Technical Reference Notes
Hercules (AEH/ALH60) Open
Frame or HS Adapted
Basic Operation and Features
(continued)
Output Over Voltage Protection
The output over voltage system consists of a separate control loop, independent of the primary feedback path. This control
loop has a higher voltage set point than the main circuit. In a fault condition, the converter latches which ensures that the
output voltage does not exceed V
O,CLAMP,max
. The converter will operate back normally once the fault is removed and the
input voltage is cycled or the enable pin is toggled.
Output Over Current Protection
To provide protection in an output overload or short circuit condition, the converter is equipped with current limiting
circuitry and can endure fault conditions for an unlimited duration. At the point of current-limit inception, the converter
latches, causing the output current to be limited both in peak and duration. The converter will operate back normally once
the overload/ fault is removed and the input voltage is cycled or the enable pin is toggled.
Enable Function
Two enable options are available. Positive Logic Enable (no suffix required in part number) and Negative Logic Enable
(suffix “N”). Positive Logic Enable turns the converter on during a logic-high voltage on the enable pin, and off during a
logic-low. Negative Logic Enable turns the converter off during a logic-high and on during a logic-low.
MODEL: AEH/ALH60F48
SEPTEMBER 26, 2002 - REVISION 02
SHEET 8 OF 21
ASTEC [ Astec America, Inc ]
