VSK-S20-15U

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## **SERIES:** VSK-S20 **DESCRIPTION:** AC-DC POWER SUPPLY **│** 

## **FEATURES** 

- up to 20W continuous power 

- compact board mount design 

- universal input (85~264 Vac / 100~370 Vdc) 

- single output from 3.3~24 Vdc 

- over voltage, over temperature, and short circuit protections 

- UL/cUL safety approvals 

- efficiency up to 85% 

|**MODEL**|**output**<br>**voltage**|**output**<br>**current**|**output**<br>**power**|**ripple**<br>**and noise1**|**efficiency**|
|---|---|---|---|---|---|
|||**max**|**max**|**typ**|**typ**|
||(Vdc)|(A)|(W)|(mVp-p)|(%)|
|VSK-S20-3R3U|3.3|4.1|13.5|50|74|
|VSK-S20-5U|5|3.5|17.5|50|78|
|VSK-S20-9U|9|2.1|20|50|80|
|VSK-S20-12U|12|1.6|20|50|82|
|VSK-S20-15U|15|1.3|20|50|83|
|VSK-S20-24U|24|0.85|20|50|85|



Notes: 1. Ripple and noise are measured at 20 MHz BW by “parallel cable” method with 1 uF ceramic and 10 uF electrolytic capacitors on the output. 

## **PART NUMBER KEY** 

## **VSK-S20 - XXU** 

Base Number 

Output Voltage 

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|**INPUT**|**INPUT**|
|---|---|
|**parameter**<br>**conditions/description**<br>**min**<br>**typ**<br>**max**<br>**units**||
|voltage<br>85<br>100<br>264<br>370<br>Vac<br>Vdc||
|frequency<br>47<br>63<br>Hz||
|current<br>at 115 Vac<br>at 230 Vac<br>600<br>340<br>mA<br>mA||
|inrush current<br>at 115 Vac<br>at 230 Vac<br>16<br>30<br>A<br>A||
|leakage current<br>at 230 Vac, 50 Hz (RMS)<br>0.1<br>mA||
|input fuse<br>3.15 A/250 V, slow-blow type (external)||
|**OUTPUT**||
|**parameter**<br>**conditions/description**<br>**min**<br>**typ**<br>**max**<br>**units**||
|capacitive load<br>3.3 Vdc output model<br>5 Vdc output model<br>9 Vdc output model<br>12 Vdc output model<br>15 Vdc output model<br>24 Vdc output model<br>48,000<br>12,000<br>7,200<br>5,400<br>2,700<br>1,800<br>μF<br>μF<br>μF<br>μF<br>μF<br>μF||
|line regulation<br>at full load<br>±0.5<br>%||
|load regulation<br>at 10~100% load<br>±1<br>%||
|voltage set accuracy<br>±2<br>%||
|adjustability<br>±10<br>%||
|hold-up time<br>at 115 Vac<br>at 230 Vac<br>15<br>80<br>ms<br>ms||
|switching frequency<br>65<br>kHz||
|temperature coeffcient<br>±0.02<br>%/°C||
|**PROTECTIONS**||
|**parameter**<br>**conditions/description**<br>**min**<br>**typ**<br>**max**<br>**units**||
|over current protection<br>auto restart<br>110<br>%||
|short circuit protection<br>continuous, auto restart||
|over voltage protection<br>3.3 Vdc output model<br>5 Vdc output model<br>9 Vdc output model<br>12 Vdc output model<br>15 Vdc output model<br>24 Vdc output model<br>7.5<br>7.5<br>12<br>20<br>20<br>30<br>Vdc<br>Vdc<br>Vdc<br>Vdc<br>Vdc<br>Vdc||
|**SAFETY & COMPLIANCE**||
|**parameter**|**conditions/description**<br>**min**<br>**typ**<br>**max**<br>**units**|
|isolation voltage|input to output for 1 minute<br>input to ground for 1 minute<br>3,000<br>2,000<br>Vac<br>Vac|
|safety approvals|UL60950-1, CE|
|safety class|class I|
|conducted emissions|CISPR22/EN55022, Class B|
|radiated emissions|CISPR22/EN55022, Class B|
|ESD|IEC/EN61000-4-2 Class B, contact ±6 kV/air ±8 kV|
|radiated immunity|IEC/EN61000-4-3 Class A, 10V/m|
|EFT/burst|IEC/EN61000-4-4 Class B, ±2 kV|
||IEC/EN61000-4-4 Class B, ±4 kV (external circuit required, see fgure 2)|



