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date 02/25/2015
page 1 of 7
SERIES: VSK-S25-T │ DESCRIPTION: AC-DC POWER SUPPLY
MODEL output
voltage
output
current
output
power
ripple
and noise1
efciency
(Vdc)
max
(A)
max
(W)
typ
(mVp-p)
typ
(%)
VSK-S25-5U-T 5 4.1 20.5 50 74
VSK-S25-9U-T 9 2.5 22.5 50 78
VSK-S25-12U-T 12 2.1 25 50 82
VSK-S25-15U-T 15 1.6 25 50 83
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.
FEATURES
• up to 25W continuous power
• compact chassis mount design
• universal input (85~264 Vac / 120~370 Vdc)
• single, regulated output from 5~48 Vdc
• over voltage, over current, and short circuit protections
• UL/cUL safety approvals
• efficiency up to 87%
PART NUMBER KEY
VSK-S25 - XXU - T
Base Number Output Voltage
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date 02/25/2015 │ page 2 of 7CUI Inc │ SERIES: VSK-S25-T │ DESCRIPTION: AC-DC POWER SUPPLY
INPUT
parameter conditions/description min typ max units
voltage 85
120
264
370
Vac
Vdc
frequency 47 63 Hz
current at 115 Vac
at 230 Vac
600
340
mA
mA
inrush current at 115 Vac
at 230 Vac
16
30
A
A
leakage current at 230 Vac, 50 Hz (RMS) 0.3 mA
input fuse 3.15 A/250 V, slow-blow type (included on chassis)
OUTPUT
parameter conditions/description min typ max units
capacitive load
5 Vdc output model
9 Vdc output model
12 Vdc output model
15 Vdc output model
24 Vdc output model
48 Vdc output model
12,240
5,600
5,400
2,400
1,440
800
μF
μF
μF
μF
μF
μF
line regulation at full load ±0.5 %
load regulation at 10~100% load ±1 %
voltage set accuracy ±2 %
adjustability ±10 %
hold-up time at 115 Vac
at 230 Vac
15
80
ms
ms
switching frequency 65 kHz
temperature coefcient ±0.02 %/°C
PROTECTIONS
parameter conditions/description min typ max units
over current protection auto restart 110 %
short circuit protection continuous, auto restart
over voltage protection
5 Vdc output model
9 Vdc output model
12 Vdc output model
15 Vdc output model
24 Vdc output model
48 Vdc output model
7.5
12
20
20
30
60
Vdc
Vdc
Vdc
Vdc
Vdc
Vdc
SAFETY & COMPLIANCE
parameter conditions/description min typ max units
isolation voltage input to output for 1 minute 3,000 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 gure 2)
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date 02/25/2015 │ page 3 of 7CUI Inc │ SERIES: VSK-S25-T │ DESCRIPTION: AC-DC POWER SUPPLY
SAFETY & COMPLIANCE (CONTINUED)
parameter conditions/description min typ max units
surge IEC/EN61000-4-5 Class B, ±1 kV/±2 kV
IEC/EN61000-4-5 Class B, ±2 kV/±4 kV (external circuit required, see gure 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
~
~
~
~~
~
100
80
60
20
Ambient Temperature (°C)
Load (%)
-10-40
43.75
25
-5 54535 55 7065 75
Safe operating area
~
~
100
60
40
20
Input Voltage (Vac)
Load (%)
85
75
95 100 105 115 125 235 245240 255 264
Safe operating area
~
~
~
~
100
60
40
20
Input Voltage (Vdc)
Load (%)
100
75
121 320 353
Safe operating area
40
load vs. ambient temperature
(at 110~240 Vac)
load vs. input voltage (Vac)
(at 25°C) load vs. input voltage (Vdc)
(at 25°C)
