Technical Reference Notes

ALO25F24

(Single Output 8

MODEL: ALO25F24

SHEET 7 OF 13

AUGUST 23, 2005 - REVISION H

Basic Operation and Features (continued)

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.

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

OVER CURRENT PROTECTION (OCP)

The Over Current Protection is latching with auto-restart. The converter shuts down once the output current reaches the OCP

range. The converter will attempt to restart until the fault is removed. Latching OCP mode is available as an option (no model

part number assigned). This feature is only for module protection and no intention to customer application.

OUTPUT OVER VOLTAGE PROTECTION (OVP)

The Over Voltage Protection circuit is latching with auto-restart. The converter will latch-off and attempt to restart until the

fault is removed. Latching OVP mode is available as an option (no model part number assigned).

OVER TEMPERATURE PROTECTION (OTP)

The Over Temperature Protection circuit will shutdown the converter once the average PCB temperature reaches the OTP

range. This feature prevents the unit from overheating and consequently going into thermal runaway, which may further

damage the converter and the end system. Such overheating may be an effect of operation outside the given power thermal

derating conditions. Restart is possible once the temperature of the sensed location drops to less than 103

°C.

REMOTE SENSE

The remote sense pins can be used to compensate for any voltage drops (per indicated max limits) that may occur along the

connection between the output pins to the load. Pin 7 (+Sense) and Pin 5 (-Sense) should be connected to Pin 8 (+Vout) and

Pin 4 (Return) respectively at the point where regulation is desired. The combination of remote sense and trim adjust cannot

derated and maximum output power must not be exceeded.