VSK-S3-3R3U

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## **SERIES:** VSK-S3 **DESCRIPTION:** AC-DC POWER SUPPLY **│** 

## **FEATURES** 

- up to 3 W continuous power 

- compact board mount design 

- universal input (85~264 Vac / 110~370 Vdc) 

- single output from 3.3~24 V 

- over voltage, over temperature, and short circuit protections 

- UL/cUL safety approvals 

- efficiency up to 78% 

|**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-S3-3R3U|3.3|0.7|2.3|30|63|
|VSK-S3-5U*|5|0.6|3|30|72|
|VSK-S3-9U|9|0.33|3|30|74|
|VSK-S3-12U|12|0.25|3|30|76|
|VSK-S3-15U*|15|0.2|3|30|76|
|VSK-S3-24U*|24|0.125|3|30|78|



- Notes: 1. Ripple and noise measured at 20 MHz bandwidth 

2. * Discontinued model. 

## **PART NUMBER KEY** 

## **VSK-S3 - XXU** 

Base Number 

Output Voltage 

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**CUI Inc │ SERIES:** VSK-S3 **│ DESCRIPTION:** AC-DC POWER SUPPLY 

**date** 01/11/2024 **│ page** 2 of 5 

## **INPUT** 

|**INPUT**||||||
|---|---|---|---|---|---|
|**parameter**|**conditions/description**|**min**|**typ**|**max**|**units**|
|voltage||85<br>110||264<br>370|Vac<br>Vdc|
|frequency||47||440|Hz|
|current|at 110 Vac<br>at 230 Vac||65<br>30||mA<br>mA|
|inrush current|at 110 Vac<br>at 230 Vac||10<br>20||A<br>A|
|external input fuse<br>(recommended)|slow blow, 250 V||0.5||A|
|**OUTPUT**||||||
|**parameter**|**conditions/description**|**min**|**typ**|**max**|**units**|
|line regulation|||±0.5||%|
|load regulation|10 ~ 100%||±1||%|
|temperature coefcient|||0.02||%/°C|
|hold-up time|at 230 Vac||50||ms|
|voltage accuracy|3.3 V model<br>all other models||±3<br>±2||%<br>%|
|switching frequency|||100||kHz|
|**PROTECTIONS**||||||
|**parameter**|**conditions/description**|**min**|**typ**|**max**|**units**|
|over voltage protection|chip lock up|||||
|short circuit protection|auto recovery with no damage from a short on any output|||||
|over temperature protection||||150|°C|
|**SAFETY & COMPLIANCE**||||||
|**parameter**|**conditions/description**|**min**|**typ**|**max**|**units**|
|isolation voltage|primary to secondary (for 1 minute)|3,000|||Vac|
|safety approvals|UL 60950-1|||||
|safety class|class II|||||
|EMI/EMC|EN 55022 (level A), IEC/EN 61000-4-2 (level 4, 8kV/15kV), IEC/EN<br>(level 3, 2kV), IEC/EN 61000-4-5 (level 3, 1kV/2kV)||61000-4-3,|IEC/EN|61000-4-4|
|MTBF|25°C|300,000|||hrs|
|RoHS|2011/65/EU|||||



## **ENVIRONMENTAL** 

|**ENVIRONMENTAL**||||||
|---|---|---|---|---|---|
|**parameter**|**conditions/description**|**min**|**typ**|**max**|**units**|
|operating temperature||-25||70|°C|
|storage temperature||-40||105|°C|
|case temperature||||95|°C|
|operating humidity|non-condensing|||95|%|



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**date** 01/11/2024 **│ page** 3 of 5 

## **DERATING CURVES** 

## **MECHANICAL** 

|**MECHANICAL**||||||
|---|---|---|---|---|---|
|**parameter**|**conditions/description**|**min**|**typ**|**max**|**units**|
|dimensions|1.457 x 0.908 x 0.591 (37.0 x 23.0 x 15.0 mm)||||inch|
|case material|UL94V-0|||||
|weight|||25||g|



