LYT1603D-TL

## **LYT1402-1604 LYTSwitch-1** Family 

Single-Stage LED Driver IC with Combined PFC and Constant Current Output for Buck Topology 

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Product Highlights<br>Single-Stage PFC + Accurate CC Output DM BPS<br>• +/- 3% CC regulation in single line input voltage applications<br>• Power factor > 0.9 FB<br>• High efficiency > 93% LYTSwitch-1<br>• Robust 725 V MOSFET for increased line voltage surge performance<br>• Critical Conduction Mode (CrM) buck<br>• Low EMI<br>• Excellent line noise and transient rejection<br>Design Flexibility<br>• Supports high- and low-side buck topologies<br>• Wide input (90 VAC – 308 VAC) and output voltage range operation sae<br>• 3 family members cover power range for optimum device selection PI-7906-050316<br>• Requires no inductor bias winding Figure 1a. High-Side Buck − Typical Application Schematic.<br>Highest Reliability<br>• Lowest component count<br>• Comprehensive protection features with auto-restart<br>• Input and output overvoltage protection (OVP)<br>• Output short-circuit protection<br>• Open-loop protection<br>• Advanced thermal control<br>• Thermal foldback ensures that light continues to be delivered at<br>elevated temperatures<br>• Over-temperature shutdown provides protection during fault LYTSwitch-1<br>conditions FB<br>S D<br>Description BP M PI-7905-050316<br>The LYTSwitch™-1 family is ideal for single-stage, high PF, constant<br>current LED bulbs and tubes. tha LI<br>Figure 1b. Low-Side Buck − Typical Application Schematic.<br>**----- End of picture text -----**<br>


The family incorporates a high-voltage MOSFET with a variable on-time CrM controller.  Extensive protection features with minimum external components provide industry leading power density and functionality. The devices can be used in high-side or low-side non-isolated buck topology. 

## **Output Power Table[1]** 

|**Product3**|**Optimized for Smallest Components**|**Optimized for Smallest Components**|
|---|---|---|
||VOUT≤ 30 V2|45 V ≤ VOUT≤ 55 V2|
|**LYT1402D**<br>**LYT1403D**<br>**LYT1404D**|4.0 W<br>7.5 W<br>11 W|8.0 W<br>15 W<br>22 W|
|**Product3**|**Optimized for Lowest THD**||
||VOUT≤ 30 V2|VOUT≥  55 V2|
|**LYT1602D**<br>**LYT1603D**<br>**LYT1604D**|4.0 W<br>7.5 W<br>11 W|8.0 W<br>15 W<br>22 W|



The CrM operation results in low turn-on losses and reduces cost of output diode (slower reverse recovery). 

LYTSwitch-1 devices are suitable for applications from 2 W to 22 W. See Table 1 for selection guidance. 

Figure 2. SO-8 D Package. 

Table 1.    Output Power Table (Buck Topology). Notes: 

1. Maximum practical continuous power in an open frame design with adequate heat sinking, measured at 50˚C ambient. 

2. Output power scales linearly if VOUT falls in between the specified voltages. 

3. Package: SO-8 (D Package). 

June 2016 

www.power.com 

This Product is Covered by Patents and/or Pending Patent Applications. 

**LYT1402-1604** 

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DRAIN<br>(D)<br>BYPASS<br>INPUT IOVP ILIMIT REGULATOR (BP)<br>SOA 5.25 V<br>LINE Line_Comp<br>SENSE<br>THERMAL OTP<br>SHUTDOWN<br>MULTI-<br>FUNCTION<br>(M) ZERO<br>CURRENT<br>DETECTION<br>OOVP SOURCE<br>VOUT (S)<br>SENSE VOUT_SS FAULT FAULT<br>HANDLING<br>UV<br>4.5 V<br>SYSTEM<br>CLOCK<br>IVALLEY AC_High<br>0.7 × VFB(REF) CONTROL UP/DN TON<br>R1 LOGIC COUNTER STATE S Q<br>0 V IPK AC_Valley MACHINE<br>R Q<br>FEEDBACK R2<br>(FB)<br>PI-7907-040416<br>**----- End of picture text -----**<br>


Figure 2. Block Diagram. 

## **Pin Functional Description** 

## **BYPASS (BP) Pin:** 

5.25 V supply rail. 

## **MULTIFUNCTION (M) Pin:** 

Mode 1: FET OFF 

- Detection of inductor de-magnetization (ZCD) to ensure CrM. 

