VSK-S25-5U-T

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**date** 06/11/2015 **page** 1 of 7 

## **SERIES:** VSK-S25-T **DESCRIPTION:** AC-DC POWER SUPPLY **│** 

## **FEATURES** 

- up to 25W continuous power 

- compact chassis mount design 

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

- single, regulated output from 5~48 Vdc 

- over voltage, over current, and short circuit protections 

- UL/cUL safety approvals 

- efficiency up to 87% 

|**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-S25-5U-T|5|4.1|20.5|50|79|
|VSK-S25-9U-T|9|2.5|22.5|50|81|
|VSK-S25-12U-T|12|2.1|25|50|83|
|VSK-S25-15U-T|15|1.6|25|50|84|
|VSK-S25-24U-T|24|1.1|25|50|85|
|VSK-S25-48U-T|48|0.5|25|50|87|



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-S25 - XXU - T** ~~J~~ o\ Base Number 

Output Voltage 

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**date** 06/11/2015 **│ page** 2 of 7 

|**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 (included on chassis)||
|**OUTPUT**||
|**parameter**<br>**conditions/description**<br>**min**<br>**typ**<br>**max**<br>**units**||
|capacitive load<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 Vdc output model<br>12,000<br>5,600<br>5,400<br>2,400<br>1,400<br>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>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 Vdc output model<br>7.5<br>12<br>20<br>20<br>30<br>60<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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**date** 06/11/2015 **│ page** 3 of 7 

## **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<br>Safe operating area Safe operating area<br>40 40 40<br>20 20 20<br>-40 -10 50 70 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>


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**CUI Inc │ SERIES:** VSK-S25-T **│ DESCRIPTION:** AC-DC POWER SUPPLY 

**date** 06/11/2015 **│ page** 4 of 7 

## **MECHANICAL** 

|**MECHANICAL**||||||
|---|---|---|---|---|---|
|**parameter**|**conditions/description**|**min**|**typ**|**max**|**units**|
|dimensions|96.10 x 54.00 x 32.00 (3.783 x 2.126 x 1.259 inch)||||mm|
|case material|UL94V-0|||||
|weight|||170||g|
|cooling|convection cooling|||||



## **MECHANICAL DRAWING** 

units: mm[inches] tolerance: ±0.50[±0.020] 

wire range: 24~12 AWG 

|**PIN CONNECTIONS**<br>(° |<br>|
|---|
|PIN<br>FUNCTION<br>_|
|1<br>GND<br>2<br>AC(N)<br>3<br>AC(L)<br>4<br>-Vo<br>5<br>NC<br>~~eeee~~<br>(2<br>~~To~~<br>~~P|~~<br>~~a~~|
|Top View<br>6<br>TRIM<br>7<br>NC|
|8<br>+Vo|



## Side View 

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**CUI Inc │ SERIES:** VSK-S25-T **│ DESCRIPTION:** AC-DC POWER SUPPLY 

**date** 06/11/2015 **│ page** 5 of 7 

## **TYPICAL APPLICATION CIRCUIT** 

**Figure 1** 

**==> picture [400 x 90] intentionally omitted <==**

**----- Start of picture text -----**<br>
FUSE<br>AC(L) AC(L) +Vo C1 C2 TVS<br>MOV1 ACDC<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|FUSE1|MOV1|C1|C2|TVS|
|VSK-S25-5U-T|3.15A/250V|S14K350|1µF|330μF|SMBJ7.0A|
|VSK-S25-9U-T|3.15A/250V|S14K350|1µF|330μF|SMBJ12A|
|VSK-S25-12U-T|3.15A/250V|S14K350|1µF|330μF|SMBJ20A|
|VSK-S25-15U-T|3.15A/250V|S14K350|1µF|330μF|SMBJ20A|
|VSK-S25-24U-T|3.15A/250V|S14K350|1µF|120μF|SMBJ30A|
|VSK-S25-48U-T|3.15A/250V|S14K350|1µF|68μF|SMBJ64A|



Note: 1. Fuse included on chassis 

## **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** 

|Recommended External Circuit Components|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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**date** 06/11/2015 **│ page** 6 of 7 

## **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 

+Vo +Vo aR 2 Vref up: R T= R2-a -R3 a=Vo’ - Vref R 1 R1 down : R T= aRR1-a 1 -R3 a=VoVref’ - Vref R 2 R 3 R1 RT Vre f Trim R3 V ref Trim R 2 R T Note:   Value for R1, R2, R3, and Vref refer to Table 3 R2 R                   a: User-defined parameter, no actual meanings T: Trim Resistor Vo': The trim up/down voltage 0V 0V Trim up Trim down Vout R1 R2 R3 Vref (Vdc) (kΩ) (kΩ) (kΩ) (V) 5 3.3 3.3 1 2.5 9 7.5 2.87 1 2.5 **Table 3** 12 3.83 1 1 2.5 15 7.5 1.5 1 2.5 24 8.66 1 1 2.5 48 68 3.73 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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**CUI Inc │ SERIES:** VSK-S25-T **│ DESCRIPTION:** AC-DC POWER SUPPLY 

**date** 06/11/2015 **│ page** 7 of 7 

## **REVISION HISTORY** 

|**rev.**|**description**|**date**|
|---|---|---|
|1.0|initial release|09/06/2012|
|1.01|updated spec|01/08/2014|
|1.02|updated operatingand storage temperatures, updated spec|02/25/2015|
|1.03|updated spec|06/11/2015|



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

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CUI offers a two (2) year limited warranty.  Complete warranty information is listed on our website. CUI reserves the right to make changes to the product at any time without notice.  Information provided by CUI is believed to be accurate and reliable.  However, no responsibility is assumed by CUI for its use, nor for any infringements of patents or other rights of third parties which may result from its use. 

CUI products are not authorized or warranted for use as critical components in equipment that requires an extremely high level of reliability.  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.