TECHNICAL DATASHEET

In Development

HVIB Series

Wall Industries, Inc. 5 Watson Brook Road Exeter, NH 03833

12/27/2011

Page 6 of 11

Output Voltage Trim

The following information is provided to allow quick calculation of the trim resistor value for a desired output

voltage. The general procedure for calculating a trim resistor is as follows:

1. Determine the desired output voltage deviation %.

2. To trim down, solve for resistor value using the “Rtlow” equation.

3. To trim up, solve for resistor value using the “Rthi” equation.

4.

Solved resistor values are in K ohms.

Notes:

1. Maximum trim range is ±10%. This includes remote sense drops if applicable.

2. Output current is limited to specified current when trimming down.

3. Output power is limited to specified power when trimming up.

4. Trim resistors should be placed close to the module.

5.

If the trim function is not used, it is advised to leave the trim pin floating / not connected.



















2

.

10

%

510

Rtlow



























2

.

10

%

510

%

2225

.

1

%)

100

(

o

V

1

.

5

Rthi

Figure 3

Figure 4