VSK-S20-24U データシートの表示（PDF） - CUI INC
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VSK-S20-24U Datasheet PDF : 7 Pages
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CUI Inc │ SERIES: VSK-S20 │ DESCRIPTION: AC-DC POWER SUPPLY
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
R1
Vre f R3
Trim
R1
Vref R3
RT
Trim
R2 RT
R 2
0V
0V
Tr im up
Tr im down
up: RT=
aR 2
R2-a
-R3
down : RT=
aR 1
R1-a
-R3
Vref
a =Vo’ - Vref R1
a =Vo’ - Vref
Vref
R2
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
Table 3
Vout
(Vdc)
3.3
5
9
12
15
24
R1
(kΩ)
3.3
3.3
7.5
3.83
7.5
8.66
R2
(kΩ)
1.98
3.3
2.87
1
1.5
1
R3
(kΩ)
1
1
1
1
1
1
Vref
(V)
1.24
2.5
2.5
2.5
2.5
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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