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## **SAFETY & COMPLIANCE (CONTINUED)** 

|**parameter**|**conditions/description**|**min**|**typ**|**max**|**units**|
|---|---|---|---|---|---|
|surge|IEC/EN61000-4-5 Class B, ±1 kV/±2 kV<br>IEC/EN61000-4-5 Class B, ±2 kV/±4 kV (external circuit required,||see fgure 2)|||
|conducted immunity|IEC/EN61000-4-6 Class A, 10 Vr.m.s|||||
|PFM|IEC/EN61000-4-8 Class A, 10 A/m|||||
|voltage dips & interruptions|IEC/EN61000-4-11 Class B, 0%-70%|||||
|MTBF|as per MIL-HDBK-217F at 25°C|300,000|||hrs|
|RoHS|2011/65/EU|||||
|**ENVIRONMENTAL**||||||
|**parameter**|**conditions/description**|**min**|**typ**|**max**|**units**|
|operating temperature|see derating curves|-40||70|°C|
|storage temperature||-40||105|°C|
|storage humidity|non-condensing|||95|%|



## **DERATING CURVES** 

**==> picture [562 x 120] intentionally omitted <==**

**----- Start of picture text -----**<br>
load vs. ambient temperature load vs. input voltage (Vac) load vs. input voltage (Vdc)<br>(at 100~240 Vac) (at 25°C) (at 25°C)<br>100 100 100<br>80<br>75 75<br>60 60 60<br>Safe operating area Safe operating area Safe operating area<br>40 40 40<br>20 20 20<br>-40 -10 -5 5 25 35 45 55 65 70 75 85 95 100 105 115 125 235 240245 255 264 100 120 340 370<br>Ambient Temperature (°C) Input Voltage (Vac) Input Voltage (Vdc)<br>~~ ~~ ~~<br>Load (%) Load (%) Load (%)<br>~~ ~~ ~~<br>**----- End of picture text -----**<br>


## **SOLDERABILITY** 

|**parameter**|**conditions/description**|**min**|**typ**|**max**|**units**|
|---|---|---|---|---|---|
|hand soldering|for 3~5 seconds|350|360|370|°C|
|wave soldering|for 5~10 seconds (see wave soldering profle)|255|260|265|°C|



**==> picture [287 x 194] intentionally omitted <==**

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Peak Temp. 260°C Max.<br>250 Wave Soldering Time<br>4 Sec. Max.<br>200<br>10 Sec. Max.<br>150<br>100<br>50<br>0<br>Time (sec.)<br>Temperature (°C)<br>**----- End of picture text -----**<br>


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## **MECHANICAL** 

|**MECHANICAL**||||||
|---|---|---|---|---|---|
|**parameter**|**conditions/description**|**min**|**typ**|**max**|**units**|
|dimensions|70.0 x 48.0 x 23.5 (2.756 x 1.889 x 0.925 inch)||||mm|
|case material|UL94V-0|||||
|weight|||120||g|
|cooling|convection cooling|||||



## **MECHANICAL DRAWING** 

units: mm[inches] tolerance: ±0.50[±0.020] pin diameter: Ø1.00[0.039]±0.10[±0.004] 

|units: mm[inches]<br>|units: mm[inches]<br>|units: mm[inches]<br>|||||||||
|---|---|---|---|---|---|---|---|---|---|---|
|6.0 <br>tolerance: ±0.50[±0.020]<br>pin diameter: Ø1.00[0.039]±0.10[±0.004]<br>**PIN CONNECTIONS**<br>PIN<br>FUNCTION<br>1<br>GND<br>2<br>AC(N)<br>3<br>AC(L)<br>4<br>TRIM<br>5<br>-Vo<br>6<br>+Vo|||(TYP)<br> 0.236||||70.0 2.756|||23.5 0.925|
||||||||||||
|**PIN CONNECTIONS**|||||||||||
|PIN|FUNCTION||||||||||
|1|GND||||||||||
|2|AC(N)||||||||||
|3|AC(L)||||||||||
||||||||FRONT VIEW||||
|4|TRIM||||||||||
|5|-Vo||||||||||
|6|+Vo||||||||||



**==> picture [562 x 200] intentionally omitted <==**

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Ø1.50[Ø0.059]<br>4.0 0.157 62.0 2.441<br>1<br>4 3<br>5<br>6<br>20.0 0.787<br>48.0 1.889<br>2 2<br>23.0 0.905<br>5<br>6 5.75 0.226<br>4<br>1<br>3<br>4.0 0.157<br>Grid size: 2.54 x 2.54<br>(2 PLCS)<br>TOP VIEW BOTTOM VIEW<br>PCB LAYOUT<br>**----- End of picture text -----**<br>


