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ALO25F24 Datasheet(PDF) 6 Page - Astec America, Inc

Part No. ALO25F24
Description  Single Output 8th Brick: Open-Frame Module
Download  13 Pages
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Maker  ASTEC [Astec America, Inc]
Homepage  http://www.astecinc.com/
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ALO25F24 Datasheet(HTML) 6 Page - Astec America, Inc

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Technical Reference Notes
ALO25F24
(Single Output 8
th Brick)
MODEL: ALO25F24
SHEET 6 OF 13
AUGUST 23, 2005 - REVISION H
+Vin
-Vin
Enable
-Vout
+Vout
-Sense
+Sense
Vadj
Rload
Radj_up
Figure 3. Trim UP test configuration (Pin Side Up).
+Vin
-Vin
Enable
-Vout
+Vout
-Sense
+Sense
Vadj
Rload
Radj_down
Figure 4. Trim DOWN test configuration (Pin Side Up).
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
VIN is in the voltage range of 17.2-17.95 VDC. Likewise, it has also been programmed to turn-off when VIN drops down to
15.8-16.5 VDC.
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.
To INCREASE the output, external Radj_up resistor
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):
To DECREASE the output, external Radj_down resistor
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
Radj_up
5.1
Voset
×
100
∆%
+
()
×
1.225
∆%
×
510
∆%
10.2
=ΚΩ


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