Technical Reference Notes

AEO_ALO04/12/20/25x48 Series

MODEL: AEO_ALO04/12/20/25x48 SERIES

SHEET 7 OF 26

AUGUST 25, 2005 - REVISION G

+Vin

-Vin

Enable

-Vout

+Vout

-Sense

+Sense

Vadj

Rload

Radj_up

Figure 3. External resistor configuration to increase the outputs

+Vin

-Vin

Enable

-Vout

+Vout

-Sense

+Sense

Vadj

Rload

Radj_down

Figure 4. External resistor configuration to increase the outputs

Basic Operation and Features

INPUT UNDER VOLTAGE LOCKOUT

To prevent any instability to the converter, which may affect the end system, the converter have been designed to turn-on once

34VDC

OUTPUT VOLTAGE ADJUST/TRIM

The converter comes with a TRIM pin (PIN 6), which is used to adjust the output by as much as 90% to 110% of its set point.

This is achieved by connecting an external resistor as described below.

should be connected between TRIM PIN (Pin6) and

+SENSE PIN (Pin 7). Please refer to Equation (1) for the

required external resistance and output adjust

relationship.

Equation (1a): 1.5V to 12V

Equation (1b): 1.2V

should be connected between TRIM pin (Pin 6) and

-SENSE PIN (Pin 5). Please refer to Equation (2) for the

required external resistance and output adjust

relationship.

Equation (2):

Where:

∆% = percent change in output voltage

Radj_down

510

∆%

10.2

−









k

Ω

⋅

Radj_up

5.1 Voset

×

100

∆%

+

(

)

×

0.6

∆%

×

510

∆%

−

10.2

−













=ΚΩ

Radj_up

5.1 Voset

×

100

∆%

+

(

)

×

1.225

∆%

×

510

∆%

−

10.2

−













=ΚΩ