V78-500-SMT データシートの表示（PDF） - CUI INC
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V78-500-SMT Datasheet PDF : 8 Pages
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CUI Inc │ SERIES: V78-500-SMT │ DESCRIPTION: NON-ISOLATED SWITCHING REGULATOR
date 01/26/2016 │ page 5 of 8
OUTPUT TRIMMING
Part Name
Vo nom
V7803-500-SMT
3.3V
V7805-500-SMT
5.0V
V7812-500-SMT
12V
V7815-500-SMT
15V
Trim Down
R 1(KΩ )
=
6 1 *Vo - 7 5 . 1 0
3 . 3 -Vo
= 61*Vo-91.52
5.0 -Vo
=
7 1 *Vo - 2 8 7 . 0 2
12-Vo
= 6 6*Vo -26 9.37
15-Vo
Trim Up
R2(KΩ )
7 5 . 1 0 - 1 0 *Vo
= Vo -3.3
= 91.52-10*Vo
Vo -5.0
=
2
8
7
.02-20*
Vo -1 2
Vo
= 269.37-15*Vo
Vo -1 5
To trim the output of the device input the desired output voltage (Vo) into the proper equation.
R1 trims the output voltage down and R2 trims the voltage up. If not using the trim feature
R1 and R2 are left open. Make sure that the desired output voltage is within the trim range.
TEST CIRCUIT
1) Efficiency and Output Voltage Ripple Test
25.4mm
25.4mm
12.7mm
Vin
C1
GND
1
DC/DC
Converter
5
79
6
C5
470pF
Ceramic
C2 C3
+ Vo u t
Copper strip
1 F 10 F
Cer amic Ta ntalum Scope
Copper strip
2) Start-up and Load Transient Response Test
50.8 mm
Vin
C1
GND
1
DC/DC
Converter
5
Copper strip
79
6
C2 C3
C5
470pF
Ceramic
Copper strip
+Vout
Scope
cui.com
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