/ms||-|-||100||
||Overvoltage threshold for PGOOD ON||103|108|113||%Vo,<br>set|
||Overvoltage threshold for PGOOD OFF||105|110|115||%Vo,<br>set|
|PGOOD (Power Good)|PGOOD (Power Good)<br>Undervoltage threshold for PGOOD ON<br>Undervoltage threshold for PGOOD OFF|Signal Interface<br>Open Drain,<br>Vsupply5 VDC|87<br>85|92<br>90||97<br>95|%Vo,<br>set<br>%Vo,set|
||Pulldown resistance of PGOOD pin||-|-||50||
||Sink current capability into PGOOD pin||-|-||5|mA|
|Weight|||-|11.7||-|g|
||Turn-on Threshold||4.144|4.144<br>4.25|4.407|||
|Input Undervoltage Lockout|Turn-off Threshold||3.947|3.947<br>3.98|4.163||V|
||Hysteresis||0.25|0.3|0.35|||
|MTBF*|Calculated MTBF (IO=0.8IO, max, TA=40°C)<br>Telecordia Issue 2 Method 1 Case 3|||6,498,438|||hours|
|||||1.30×0.53×0.429||0.429|in|
|Dimensions (L × W × H)|||33.02×13.46×10.9||||mm|



**NOTE** : Unless otherwise indicated, specifications apply over all operating input voltage, resistive load, and    temperature condition 

**==> picture [51 x 30] intentionally omitted <==**

**----- Start of picture text -----**<br>
-@:ee<br>i<br>**----- End of picture text -----**<br>


tech.support@psbel.com 

5 

## SLAN-40E1Ax Series 

**==> picture [290 x 252] intentionally omitted <==**

**----- Start of picture text -----**<br>
9085 anne bsa]<br>Vin=4.5V<br>80 i a = ;<br>Vin=12V<br>Vin=14V<br>75 7  a/fe =ait<br>70 if |||<br>0 10 20 30 40 o<br>Figure 1. Vo=0.6V<br>100<br>Vin=12V<br>95 Tf id<br>90<br>85 Vin=4.5V Vin=14.4V<br>80 i ——f<br>7570 | |<br>0 10 20 30 40<br>Figure 3. Vo=1.8V<br>**----- End of picture text -----**<br>


**==> picture [67 x 8] intentionally omitted <==**

**----- Start of picture text -----**<br>
Figure 2. Vo=1.2V<br>**----- End of picture text -----**<br>


**==> picture [67 x 9] intentionally omitted <==**

**----- Start of picture text -----**<br>
Figure 4. Vo=0.6V<br>**----- End of picture text -----**<br>


**==> picture [158 x 119] intentionally omitted <==**

**----- Start of picture text -----**<br>
45<br>40<br>35 NC<br>30 R (100LFM)0.5m/s E 1m/s Y|<br>(200LFM)<br>25<br>20 Standard Part (85 C) (300LFM)1.5m/s<br>15 Ruggedized (D) Part (105 C) (400LFM)2m/s<br>10<br>45 55 65 75 85 95 105<br>Figure 5. Vo=1.2V<br>**----- End of picture text -----**<br>


**==> picture [157 x 119] intentionally omitted <==**

**----- Start of picture text -----**<br>
45<br>40<br>35 = NC r<br>30 0.5m/s<br>(100LFM) 1m/s<br>25 (200LFM)<br>1.5m/s PX<br>20<br>15 Standard Part (85 C) (400LFM)2m/s<br>10 Ruggedized (D) Part (105 C)<br>5 ><br>45 55 65 75 85 95 105<br>Figure 7. Vo=1.8V<br>**----- End of picture text -----**<br>


**Asia-Pacific Europe, Middle East North America** +86 755 298 85888 +353 61 225 977 +1 408 785 5200 

© 2017 Bel Power Solutions & Protection 

Rev. E1 

SLAN-40E1Ax Series 

6 

Figure 18.Vo=0.6V,  Io = Io,max, Vin=12V 

**==> picture [155 x 8] intentionally omitted <==**

**----- Start of picture text -----**<br>
Figure 19. Vo=1.2V,  Io = Io,max, Vin=12V<br>**----- End of picture text -----**<br>


**==> picture [153 x 9] intentionally omitted <==**

**----- Start of picture text -----**<br>
Figure 20. Vo=1.8V,  Io = Io,max, Vin=12V<br>**----- End of picture text -----**<br>