- Output OVP Sensing (120 % of VOUT nominal). 

- Steady-state operation voltage range is [1 V – 2.4 V]. 

- Mode 2: FET ON 

- Line OVP. 

## **FEEDBACK (FB) Pin:** 

- FET current sensing using external current sense resistor. 

- Normal operation voltage range is [VFB(REF) – 0 V]. 

## **DRAIN (D) Pin:** 

High-voltage internal MOSFET. 

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D Package (SO-8)<br>1 8<br>BP S<br>2 7<br>M S<br>3 6<br>FB S<br>4 5<br>D S<br>PI-7908-032216<br>**----- End of picture text -----**<br>


Figure 3. Pin Configuration. 

## **SOURCE (S) Pin:** 

Power and signal ground. 

**2** 

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**LYT1402-1604** 

## **Absolute Maximum Ratings[(1,3)]** 

|DRAIN Pin Voltage:<br>LYT1x0x............................ -0.3 V to 725 V|
|---|
|DRAIN Pin Peak Current: LYT1x02 ...........................1.05 A (1.3 A)(1)|
|LYT1x03 .............................2.1 A (2.6 A)(1)|
|LYT1x04 ............................ 2.8 A (3.5 A)(1)|
|BYPASS Pin Voltage ...................................................-0.3 V to 6.0 V|
|MULTIFUNCTION, FEEDBACK Pin Voltage ................ -0.45 V to 7.0 V(2)|
|Lead Temperature ................................................................ 260 °C|
|Storage Temperature ...................................................-65 to 150 °C|
|Operating Junction Temperature ................................ -40 to 150 °C(4)|



## Notes: 

1. The higher peak Drain current (in parentheses) is allowed while the Drain voltage is simultaneously less than 400 V for 725 V integrated MOSFET. 

2. In case SOURCE pin is open, -0.7 V between FEEDBACK pin and SOURCE pin is observed with no degradation in performance. 

3. The Absolute Maximum Ratings specified may be applied,  one at a time without causing permanent damage to the product. Exposure to Absolute Maximum Ratings for extended periods of time may affect product reliability. 

4. Normally limited by internal circuitry. 

## **Thermal Resistance** 

Thermal Resistance: SO-8 Package: (qJA) ................................100 °C/W[(2)] , 80 °C/W[(3)] (qJC)[(1)] ................................................ 30 °C/W 

## Notes: 

1. Measured on the SOURCE pin close to plastic interface. 

2. Soldered to 0.36 sq. inch (232 mm[2] ) 2 oz. (610 g/m[2] ) copper clad, with no external heat sink attached. 

3. Soldered to 1 sq. in. (645 mm[2] ), 2 oz, (610 g/m[2] ) copper clad. 

|**Parameter**|**Symbol**|**Conditions**<br>SOURCE = 0 V<br>TJ= -40 °C to 125 °C<br>(Unless Otherwise Specifed)|**Conditions**<br>SOURCE = 0 V<br>TJ= -40 °C to 125 °C<br>(Unless Otherwise Specifed)|**Min**|**Typ**|**Max**|**Units**|
|---|---|---|---|---|---|---|---|
|**Control Functions**||||||||
|**Minimum Switching**<br>**Frequency**|fMIN|||18|20|22|kHz|
|**Maximum Switch**<br>**ON-Time**|TON(MAX)|||37.5|40|45|µs|
|**Minimum Switch**<br>**ON-Time**|TON(MIN)|||1.012|1.1|1.25|µs|
|**FEEDBACK Pin**<br>**Reference Voltage**|VFB(REF)|TJ= 25 °C||-283|-280|-277|mV|
|**Dead Zone Detect**<br>**Threshold**|VTH(DZ)||||0.3 ×<br>VFB(REF)||V|
|**Maximum Constant**<br>**Current Zone**|TCC(MAX)||||6||ms|
|**Forced Minimum**<br>**Constant Current Zone**|TCC(MIN)||||1.2||ms|
|**BYPASS Pin**<br>**Supply Current**|ISBY|Standby (MOSFET not switching)|||180||µA|
||IDSS|MOSFET Switching|LYT1x02||680||µA|
||||LYT1x03||785|||
||||LYT1x04||850|||
|**BYPASS Pin**<br>**Charge Current**|ICH1|VBP= 0.0 V, VDS≥ 36 V||-10|-4.5||mA|
||ICH2|VBP= 5.0 V, VDS≥ 36 V||-6|-2||mA|
|**BYPASS Pin Voltage**|VBP|||5.075|5.22|5.35|V|



