®
ACT2103
Rev 2, 23-May-12
Secondary Over Current Protection
(SOCP)
In normal operation, ACT2103 high-side FET
current is protected by cycle-by-cycle current limit.
In some fault conditions, the input current may run
away. SOCP current limit is set 30% higher than
cycle-by-cycle current limit, and once SOCP is
triggered, ACT2103 goes into hiccup mode and
reduce the power dissipation significantly.
Enable Pin
The ACT2103 has an enable input EN for turning
the IC on or off. The EN pin contains a precision
2.5V comparator with 75mV hysteresis and a 1.3μA
pull-up current source. The comparator can be used
with a resistor divider from V
IN
to program a startup
voltage higher than the normal UVLO value. If left
floating, the EN pin will be pulled up to roughly 5V
by the internal 1.3μA current source. It can be
driven from standard logic signals greater than
2.5V, or driven with open-drain logic to provide
digital on/off control.
Thermal Shutdown
The ACT2103 disables switching when its junction
temperature exceeds 160°C and resumes when the
temperature has dropped by 30°C.
Innovative Power
TM
-6-
www.active-semi.com
Copyright © 2012 Active-Semi, Inc.
ACTIVE-SEMI [ ACTIVE-SEMI, INC ]
