ALO25F24 Datasheet, PDF (7/13 Pages) Astec America, Inc – Single Output 8th Brick: Open-Frame Module

Technical Reference Notes
ALO25F24
(Single Output 8^th Brick)
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
Enable pin is at logic LOW or directly connected to -V_IN. On the other hand, the Negative Enable version turns unit on when
the Enable pin is at logic LOW or directly connected to -V_IN. The unit turns off when the Enable pin is at Logic HIGH.
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
exceed 110% of V_O. When output voltage is trimmed up (through remote sensing and/or trim pin), output current must be
derated and maximum output power must not be exceeded.
MODEL: ALO25F24
AUGUST 23, 2005 - REVISION H
SHEET 7 OF 13