**NOTE** : Co=6X47µF ceramic 

Figure 21. Start-up Using On/Off Voltage (Io = Io,max),  Vo=0.6V 

Figure 22. Start-up Using On/Off Voltage (Io = Io,max),  Vo=1.2V 

**==> picture [51 x 23] intentionally omitted <==**

**----- Start of picture text -----**<br>
atefe:i,<br>**----- End of picture text -----**<br>


tech.support@psbel.com 

7 

## SLAN-40E1Ax Series 

Figure 23. Start-up Using On/Off Voltage (Io = Io,max),  Vo=1.8V 

Figure 24. Start-up Using Input Voltage (VIN = 12V, Io = Io,max ), Vo=0.60V 

Figure 25. Start-up Using Input Voltage (VIN = 12V, Io = Io,max ), Vo=1.2V 

Figure 26. Start-up Using Input Voltage (VIN = 12V, Io = Io,max ), Vo=1.8V 

**Asia-Pacific Europe, Middle East North America** +86 755 298 85888 +353 61 225 977 +1 408 785 5200 

© 2017 Bel Power Solutions & Protection 

Rev. E1 

SLAN-40E1Ax Series 

8 

## 10. TRANSIENT RESPONSE 

Figure 27. Transient Response to Dynamic Load Change from Figure 28. Transient Response to Dynamic Load Change from 50% to 100% at 12Vin, Cout= 12x680uF+6x47uF, CTune=47nF, 50% to 100% at 12Vin, Cout= 6x330uF, CTune=12nF & RTune=180 ohms,  Vo=0.6V RTune= 200 ohms,  Vo=1.2V 

Figure 29. Transient Response to Dynamic Load Change from 50% to 100% at 12Vin, Cout=6X330uF, CTune=5.6nF & RTune=220 ohms,  Vo=1.8V 

## **Input Filtering** 

The SLAN-40E1Ax module should be connected to a low ac-impedance source.  A highly inductive source can affect the stability of the module.  An input capacitance must be placed directly adjacent to the input pin of the module, to minimize input ripple voltage and ensure module stability. 

To minimize input voltage ripple, ceramic capacitors are recommended at the input of the module. Figure 19 shows the input ripple voltage for various output voltages at 40A of load current with 4x22 µF, 6x22µF or 8x22µF ceramic capacitors and an input of 12V. 

tech.support@psbel.com 

SLAN-40E1Ax Series 

9 

**==> picture [152 x 109] intentionally omitted <==**

**----- Start of picture text -----**<br>
400<br> 4x22uF Ext Cap<br>350  6x22uF Ext Cap<br>300250 Ee  8x22uF Ext Cap meeee_ ae<br>200<br>150<br>esa<br>100 6==<br>50 ee<br>0.6 0.8 1 1.2 1.4 1.6 1.8 2<br>Output Voltage (Volts)<br>Ripple Voltage (mVpk-pk)<br>**----- End of picture text -----**<br>


**NOTE** : Input ripple voltage for various output voltages with various external ceramic capacitors at the input (40A load). Input voltage is 12V. Scope Bandwidth limited to 20MHz. 

## **Output Filtering** 

These modules are designed for low output ripple voltage and will meet the maximum output ripple specification with 0.1 µF ceramic and 47 µF ceramic capacitors at the output of the module.  However, additional output filtering may be required by the system designer for a number of reasons.  First, there may be a need to further reduce the output ripple and noise of the module. Second, the dynamic response characteristics may need to be customized to a particular load step change. 

To reduce the output ripple and improve the dynamic response to a step load change, additional capacitance at the output can be used.  Low ESR polymer and ceramic capacitors are recommended to improve the dynamic response of the module. Figure 20 provides output ripple information for different external capacitance values at various Vo and a full load current of 40A.  For stable operation of the module, limit the capacitance to less than the maximum output capacitance as specified in the electrical specification table.  Optimal performance of the module can be achieved by using the Tunable Loop[TM] feature described later in this data sheet. 

**==> picture [156 x 122] intentionally omitted <==**

**----- Start of picture text -----**<br>
40<br>6x47uF Ext Cap<br>8x47uF Ext Cap<br>3020100 _ EaTT 10x47uF Ext Cap Tl | Ll<br>0.6 0.8 1 1.2 1.4 1.6 1.8 2<br>Output Voltage(Volts)<br>Ripple (mVp-p)<br>**----- End of picture text -----**<br>


**NOTE** : Output ripple voltage for various output voltages with external 6x47 µF, 8x47 µF or 10x47 µF ceramic capacitors at the output (40A load). Input voltage is 12V. Scope Bandwidth limited to 20MHz. 

## 12. SAFETY CONSIDERATIONS 

For safety agency approval the power module must be installed in compliance with the spacing and separation requirements of the end-use safety agency standards, i.e., UL 60950-1 2nd, CSA C22.2 No. 60950-1-07, DIN EN 60950-1:2006 + A11 (VDE0805 Teil 1 + A11):2009-11; EN 60950-1:2006 + A11:2009-03. 