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## **TYPICAL APPLICATION CIRCUIT** 

## **Figure 1** 

**==> picture [345 x 94] intentionally omitted <==**

**----- Start of picture text -----**<br>
FUSE<br>AC(L) AC(L) +Vo C1 C2 TVS1<br>MOV1 AC/DC<br>LOAD<br>AC(N) AC(N)<br>-Vo<br>**----- End of picture text -----**<br>


**Table 1** 

|**Table 1**|**Table 1**|**Table 1**|**Table 1**|**Table 1**|**Table 1**|
|---|---|---|---|---|---|
|||||||
|Recommended External Circuit Components||||||
|MODEL|FUSE|MOV1|C1|C2|TVS|
|VSK-S20-3R3U|3.15A/250V|S14K350|1µF|330μF|SMBJ7.0A|
|VSK-S20-5U|3.15A/250V|S14K350|1µF|330μF|SMBJ7.0A|
|VSK-S20-9U|3.15A/250V|S14K350|1µF|220μF|SMBJ12A|
|VSK-S20-12U|3.15A/250V|S14K350|1µF|220μF|SMBJ20A|
|VSK-S20-15U|3.15A/250V|S14K350|1µF|220μF|SMBJ20A|
|VSK-S20-24U|3.15A/250V|S14K350|1µF|220μF|SMBJ30A|



## **EMC RECOMMENDED CIRCUIT** 

## **Figure 2** 

**==> picture [418 x 116] intentionally omitted <==**

**----- Start of picture text -----**<br>
FUSE LDM LCM<br>C1 C2 TVS1 RL<br>AC(L) AC(L) +Vo<br>CY1<br>+<br>MOV1 CX ACDC<br>CY2<br>-Vo<br>AC(N) AC(N)<br>**----- End of picture text -----**<br>


## **Table 2** 

|**Table 2**|**Table 2**|
|---|---|
|Recommended External Circuit Components||
|MOV1|S14K350|
|CY1, CY2|1000pF/400Vac|
|CX|0.1μF/275Vac|
|LCM|10mH|
|LDM|4.7μH/2A|
|Note:<br>Also refer to Table 1||



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## **APPLICATION NOTES** 

1. **Output voltage trimming** Leave open if not used. 

## **Figure 3** 

Application Circuit for Trim pin (part in broken line is the interior of models) 

Formula for Trim Resistor 

**==> picture [215 x 132] intentionally omitted <==**

**----- Start of picture text -----**<br>
+Vo +Vo<br>R1<br>R 3 R1 RT<br>Vre f Trim R3<br>V ref Trim<br>R 2 R T<br>R2<br>0V 0V<br>Trim up Trim down<br>**----- End of picture text -----**<br>


**==> picture [172 x 36] intentionally omitted <==**

Note:   Value for R1, R2, R3, and Vref refer to Table 3 RT: Trim Resistor 

- a: User-defined parameter, no actual meanings 

Vo': The trim up/down voltage 

Vout R1 R2 R3 Vref (Vdc) (kΩ) (kΩ) (kΩ) (V) 3.3 3.3 1.98 1 1.24 5 3.3 3.3 1 2.5 **Table 3** 9 7.5 2.87 1 2.5 12 3.83 1 1 2.5 15 7.5 1.5 1 2.5 24 8.66 1 1 2.5 ~~-~~ 

Notes: 1. Output filtering capacitor C2 is an electrolytic capacitor, It is recommended to use high frequency and low impedance electrolytic capacitors. For capacitance and current of capacitor please refer to manufacture’s datasheet. Voltage derating of capacitor should be 80% or above. C1 is used to filter high frequency noise. TVS is recommended component to protect post-circuits (when converter fails). 2. All specifications measured at Ta=25C, humidity <75%, nominal input voltage, and rated output load, unless otherwise specified. 

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## **REVISION HISTORY** 

|**rev.**|**description**|**date**|
|---|---|---|
|1.0|initial release|07/26/2011|
|1.01|new template applied|03/07/2012|
|1.02|V-Infnitybrandingremoved|08/21/2012|
|1.03|updated spec|01/08/2014|
|1.04|updated operatingand storage temperatures, updated spec|06/11/2015|



The revision history provided is for informational purposes only and is believed to be accurate. 

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