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OPERATION
A more detailed description of the waveform is shown below.
SP6123 OVER CURRENT (HICCUP MODE)
Test Conditions
V FB = 0.7V
V CC = 5.0V
BST = 5.0V
SWN - tied to GND through 1k Resistor
COMP – released from GND
Overcurrent Detected
G H Turns Off
(Fault Mode Enabled)
Internal SSTART rises until
~ V CC -1V, then gives command
to attempt RESTART
G H
COMP Clamps
~ 3V
COMP
After pop, COMP
ENABLE
Part
retains internal
SSTART slope
Attempt
RESTART
5 μ A PULLUP slope to 0.3V;
35 μ A PULLUP to 0.7V
Internal SSTART
passes V(V FB ), COMP
pops to ~ internal
SSTART voltage +0.7V
Date: 9/13/04
SP6123 Low Voltage, Synchronous Step Down PWM Controller
7
? Copyright 2004 Sipex Corporation
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