## **MECHANICAL DRAWING** 

**==> picture [534 x 385] intentionally omitted <==**

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**CUI Inc │ SERIES:** VSK-S3 **│ DESCRIPTION:** AC-DC POWER SUPPLY 

**date** 01/11/2024 **│ page** 4 of 5 

## **TYPICAL APPLICATION CIRCUIT** 

## **Figure 1** 

## **Figure 2** 

## **VSK-S3 EMC Filtering Circuit** 

## **(Unit: µF)** 

## **EXTERNAL CAPACITORS TYPICAL VALUE** 

|**EXTERNAL CAPACITORS TYPICAL VALUE(Unit: µF)Unit: µF)µF)F))**|**EXTERNAL CAPACITORS TYPICAL VALUE(Unit: µF)Unit: µF)µF)F))**|**EXTERNAL CAPACITORS TYPICAL VALUE(Unit: µF)Unit: µF)µF)F))**|**EXTERNAL CAPACITORS TYPICAL VALUE(Unit: µF)Unit: µF)µF)F))**|**EXTERNAL CAPACITORS TYPICAL VALUE(Unit: µF)Unit: µF)µF)F))**|
|---|---|---|---|---|
|MODEL|C1|C2|C3|TVS|
|VSK-S3-3R3U|150|0.1|4.7/400V|P4KE6.8A|
|VSK-S3-5U|150|0.1|4.7/400V|P4KE6.8A|
|VSK-S3-9U|150|0.1|4.7/400V|P4KE12A|
|VSK-S3-12U|150|0.1|4.7/400V|P4KE20A|
|VSK-S3-15U|150|0.1|4.7/400V|P4KE20A|
|VSK-S3-24U|150|0.1|4.7/400V|P4KE30A|



- Notes: 1. Output filtering capacitors C1, C3 is electrolytic capacitors, 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 apacitor should be 80% or above. C2, C4 is ceramic capacitors , it is used to filter high frequency noise. TVS is a recommended component to protect post-circuits (when converter fails). 

2. MOV is required for VSK-S3 models. Model: 471KD05, it is used to protect the device under surge. 

3. It is recommended to connect FUSE, the parameter is 0.5A/250V slow blow. External input NTC is recommended to use D -14 or 10Ω/2W wire-round resistor. 

4. If EMC performance is required, recommended to add “EMC filter” at the input end(see figure 2) C6:X capacitor, recommended parameter 0.1uF/275V; C7,C8:Y capacitor, recommended parameter 

- 220pF/275V; NF: common model choke, recommended inductance is about 10mH-30mH. 

5. Terminals 22 and 26 are internal rectification and filtering terminals. To protect the models further, it is recommended to connect an electrolytic capacitor C3 (it is recommended to be 4.7uF/400V). If operation voltage of the module is between 160~264VAC, C3 can be removed. 

1. All specifications measured at Ta=25°C, humidity <75%, rated input voltage, and rated output load, unless otherwise specified. 

Note: 

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**date** 01/11/2024 **│ page** 5 of 5 

## **REVISION HISTORY** 

|**rev.**|**description**|**date**|
|---|---|---|
|1.0|initial release|02/27/2009|
|1.01|new template applied|04/10/2012|
|1.02|V-Infnitybrandingremoved|08/15/2012|
|1.03|updated spec|03/31/2014|
|1.04|companylogo update|10/30/2020|
|1.05|UKCA mark added, deratingcurves and circuit fgures updated|06/01/2022|
|1.06|discontinued models VSK-S3-5U, VSK-S3-15U & VSK-S3-24U|01/11/2024|



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

**==> picture [119 x 38] intentionally omitted <==**

**Headquarters** 20050 SW 112th Ave. Fax 503.612.2383 Tualatin, OR 97062 **cui** .com **800.275.4899** techsupport@cui.com 

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.