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**LYT1402-1604** 

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Conditions<br>SOURCE = 0 V<br>Parameter Symbol Min Typ Max Units<br>TJ = -40 °C to 125 °C<br> (Unless Otherwise Specified)<br>Control Functions (cont.)<br>BYPASS Pin<br>V 5.2 5.39 5.55 V<br>Shunt Voltage BP(SHUNT)<br>BYPASS Pin Power-Up<br>V 4.35 4.5 4.65 V<br>Reset Threshold Voltage BP(RESET)<br>Circuit Protection<br>**----- End of picture text -----**<br>


|||||||||
|---|---|---|---|---|---|---|---|
|**Current Limit for**<br>**Auto-Restart**|ILIMIT(AR)|di/dt = 277 mA/µs<br>TJ= 25 °C|LYT1x02|0.59|0.65|0.70|A|
|||di/dt = 446 mA/µs<br>TJ= 25 °C|LYT1x03|1.06|1.15|1.24||
|||di/dt = 662 mA/µs<br>TJ= 25 °C|LYT1x04|1.61|1.75|1.88||
|**Fault Minimum Switch**<br>**ON-Time**|TFAULT(MIN)||||250|400|ns|
|**Auto-Restart**|TAR(OFF)1|TJ= 25 °C|||100||ms|
||TAR(OFF)2||||1000|||
|**Input Overvoltage**<br>**Threshold**|IIOV|TJ= 25 °C||0.9|1.0|1.1|mA|
|**MULTIFUNCTIONAL Pin**<br>**Auto-Restart Threshold**<br>**Voltage (Output OVP)**|VOOV|TJ= 25 °C||2.3|2.4|2.48|V|
|**MULTIFUNCTIONAL Pin**<br>**Undervoltage Threshold**<br>**(Output Short)**|VOUV|TJ= 25 °C<br>See Note B||0.91|0.95|0.99|V|
|**Junction Temperature**<br>**at Fold-Back**|TFB|See Note B||138|145|152|°C|
|**Thermal Shutdown**<br>**Temperature**|TSD|See Note A|||160||°C|
|**Thermal Shutdown**<br>**Hysteresis**|TSD(H)|See Note A|||75||°C|



**4** 

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**LYT1402-1604** 

|**Parameter**|**Symbol**|**Conditions**<br>SOURCE = 0 V<br>TJ= -40 °C to 125 °C<br>(Unless Otherwise Specifed)|**Conditions**<br>SOURCE = 0 V<br>TJ= -40 °C to 125 °C<br>(Unless Otherwise Specifed)|**Min**|**Typ**|**Max**|**Units**|
|---|---|---|---|---|---|---|---|
|**Output**||||||||
|**ON-State Resistance**|RDS(ON)|LYT1x02<br>ID= 91 mA|TJ= 25°C||9.2|10.6|W|
||||TJ= 100°C||14.0|16.1||
|||LYT1x03<br>ID= 139 mA|TJ= 25°C||4.5|5.2||
||||TJ= 100°C||6.8|7.8||
|||LYT1x04<br>ID= 182 mA|TJ= 25°C||3.4|3.9||
||||TJ= 100°C||5.1|5.8||
|**OFF-State Leakage**|IDSS1|VBP= 5.25 V,<br>VDS= 580 V<br>TJ= 125 °C|LYT1x02|||40|µA|
||||LYT1x03|||55||
||||LYT1x04|||70||
|**Breakdown Voltage**|BVDSS|LYT1x0x||725|||V|



NOTES: 

A. Guaranteed by design. 

- B. This parameter is derived from characterization. Non-production test. 

**5** 

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**LYT1402-1604** 

## **Typical Performance Characteristics** 

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1.2<br>TCASE = 25 °C<br>TCASE = 100 °C<br>1<br>0.8<br>0.6<br>0.4<br>Scaling Factors:<br>LYT1x02  1.0<br>0.2 LYT1x03  2.0<br>LYT1x04  2.7<br>0<br>0 2 4 6 8 10 12 14 16 18 20<br>DRAIN Voltage (V)<br>PI-7970-052616<br>DRAIN Pin Current (A)<br>**----- End of picture text -----**<br>


Figure 1. DRAIN Pin Current vs. Drain Pin Voltage. 

