Technical Reference Notes

AEO_ALO40/35/30/20/10x48 Series

(Single Output 8

MODEL: AEO40x48 / ALO40x48 SERIES

SHEET 7 OF 30

JUNE 24, 2005 - REVISION B

Figure 4. External resistor configuration to decrease the o/p.

Figure 3. External resistor configuration to increase the o/p.

Basic Operation and Features

INPUT UNDER VOLTAGE LOCKOUT

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.

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

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

OUTPUT ENABLE

The converter comes with an Enable pin (PIN 2), which is primarily used to turn ON/OFF the converter. Both a Positive (no “N”

suffix required) and a Negative (suffix “N” required) Enable Logic options are being offered. Please refer to Table 2 for the Part

Numbering Scheme.

For Positive Enable, the converter is turned on when the Enable pin is at logic HIGH or left open. The unit turns off when the

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