ALQ25_03 Datasheet, PDF(10/15 Page) Astec America, Inc – Single Output Open-Frame DC-DC Converter Module Industry Standard ¼ Brick: 36V-75V Input / 5V Output

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ALQ25_03 Datasheet, PDF (10/15 Pages) Astec America, Inc – Single Output Open-Frame DC-DC Converter Module Industry Standard ¼ Brick: 36V-75V Input / 5V Output

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Technical Reference Notes

ALQ25 Series

(Open Frame Single Output Quarter Brick)

OUTPUT ENABLE

The ALQ25 series comes with an ENABLE pin (PIN 2), which is primarily used to turn ON/OFF the converter. Both a

Positive (no part number suffix required) and a Negative (suffix âNâ 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 ENABLE pin is at logic LOW or directly connected to -VIN. On the other hand, the Negative Enable version turns unit on

when the ENABLE pin is at logic LOW or directly connected to -VIN. The unit turns off when the ENABLE pin is at Logic

HIGH.

OUTPUT OVER VOLTAGE PROTECTION (OVP)

The Over-Voltage Protection consists of circuitry that monitors the voltage on the output terminals. If the output voltage

exceeds the Over Voltage Protection threshold limit, module will work on intermittent model. When the Over Voltage

condition is removed, the module will automatically restart.

The protection mechanism is such that the unit can continue in this condition until the fault is cleared.

OVER CURRENT PROTECTION (OCP)

The Over Current Protection circuit comes in latching mode. The converter is latched off if the load current on the output

reaches the OCP threshold limit. The OCP latch can be reset either by cycling the input voltage or toggling the Enable signal

for 100ms. Consult factory for Auto-restart option.

The Over Current Protection (OCP) circuit comes in foldback current limit. If output current exceed the OCP threshold limit,

or at a short circuit condition, the module will work on intermittent model. When the Over Current condition is removed, the

module will automatically restart.

OVER TEMPERATURE PROTECTION (OTP)

These modules feature an over-temperature protection circuit to safeguard against thermal damage. The module will work on

intermittent mode when the maximum device reference temperature is exceeded. When the over-temperature condition is

removed, the converter will automatically restart

MODEL: ALQ25 SERIES

Dec 1, 2003 - REVISION B

SHEET 10 OF 15

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