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1000<br>Scaling Factors:<br>LYT1x02  1.0<br>LYT1x03  2.0<br>LYT1x04  2.7<br>100<br>10<br>1<br>0 50 100 150 200 250 300 350 400 450<br>DRAIN Voltage (V)<br>PI-7971-052616<br>DRAIN Pin Capacitance (pF)<br>**----- End of picture text -----**<br>


Figure 2. DRAIN Pin Capacitance vs. DRAIN Pin Voltage. 

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1.2<br>1<br>0.8<br>0.6<br>0.4<br>0.2<br>0<br>0 100 200 300 400 500 600 700 800<br>DRAIN Voltage (V)<br>PI-7972-052616<br>DRAIN Pin Current (A)<br>(Normalized to Absolute Max Rating)<br>**----- End of picture text -----**<br>


Figure 3. Maximum Allowable DRAIN Pin Current vs. DRAIN Pin Voltage. 

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**LYT1402-1604** 

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SO-8 (D Package)<br>0.10 (0.004)  C A-B 2X<br>2 DETAIL A<br>4 B<br>4.90 (0.193) BSC<br>4<br>D<br>8 5<br>GAUGE<br>PLANE<br>SEATING<br>PLANE<br>2 3.90 (0.154) BSC 6.00 (0.236) BSC C 0 - 8 o<br>0.25 (0.010)<br>1.04 (0.041) REF<br>BSC<br>0.10 (0.004)  C D<br>0.40 (0.016)<br>2X<br>Pin 1 ID 1 4 0.20 (0.008)  C 1.27 (0.050)<br>1.27 (0.050) BSC 2X<br>7X 0.31 - 0.51 (0.012 - 0.020)<br>0.25 (0.010) M C A-B D<br>1.35 (0.053) 1.25 - 1.65<br>DETAIL A<br>1.75 (0.069) (0.049 - 0.065)<br>0.10 (0.004) 0.10 (0.004)  C H<br>0.25 (0.010) 7X<br>SEATING PLANE<br>C 0.17 (0.007)<br>0.25 (0.010)<br>Reference<br>Solder Pad +<br>Dimensions<br>Notes:<br>1. JEDEC reference: MS-012.<br>1.45 (0.057) 4.00 (0.157) 5.45 (0.215) 2. Package outline exclusive of mold flash and metal burr.<br>3. Package outline inclusive of plating thickness.<br>4. Datums A and B to be determined at datum plane H.<br>+ + + 5. Controlling dimensions are in millimeters. Inch dimensions<br>    are shown in parenthesis. Angles in degrees.<br>D08A 1.27 (0.050) 0.60 (0.024)<br>PI-5615-020515<br>A<br>**----- End of picture text -----**<br>


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**LYT1402-1604** 

## **MSL Table** 

|**Part Number**|**MSL Rating**|
|---|---|
|LYT1402D|1|
|LYT1403D|1|
|LYT1404D|1|
|LYT1602D|1|
|LYT1603D|1|
|LYT1604D|1|



## **ESD and Latch-Up Table** 

|**ESD and Latch-Up Table**|||
|---|---|---|
|**Test**|**Conditions**|**Results**|
|Latch-up at 125 °C<br>Human Body Model ESD<br>Machine Model ESD<br>Charged Device Model ESD|JESD78D<br>ANSI/ESDA/JEDEC JS-001-2012<br>JESD22-A115CA<br>JESD22-C101|> ±100 mA or > 1.5×V(max) on all pins<br>> ±2000 V on all pins<br>> ±200 V on all pins<br>> ±500 V on all pins|



## **Part Ordering Information** 

||||||**• LYTSwitch-1 Product Family**|
|---|---|---|---|---|---|
||||||**• Series Number**|
||||||**• Package Identifer**|
||||||D<br> SO-8|
||||||**• Tape & Reel and Other Options**|
||||||Blank<br>Standard Confguration of 100 pcs.|
|**LYT**|**1604**|**D**|**-**|**TL**|TL<br>Tape & Reel, 2500 pcs min/mult.|



**8** 

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**LYT1402-1604** 

## Notes 

**9** 

Rev. A 06/16 

www.power.com 

|**Revision**|**Notes**|**Date**|
|---|---|---|
|A|Code A.|06/16|



## **For the latest updates, visit our website: www.power.com** 

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## **Patent Information** 

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2. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. 

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