TPS40000, TPS40001

TPS40002, TPS40003

TPS40004, TPS40005

SLUS507D − JANUARY 2002 − REVISED NOVEMBER 2005

10

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APPLICATION INFORMATION

UDG−01144

GND

Fixed Delay

Adaptive Delay

Predictive Delay

Channel Conduction

Body Diode Conduction

Figure 2. Switch Node Waveforms for Synchronous Buck Converter

overcurrent

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.