For the converter output to be considered meeting the requirements of safety extra-low voltage (SELV), the input must meet SELV requirements.  The power module has extra-low voltage (ELV) outputs when all inputs are ELV. The input to these units is to be provided with a fast-acting fuse with a maximum rating of 30A, 100V (for example, Bel Fuse SMM series) in the positive input lead. 

**==> picture [205 x 38] intentionally omitted <==**

**----- Start of picture text -----**<br>
BOseee . bel SOLUTIONSPOWER &<br>**----- End of picture text -----**<br>


**Asia-Pacific Europe, Middle East North America** +86 755 298 85888 +353 61 225 977 +1 408 785 5200 

© 2017 Bel Power Solutions & Protection 

Rev. E1 

SLAN-40E1Ax Series 

10 

## 13. FEATURE DESCRIPTIONS 

|**PARAMETER**||**DESCRIPTION**|**MIN**|**TYP**|**MAX**|**UNIT**|
|---|---|---|---|---|---|---|
|Signal Low(Unit On)<br>Signal High(Unit Off)|Active Low|The remote on/off pin open, Unit on.|-0.3<br>2|-<br>-|0.4<br>VIn,max|V|
|Signal Low(Unit Off)<br>Signal High(Unit On)|Active High|The remote on/off pin open, Unit on.|-0.2<br>3.5|-<br>-|0.4<br>VIn,max|V|



The SLAN-40E1Ax modules feature an On/Off pin for remote On/Off operation.  Two On/Off logic options are available.  In the Positive Logic On/Off option, (device code suffix “0” – see Ordering Information), the module turns ON during a logic High on the On/Off pin and turns OFF during a logic Low.  With the Negative Logic On/Off option, (device code suffix “L” – see Ordering Information), the module turns OFF during logic High and ON during logic Low.  The On/Off signal should be always referenced to ground. For either On/Off logic option, leaving the On/Off pin disconnected will turn the module ON when input voltage is present. 

For positive logic modules, the circuit configuration for using the On/Off pin is shown in Figure 30. For negative logic On/Off modules, the circuit configuration is shown in Figure 31. 

**==> picture [152 x 121] intentionally omitted <==**

**----- Start of picture text -----**<br>
MODULE<br>VIN+<br>PWM Enable<br>Rpullup<br>I ON/OFF CR1 InternalPullup<br>VON/OFF+ 470 10K<br>ON/OFF Q1<br>10K<br>GND _<br>e s es<br>**----- End of picture text -----**<br>


Figure 30. Circuit configuration for using positive On/Off logic. 

Figure 31. Circuit configuration for using negative On/Off logic 

## 14. MONOTONIC START-UP AND SHUTDOWN 

The module has monotonic start-up and shutdown behavior for any combination of rated input voltage, output current and operating temperature range. 

## 15. STARTUP INTO PRE-BIASED OUTPUT 

The module can start into a prebiased output as long as the prebias voltage is 0.5V less than the set output voltage. 

## 16. ANALOG OUTPUT VOLTAGE PROGRAMMING 

The output voltage of the module is programmable to any voltage from 0.6DC to 2.0VDC by connecting a resistor between the Trim and SIG_GND pins of the module.  Certain restrictions apply on the output voltage set point depending on the input voltage. These are shown in the Output Voltage vs. Input Voltage Set Point Area plot in Figure 32.  The Upper Limit curve shows that for output voltages lower than 1V, the input voltage must be lower than the maximum of 14.4VDC. The Lower Limit curve shows that for output voltages higher than 0.6V, the input voltage needs to be larger than the minimum of 4.5 VDC. 

tech.support@psbel.com 

SLAN-40E1Ax Series 

11 

**==> picture [37 x 8] intentionally omitted <==**

**----- Start of picture text -----**<br>
Figure 32<br>**----- End of picture text -----**<br>


**NOTE** : Output Voltage vs. Input Voltage Set Point Area plot showing limits where the output voltage can be set for different input voltages. 

**==> picture [143 x 109] intentionally omitted <==**

**----- Start of picture text -----**<br>
VIN(+) VO(+)<br>VS+<br>ON/OFF<br>TRIM LOAD<br>Rtrim<br>SIG_GND<br>VS─<br>Figure 33.<br>**----- End of picture text -----**<br>


**CAUTION:** Do not connect SIG_GND to GND elsewhere in the layout. Circuit configuration for programming output voltage using an external resistor. 

