SP6123 データシートの表示（PDF） - Signal Processing Technologies

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SP6123

Low Voltage, Synchronous Step-Down PWM Controller

Signal Processing Technologies 

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 – 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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