UNDER VOLTAGE LOCKOUT

OUTPUT VOLTAGE TRIMMING

continued on next page

DC/DC Converter

RPA100H-RUW

Series

PB-3

REV.: 0/2017

www.recom-power.com

TRIM

-Sense

TRIM

+Sense

TRIM DOWN

TRIM UP

Practical Example:

Trim Up:

Trim down:

Vout = 12V,

DVout = +10% (13.2V)

Vout = 24V,

DVout = -8% (22V)

Trim Down:

Trim Calculation

Trim Up:

12Vout

24Vout

Vout

= Output Voltage

DVout = Output Voltage Change in %

R1

= trim up resistor

R2

= trim down resistor

R

45 +40)kΩ

DVout

R

45 + 40)kΩ = 490kΩ

0.1

R

95 +90)kΩ

DVout

R

5.11 -10.22)kΩ

DVout

Input Voltage [VDC]

100

0

0.1s

continuous operation

1s

14.4

16.8

137.5

156

R1

-Vin

+Vin

+Vout

-Vout

CTRL

C1

Q1

R1

Ext. Cap.

+Vout

-Vout

-Vin

Hold Up Circuit

D1

C1

C2

+Vin

+Vout

-Vout

UVLO

-Vin

R1

Input Voltage Range

Output Voltage Trimming

RPA100H-RUW converters offer the feature of trimming the output voltage over a certain range around the nominal value by using external

trim resistors. The values for trim resistors shown in trim tables below are according to standard E96 values; therefore, the specified voltage

may slightly vary.

The RPA100H series has an adjustable under voltage lockout which will shut down the

converter according to following settings.

Input Voltage [VDC]

24

36

48

72

110

Turn Off Threshold [VDC]

14

20.6

27.5

40

64

Turn On Threshold [VDC]

16

24

32

46.5

74

Resistor R1 [k

Ω]

open

27.4

13

6.81

3.57

Continuous full power operation is certified between 16.8V and 137.5V,

including full load start-up.

Once running, the converter will operate for short periods of time over

an extended input voltage range down to 14.4V and up to 156V, thus

covering all EN50155 under-voltage and over-voltage transient

conditions.

R

5.11 -10.22)kΩ = 53.65kΩ

0.08