Without an external resistor between Trim and SIG_GND pins, the output of the module will be 0.6 VDC.To calculate the value of the trim resistor, Rtrim for a desired output voltage, should be as per the following equation: 

|<br>_Rtrim_|<br><br><br><br><br><br><br><br>_k_<br>_Vo_<br>6.0<br>12<br>~~—_————~~|**VO, set (V)**<br>**RTRIM (KΩ) **<br>0.6<br>Open<br>~~hi~~|**VO, set (V)**<br>**RTRIM (KΩ) **<br>0.6<br>Open<br>~~hi~~|
|---|---|---|---|
|||0.9|40|
|Rtrim is the external resistor in k|Rtrim is the external resistor in kΩ|1.0<br>1.2|30<br>20|
|Vo is the desired output voltage.||1.5|13.33|
|||1.8|10|
|Table 1 provides Rtrim values required for some common output voltages.||||
|||Table 1.|Table 1.|



## 17. REMOTE SENSE 

The power module has a Remote Sense feature to minimize the effects of distribution losses by regulating the voltage between the sense pins (VS+ and VS-). The voltage drop between the sense pins and the VOUT and GND pins of the module should not exceed 0.5V. 

## 18. ANALOG VOLTAGE MARGINING 

Output voltage margining can be implemented in the module by connecting a resistor, Rmargin-up, from the Trim pin to the ground pin for margining-up the output voltage and by connecting a resistor, Rmargin-down, from the Trim pin to output pin for marginingdown.  Figure 34. shows the circuit configuration for output voltage margining.  The POL Programming Tool, available at 

**Asia-Pacific Europe, Middle East North America** +86 755 298 85888 +353 61 225 977 +1 408 785 5200 

© 2017 Bel Power Solutions & Protection 

Rev. E1 

SLAN-40E1Ax Series 

12 

www.belfuse.com under the Downloads section, also calculates the values of Rmargin-up and Rmargin-down for a specific output voltage and % margin.  Please consult your local Bel representative for additional details. 

**==> picture [112 x 123] intentionally omitted <==**

**----- Start of picture text -----**<br>
Vo<br>Rmargin-down<br>MODULE<br>Q2 AL.<br>Trim<br>Rmargin-up<br>Rtrim<br>S|<br>Q1 Al l .<br>SIG_GND<br>**----- End of picture text -----**<br>


Figure 34. Circuit Configuration for margining Output voltage. 

## 19. OUTPUT VOLTAGE SEQUENCING 

The power module includes a sequencing feature, EZ-SEQUENCE that enables users to implement various types of output voltage sequencing in their applications.  This is accomplished via an additional sequencing pin.  When not using the sequencing feature, leave it unconnected. 

The voltage applied to the SEQ pin should be scaled down by the same ratio as used to scale the output voltage down to the reference voltage of the module. This is accomplished by an external resistive divider connected across the sequencing voltage before it is fed to the SEQ pin as shown in Fig. 35. In addition, a small capacitor (suggested value 100pF) should be connected across the lower resistor R1.For SLAN-40E1Ax module,, the minimum recommended delay between the ON/OFF signal and the sequencing signal is 10ms to ensure that the module output is ramped up according to the sequencing signal. This ensures that the module soft-start routine is completed before the sequencing signal is allowed to ramp up. 

Figure 35. Circuit showing connection of the sequencing signal to the SEQ pin. 

When the scaled down sequencing voltage is applied to the SEQ pin, the output voltage tracks this voltage until the output reaches the set-point voltage.  The final value of the sequencing voltage must be set higher than the set-point voltage of the module.  The output voltage follows the sequencing voltage on a one-to-one basis. By connecting multiple modules together, multiple modules can track their output voltages to the voltage applied on the SEQ pin. 

The module’s output can track the SEQ pin signal with slopes of up to 0.5V/msec during power-up or power-down. 

To initiate simultaneous shutdown of the modules, the SEQ pin voltage is lowered in a controlled manner.  The output voltage of the modules tracks the voltages below their set-point voltages on a one-to-one basis.  A valid input voltage must be maintained until the tracking and output voltages reach ground potential. 

## re:on bel SOLUTIONSPOWER & 

tech.support@psbel.com 

SLAN-40E1Ax Series 

13 

## 20. OVERTEMPERATURE PROTECTION 

To provide protection in a fault condition, the unit is equipped with a thermal shutdown circuit. The unit will shut down if the overtemperature threshold of 145°C (typ) is exceeded at the thermal reference point Tref . Once the unit goes into thermal shutdown it will then wait to cool before attempting to restart. 

## 21. INPUT UNDERVOLTAGE LOCKOUT 

At input voltages below the input undervoltage lockout limit, the module operation is disabled.  The module will begin to operate at an input voltage above the undervoltage lockout turn-on threshold. 

