EV1340QI Datasheet, PDF (13/20 Pages) Enpirion, Inc. – 5A Synchronous Highly Integrated DC-DC DDR2/3/QDRTM Memory Termination and Low VIN Power SoC

of the switching cycle. If the over-current
condition lasts only a few switching cycles,
normal PWM operation is resumed. If the over-
current condition persists, the circuit will
continue to protect the load by entering a
hiccup mode. In the hiccup mode, the output is
disabled for approximately 20ms and then it
goes through a soft-start. The output will no
longer track the input voltage briefly as a result
of the fault condition. This cycle can continue
indefinitely as long as the over current
condition persists.
Thermal Overload Protection
Temperature sensing circuits in the controller
will disable operation when the Junction
temperature exceeds approximately 150ºC.
When the junction temperature drops by
EV1340QI
approx 20ºC, the converter will re-start with a
normal soft-start cycle.
Input Under-Voltage Lock-Out
When the AVIN pin voltage is below a required
voltage level (V_UVLOR) for normal operation,
converter switching is inhibited. The lock-out
threshold has hysteresis to prevent chatter.
When the device is operating normally, the
AVIN voltage must fall below the lower
threshold (V_UVLOF) for the device to stop
switching.
©Enpirion 2011 all rights reserved, E&OE
06218
13
10/19/2011
www.enpirion.com
Rev: A