TPS40007

TPS40009

SLUS589B− NOVEMBER 2003 − REVISED FEBRUARY 2005

8

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APPLICATION INFORMATION

UDG−03166

GND

Fixed Delay

Adaptive Delay

Predictive Delay

Channel Conduction

Body Diode Conduction

Figure 2. Switch Node Waveforms for Synchronous Buck Converter

SHORT CIRCUIT PROTECTION

Overcurrent conditions in the TPS4000x are sensed by detecting the voltage across the main MOSFET while

it is on.

Basic Description

If the voltage exceeds a pre-set threshold, the current pulse is terminated, and a counter inside the device is

incremented. If this counter fills up, a fault condition is declared and the device disables switching for a period

of time and then attempts to restart the converter with a full soft-start cycle.