## 22. SYNCHRONIZATION 

The module switching frequency can be synchronized to a signal with an external frequency within a specified range. Synchronization can be done by using the external signal applied to the SYNC pin of the module as shown in Fig. 36, with the converter being synchronized by the rising edge of the external signal. The Electrical Specifications table specifies the requirements of the external SYNC signal. If the SYNC pin is not used, the module should free run at the default switching frequency. 

**If synchronization is not being used, connect the SYNC pin to GND.** 

Figure 36. External source connections to synchronize switching frequency of the module. 

## 23. PARALLELING WITH ACTIVE LOAD SHARING 

For additional power requirements, the SLAN-40E1Ax module is also equipped with paralleling capability. Up to five modules can be configured in parallel, with active load sharing. 

To implement paralleling, the following conditions must be satisfied. 

1. All modules connected in parallel must be frequency synchronized where they are switching at the same frequency. This is done by using the SYNC function of the module and connecting to an external frequency source. Modules can be interleaved to reduce input ripple/filtering requirements. 

2. The share pins of all units in parallel must be connected together.  The path of these connections should be as direct as possible. 

3. The remote sense connections to all modules should be made that to the same points for the output, i.e. all VS+ and VSterminals for all modules are connected to the power bus at the same points. 

4. For converters operating in parallel, tunable loopcomponents “RTUNE” and “CTUNE” must be selected tomeet the required transient specification. For providingbetter noise immunity, we recommend that RTUNE valueto be greater than 300 Ω . 

Some special considerations apply for design of converters in parallel operation: 

When sizing the number of modules required for parallel operation, take note of the fact that current sharing has some tolerance. In addition, under transient conditions such as a dynamic load change and during startup, all converter output currents will not be equal. To allow for such variation and avoid the likelihood of a converter shutting off due to a current overload, the total capacity of the paralleled system should be no more than 90% of the sum of the individual converters. As an example, for a system of  three converters in parallel, the total current drawn should be less that 90% of (3 x 40A), i.e. less than 108 A. 

All modules should be turned ON and OFF together. This is so that all modules come up at the same time avoiding the problem of one converter sourcing current into the other leading to an overcurrent trip condition. To ensure that all modules come up simultaneously, the on/off pins of all paralleled converters should be tied together and the converters enabled and disabled using the on/off pin. Note that this means that converters in parallel cannot be digitally turned ON as that does not ensure that all modules being paralleled turn on at the same time. 

**Asia-Pacific Europe, Middle East North America** +86 755 298 85888 +353 61 225 977 +1 408 785 5200 

© 2017 Bel Power Solutions & Protection 

Rev. E1 

SLAN-40E1Ax Series 

14 

If digital trimming is used to adjust the overall output voltage, the adjustments need to be made in a series of small steps to avoid shutting down the output. Each step should be no more than 20mV for each module. For example, to adjust the overall output voltage in a setup with two modules (A and B) in parallel from 1V to 1.1V, module A would be adjusted from 1.0 to 1.02V followed by module B from 1.0 to 1.02V, then each module in sequence from 1.02 to 1.04V and so on until the final output voltage of 1.1V is reached. 

If the Sequencing function is being used to start-up and shut down modules and the module is being held to 0V by the tracking signal then there may be small deviations on the module output. This is due to controller duty cycle limitations encountered in trying to hold the voltage down near 0V. 

The share bus is not designed for redundant operation and the system will be non-functional upon failure of one of the units when multiple units are in parallel. In particular, if one of the converters shuts down during operation, the other converters may also shut down due to their outputs hitting current limit. In such a situation, unless a coordinated restart is ensured, the system may never properly restart since different converters will try to restart at different times causing an overload condition and subsequent shutdown. This situation can be avoided by having an external output voltage monitor circuit that detects a shutdown condition and forces all converters to shut down and restart together. 

When not using the active load share feature, share pins should be left unconnected. 

## 24. DUAL LAYOUT 

Identical dimensions and pin layout of Analog and Digital modules permit migration from one to the other without needing to change the layout. In both cases the trim resistor is connected between trim and signal ground. 

## 25. TUNABLE LOOP™ 

The module has a feature that optimizes transient response of the module called Tunable Loop[TM] . 

External capacitors are usually added to the output of the module for two reasons:  to reduce output ripple and noise (see Figure 20) and to reduce output voltage deviations from the steady-state value in the presence of dynamic load current changes. Adding external capacitance however affects the voltage control loop of the module, typically causing the loop to slow down with sluggish response.  Larger values of external capacitance could also cause the module to become unstable. 

