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VRB_LD-30WR2

2013.12.11-A/3

Page7 of8

VRB_LD-30WHR2A4S DIN-RAIL MOUNTING OUTLINE DIMENSIONS

DIN-rail modules are fitting to TS35 rails

Footprint Details

Pin

1

2

3

4

5

6

Function

Ctrl

GND

Vin

Trim

0V

+Vo

PACKAGE DIAGRAM

Special Package Series（A2S/A4S）

TEST CONFIGURATIONS

Input Reflected-Ripple Current Test Setup

Input reflected-ripple current is measured with an inductor Lin and Capacitor Cin to simulate source impedance.

DC

Cin

Lin

DC

Load

Oscilloscope

Current

Probe

Lin(4.7

µH)

Cin(220

µF, ESR < 1.0Ω at 100 KHz)

Trim APPLICATION& TRIM RESISTANCE

Application circuit for Trim (Part in broken line is the interior of models)

0V

Trim

+ Vo

0V

Trim

+Vo

Trim up

Trim down

Formula for resistance of Trim

up:

a=

Vref

Vo

’-Vref

R=

T

R -a

2

down:

a=

Vref

Vo

’-Vref

R=

T

R -a

1