Datasheet

cui.com
date 01/26/2016 │ page 5 of 8CUI Inc │ SERIES: V78-500-SMT │ DESCRIPTION: NON-ISOLATED SWITCHING REGULATOR
OUTPUT TRIMMING
V7815-500-SMT
V7812-500-SMT
V7805-500-SMT
V7803-500-SMT
Part Name
Vo nom
3.3V
5.0V
12V
15V
Trim Down Trim Up
R2(K )ΩR1(KΩ )
75.10-10*Vo
Vo-3.3
61*Vo-75.10
3.3-Vo
269.37-15*Vo
Vo-15
66*Vo-269.37
15-Vo
=
91.52-10*Vo
Vo-5.0
=
287.02-20*Vo
Vo-12
=
=
=
61*Vo-91.52
5.0-Vo
=
71*Vo-287.02
12-Vo
=
=
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 OutputVoltage Ripple Test
Scope
Ceramic
7 9
5
Vin
GND
+Vout
C2
C1
25.4mm
1
2.54mm
DC/DC
Converter
470pF
6
C5
C3
25.4mm
12.7mm
1F
10 F
Copperstrip
Copperstrip
Ta ntalum
Ceramic
Load
2)
Start-up and Load TransientResponseTest
Scope
Ceramic
7 9
5
Vin
GND
+Vout
C2
C1
50.8 mm
1
2 .54 mm
DC/DC
Converter
470pF
6
C5
C3
Copper strip
Copper strip
Load
For more information, please visit the product page.