The Tunable Loop[TM] allows the user to externally adjust the voltage control loop to match the filter network connected to the output of the module. The Tunable Loop[TM] is implemented by connecting a series R-C between the VS+ and TRIM pins of the module, as shown in Fig. 37. This R-C allows the user to externally adjust the voltage loop feedback compensation of the module. 

Figure 37. Circuit diagram showing connection of RTUME and CTUNE  to tune the control loop of the module. 

Recommended values of RTUNE and CTUNE for different output capacitor combinations are given in Table 2. Table 2 shows the recommended values of RTUNE and CTUNE for different values of ceramic output capacitors up to 1000uF that might be needed for an application to meet output ripple and noise requirements. Selecting RTUNE and CTUNE according to Table 2 will ensure stable operation of the module. 

In applications with tight output voltage limits in the presence of dynamic current loading, additional output capacitance will be required. Table 3 lists recommended values of  RTUNE and CTUNE in order to meet 2% output voltage deviation limits for some common output voltages in the presence of a 20A to 40A step change (50% of full load), with an input voltage of 12V. 

## Oe:eee bel SOLUTIONSPOWER & 

tech.support@psbel.com 

15 

## SLAN-40E1Ax Series 

Please contact your Bel Power technical representative to obtain more details of this feature as well as for guidelines on how to select the right value of external R-C to tune the module for best transient performance and stable operation for other output capacitance values. 

|**Co**|**6x47****F**|**8x47****F**|**10x47****F**|**12x47****F**|**20x47****F**|
|---|---|---|---|---|---|
|**RTUNE**|330Ω|330Ω|330Ω|330Ω|200Ω|
|**CTUNE**|330pF|820pF|1200pF|1500pF|3300pF|
||||Table 2.|||



General recommended values of of RTUNE and CTUNE for Vin=12V and various external ceramic capacitor combinations. 

|**Vo**||**1.8V**|**1.2V**|**0.6V**|
|---|---|---|---|---|
|**Co**|4x47uF + 6x330µF polymer|4x47uF + 6x330µF polymer|4x47uF + 11x330µF polymer|4x47uF + 12x680µF polymer|
|**RTUNE**||220Ω|200Ω|180Ω|
|**CTUNE**||5600pF|12nF|47nF|
|**V**||34mV|22mV|12mV|
||||Table 3.||



Recommended values of RTUNE and CTUNE to obtain transient deviation of 2% of Vout for a 20A step load with Vin=12V. 

**NOTE** : The capacitors used in the Tunable Loop tables are 47 μ F/3 m Ω ESR ceramic, 330 μ F/12 m Ω ESR polymer capacitor and 680 μ F/12 m Ω polymer capacitor 

## 26. THERMAL CONSIDERATION 

Power modules operate in a variety of thermal environments; however, sufficient cooling should always be provided to help ensure reliable operation. 

Considerations include ambient temperature, airflow, module power dissipation, and the need for increased reliability. A reduction in the operating temperature of the module will result in an increase in reliability. The thermal data presented here is based on physical measurements taken in a wind tunnel.  The test set-up is shown in Figure 38. The preferred airflow direction for the module is in Figure 39. 

**==> picture [167 x 172] intentionally omitted <==**

**----- Start of picture text -----**<br>
25.4_<br>Wind Tunnel (1.0)<br>— 4<br>PWBs<br>Power Module<br>76.2_<br>(3.0)<br>x<br>Probe Location<br>for measuring<br>12.7_ airflow and<br>(0.50) ambient<br>temperature<br>Air<br>flow<br>**----- End of picture text -----**<br>


**Asia-Pacific Europe, Middle East North America** +86 755 298 85888 +353 61 225 977 +1 408 785 5200 

© 2017 Bel Power Solutions & Protection 

Rev. E1 

SLAN-40E1Ax Series 

16 

Figure 38. Thermal Test Setup 

Figure 39. Preferred airflow direction and location of hot-spot of the module (Tref). 