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date 02/25/2015 │ page 4 of 7CUI Inc │ SERIES: VSK-S25-T │ DESCRIPTION: AC-DC POWER SUPPLY
>@
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>@
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Top View
Side View
units: mm[inches]
tolerance: ±0.50[±0.020]
wire range: 24~12 AWG
PIN CONNECTIONS
PIN FUNCTION
1 GND
2 AC(N)
3 AC(L)
4-Vo
5 NC
6 TRIM
7 NC
8+Vo
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
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date 02/25/2015 │ page 5 of 7CUI Inc │ SERIES: VSK-S25-T │ DESCRIPTION: AC-DC POWER SUPPLY
AC
(L)+Vo
-Vo
AC(L)
AC(N)
AC(N)
C1 C2 TVS
LO
AD
FUSE
ACDC
MOV1
NTC
TYPICAL APPLICATION CIRCUIT
Recommended External Circuit Components
MODEL FUSE1NTC MOV1 C1 C2 TVS
VSK-S25-5U-T 3.15A/250V 5D-9 S14K350 0.1µF 330μF SMBJ7.0A
VSK-S25-9U-T 3.15A/250V 5D-9 S14K350 0.1µF 330μF SMBJ12A
VSK-S25-12U-T 3.15A/250V 5D-9 S14K350 0.1µF 330μF SMBJ20A
VSK-S25-15U-T 3.15A/250V 5D-9 S14K350 0.1µF 330μF SMBJ20A
VSK-S25-24U-T 3.15A/250V 5D-9 S14K350 0.1µF 120μF SMBJ30A
VSK-S25-48U-T 3.15A/250V 5D-9 S14K350 0.1µF 68μF SMBJ64A
Recommended External Circuit Components
MOV1 S14K350
CY1, CY2 1000pF/400Vac
CX 0.1μF/275Vac
LCM 10mH
LDM 5μH
EMC RECOMMENDED CIRCUIT
Note: Also refer to Table 1
Figure 1
Table 1
Figure 2
Table 2
ACDC
AC
(N)
AC(L)
LCM
MOV1 CX
CY1
CY2
FUSE
AC(N)
AC(L)
+Vo
-Vo
+
LDM
C1 C2 TVS1 RL
Note: 1. Fuse included on chassis
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date 02/25/2015 │ page 6 of 7CUI Inc │ SERIES: VSK-S25-T │ DESCRIPTION: AC-DC POWER SUPPLY
APPLICATION NOTES
1. Output voltage trimming
Leave open if not used.
Application Circuit for Trim pin
(part in broken line is the interior of models) Formula for Trim Resistor
Note: Value for R1, R2, R3, and Vref refer to Table 3
RT: Trim Resistor
a: User-dened parameter, no actual meanings
Vo': The trim up/down voltage
Figure 3
Table 3
Vout
(Vdc)
R1
(kΩ)
R2
(kΩ)
R3
(kΩ)
Vref
(V)
5 3.3 3.3 1 2.5
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
48 68 3.73 1 2.5
+Vo
0V
R
2
R
1
R
3
V
re f
R
T
Trim
0V
R
2
R
1
R
3
V
ref
R
T
Tr
im
+Vo
Tr im up
Tr im down
a
-a
R
2
aR 1
R2
-a
R1-R3
-R3
:a=
Vref
Vref
Vo’ - Vref
Vo’ - Vref
R
1
R=
T
:a= R
2
R=
T
up
dow
n
Notes: 1. Output ltering 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 lter high frequency noise. TVS is
recommended component to protect post-circuits (when converter fails).
2.
All specications measured at Ta=25C, humidity <75%, nominal input voltage, and rated output load, unless otherwise specied.
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date 02/25/2015 │ page 7 of 7CUI Inc │ SERIES: VSK-S25-T │ DESCRIPTION: AC-DC POWER SUPPLY
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.
Headquarters
20050 SW 112th Ave.
Tualatin, OR 97062
800.275.4899
Fax 503.612.2383
cui.com
techsupport@cui.com
rev. description date
1.0 initial release 09/06/2012
1.01 updated spec 01/08/2014
1.02 updated operating and storage temperatures, updated spec 02/25/2015
The revision history provided is for informational purposes only and is believed to be accurate.
REVISION HISTORY
For more information, please visit the product page.
