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| SP6123 Datasheet, PDF (7/18 Pages) Sipex Corporation – Low Voltage, Synchronous Step-Down PWM Controller Ideal for 2A to 10A, Small Footprint, DC-DC Power Converters | |||
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A more detailed description of the waveform is shown below.
SP6123 OVER CURRENT (HICCUP MODE)
Test Conditions
VFB = 0.7V
VCC = 5.0V
BST = 5.0V
SWN - tied to GND through 1k Resistor
COMP â released from GND
OPERATION
Overcurrent Detected
GH Turns Off
(Fault Mode Enabled)
Internal SSTART rises until
~ VCC-1V, then gives command
to attempt RESTART
GH
COMP
ENABLE
Part
COMP Clamps
~ 3V
After pop, COMP
retains internal
SSTART slope
Attempt
RESTART
5µA PULLUP slope to 0.3V;
35µA PULLUP to 0.7V
Internal SSTART
passes V(VFB), COMP
pops to ~ internal
SSTART voltage +0.7V
Date: 5/25/04
SP6123 Low Voltage, Synchronous Step Down PWM Controller
7
© Copyright 2004 Sipex Corporation
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