## 27. EXAMPLE APPLICATION CIRCUIT 

## **Requirements:** 

Vin: 12V Vout: 1.8V Iout: 30A max., worst case load transient is from 20A to 30A  Vout: 1.5% of Vout (27mV) for worst case load transient Vin, ripple 1.5% of Vin (180mV, p-p) 

**==> picture [276 x 112] intentionally omitted <==**

**----- Start of picture text -----**<br>
Vin+  Vout+<br>VIN  VOUT<br>VS+<br>PGOOD<br>RTUNE<br>MODULE<br>SEQ<br>CTUN E<br>CI3 CI2 CI1 TRIM  CO1 CO2 CO3<br>RTrim<br>ON/OFF<br>SIG_GND<br>SYN GND  VS-<br>GND<br>**----- End of picture text -----**<br>


CI1 Decoupling cap - 1x0.01  F/16V ceramic capacitor (e.g. Murata LLL185R71E103MA01) CI2 3x22  F/16V ceramic capacitor (e.g. Murata GRM32ER61C226KE20) CI3                      470  F/16V bulk electrolytic CO1                    Decoupling cap - 1x0.01  F/16V ceramic capacitor (e.g. Murata LLL185R71E103MA01) CO2 4 x 47µF/6.3V ceramic capacitor (e.g. Murata GRM31CR60J476ME19) CO3                    6 X330µF/6.3V Polymer (e.g. Sanyo Poscap) CTune 5600pF ceramic capacitor (can be 1206, 0805 or  0603 size) RTune 220 ohms SMT resistor (can be 1206, 0805 or 0603 size) RTrim 10k  SMT resistor (can be 1206, 0805 or 0603 size, recommended tolerance of 0.1%) 

**==> picture [51 x 30] intentionally omitted <==**

**----- Start of picture text -----**<br>
@. :<br>**----- End of picture text -----**<br>


tech.support@psbel.com 

17 

## SLAN-40E1Ax Series 

## 28. MECHANICAL OUTLINE 

Dimensions are in millimeters and (inches). 

Tolerances: x.x mm  0.5 mm (x.xx in.  0.02 in.) [unless otherwise indicated] 

x.xx mm  0.25 mm (x.xxx in  0.010 in.) 

**==> picture [226 x 52] intentionally omitted <==**

**----- Start of picture text -----**<br>
PIN CONNECTIONS<br>PIN  FUNCTION  PIN  FUNCTION<br>1  ON/OFF  11  SIG_GND<br>2  VIN  12  VS-<br>3  SEQ  13  NC<br>**----- End of picture text -----**<br>


**==> picture [248 x 37] intentionally omitted <==**

**----- Start of picture text -----**<br>
Asia-Pacific  Europe, Middle East  North America<br>+86 755 298 85888 +353 61 225 977 +1 408 785 5200<br>© 2017 Bel Power Solutions & Protection Rev. E1<br>**----- End of picture text -----**<br>


SLAN-40E1Ax Series 

18 

|4|GND|14|NC|
|---|---|---|---|
|5|VOUT|15|SYNC|
|6|TRIM|16|PG|
|7|VS+|17|NC|
|8|GND|18|NC|
|9|SHARE|19|NC|
|10|GND|||



## 29. RECOMMENDED PAD LAYOUT 

Dimensions are in millimeters and (inches). 

Tolerances: x.x mm  0.5 mm (x.xx in.  0.02 in.) [unless otherwise indicated] x.xx mm  0.25 mm (x.xxx in  0.010 in.) 

||**PIN CONNECTIONS**|**PIN CONNECTIONS**||
|---|---|---|---|
|**PIN**|**FUNCTION**|**PIN**|**FUNCTION**|
|1|ON/OFF|11|SIG_GND|
|2|VIN|12|VS-|
|3|SEQ|13|NC|
|4|GND|14|NC|
|5|VOUT|15|SYNC|
|6|TRIM|16|PG|
|7|VS+|17|NC|
|8|GND|18|NC|
|9|SHARE|19|NC|
|10|GND|||



**==> picture [17 x 9] intentionally omitted <==**

**----- Start of picture text -----**<br>
es<br>**----- End of picture text -----**<br>


tech.support@psbel.com 

19 

## SLAN-40E1Ax Series 

## 30. PACKAGING DETAILS 

The SLAN-40E1Ax modules are supplied in tape & reel as standard. All Dimensions are in millimeters and (in inches) 

**Reel Dimensions:** Outside Dimensions: 330.2 mm (13.00) Inside Dimensions: 177.8 mm (7.00”) Tape Width: 56.00 mm (2.205”) 

**==> picture [3 x 14] intentionally omitted <==**

**----- Start of picture text -----**<br>
ay<br>**----- End of picture text -----**<br>


**Asia-Pacific Europe, Middle East North America** +86 755 298 85888 +353 61 225 977 +1 408 785 5200 

© 2017 Bel Power Solutions & Protection 

Rev. E1 

SLAN-40E1Ax Series 

20 

## 31. SURFACE MOUNT INFORMATION 

## **Pick and Place** 

The SLAN-40E1Ax modules use an open frame construction and are designed for a fully automated assembly process.  The modules are fitted with a label designed to provide a large surface area for pick and place operations.  The label meets all the requirements for surface mount processing, as well as safety standards, and is able to withstand reflow temperatures of up to 300oC.  The label also carries product information such as product code, serial number and the location of manufacture. 

