Technical Reference Notes
AEO_ALO40/35/30/20/10x48 Series
(Single Output 8th Brick)
Basic Operation and Features (continued)
OUTPUT OVER VOLTAGE PROTECTION (OVP)
The Over Voltage Protection circuit is non-latching - auto recovery mode. The output of the converter is terminated under an OVP
fault condition (Vo > OVP threshold). The converter will attempt to restart until the fault is removed. There is a 100ms lockout
period between restart attempts.
OVER CURRENT PROTECTION (OCP)
The Over Current Protection is non-latching - auto recovery mode. The converter shuts down once the output current reaches the
OCP range. The converter will attempt to restart until the fault is removed. There is a 100ms lockout period between restart
attempts.
OVER TEMPERATURE PROTECTION (OTP)
The Over Temperature Protection circuit will shutdown the converter once the average PCB temperature (See Figure 90B for OTP
reference sense point) 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 110°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 VO. 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: AEO40x48 / ALO40x48 SERIES
JUNE 24, 2005 - REVISION B
SHEET 8 OF 30
ASTEC [ Astec America, Inc ]