## **Bottom Side / First Side Assembly** 

This module is not recommended for assembly on the bottom side of a customer board. If such an assembly is attempted, components may fall off the module during the second reflow process. 

## **Lead Free Soldering** 

The modules are lead-free (Pb-free) and RoHS compliant and fully compatible in a Pb-free soldering process.  Failure to observe the instructions below may result in the failure of or cause damage to the modules and can adversely affect long-term reliability. 

## **Pb-free Reflow Profile** 

Power Systems will comply with J-STD-020 Rev. C (Moisture/Reflow Sensitivity Classification for Nonhermetic Solid State Surface Mount Devices) for both Pb-free solder profiles and MSL classification procedures.  This standard provides a recommended forcedair-convection reflow profile based on the volume and thickness of the package (table 4-2).  The suggested Pb-free solder paste is Sn/Ag/Cu (SAC). The recommended linear reflow profile using Sn/Ag/Cu solder is shown in Fig. 40. Soldering outside of the recommended profile requires testing to verify results and performance. 

## **MSL Rating** 

The SLAN-40E1Ax modules have a MSL rating of 2A. 

## **Storage and Handling** 

The recommended storage environment and handling procedures for moisture-sensitive surface mount packages is detailed in J- STD-033 Rev. A (Handling, Packing, Shipping and Use of Moisture/Reflow Sensitive Surface Mount Devices).  Moisture barrier bags (MBB) with desiccant are required for MSL ratings of 2 or greater.  These sealed packages should not be broken until time of use. Once the original package is broken, the floor life of the product at conditions of  30°C and 60% relative humidity varies according to the MSL rating (see J-STD-033A).  The shelf life for dry packed SMT packages will be a minimum of 12 months from the bag seal date, when stored at the following conditions:  < 40° C, < 90% relative humidity. 

**==> picture [182 x 124] intentionally omitted <==**

**----- Start of picture text -----**<br>
300<br>Per J-STD-020 Rev. C<br>Peak Temp 260°C<br>250<br>Cooling<br>200 Zone<br>* Min. Time Above 235°C<br>             15 Seconds<br>150<br>Heating Zone *Time Above 217°C<br> 1°C/Second         60 Seconds<br>100<br>50<br>0<br>Reflow Time (Seconds)<br>Reflow Temp (°C)<br>**----- End of picture text -----**<br>


Figure 40. Recommended linear reflow profile using Sn/Ag/Cu solder. 

## **Post Solder Cleaning and Drying Considerations** 

Post solder cleaning is usually the final circuit-board assembly process prior to electrical board testing. The result of inadequate cleaning and drying can affect both the reliability of a power module and the testability of the finished circuit-board assembly. For guidance on appropriate soldering, cleaning and drying procedures, refer to Board Mounted Power Modules: Soldering and Cleaning Application Note (AN04-001). 

**==> picture [204 x 36] intentionally omitted <==**

**----- Start of picture text -----**<br>
re.eZsees  bel SOLUTIONSPOWERPROTECTION &<br>**----- End of picture text -----**<br>


tech.support@psbel.com . 

21 

## SLAN-40E1Ax Series 

## 32. REVISION HISTORY 

**==> picture [479 x 109] intentionally omitted <==**

**----- Start of picture text -----**<br>
|||||
|---|---|---|---|
|DATE|REVISION|CHANGES DETAIL|APPROVAL|
|2012-09-11|A|First release|HL LU|
|2012-12-11|B|Update paralleling with active load sharing.|HL LU|
|Update output capacitance, synchronization frequency range, safety considerations,|
|2013-07-16|C|analog output voltage programming, Tunable Loop, example application circuit, MSL|XF Jiang|
|rating; add transient waveforms, power good section.|
|2013-08-01|D|Update the Over temperature Protection|XF Jiang|
|Update part selection, absolute maximum ratings, output specifications, general|
|2015/7/17|E|XF Jiang|
|specifications, paralleling with active load sharing, tunable loop and packaging details.|

**----- End of picture text -----**<br>


**NUCLEAR AND MEDICAL APPLICATIONS** - Products are not designed or intended for use as critical components in life support systems, equipment used in hazardous environments, or nuclear control systems. 

**TECHNICAL REVISIONS** - The appearance of products, including safety agency certifications pictured on labels, may change depending on the date manufactured. Specifications are subject to change without notice. 

@8 

**Asia-Pacific Europe, Middle East North America** +86 755 298 85888 +353 61 225 977 +1 408 785 5200 

© 2017 Bel Power Solutions & Protection 

Rev. E1