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DESCRIPTION (continued)

TPS40192, TPS40193

SLUS719B – MARCH 2007 – REVISED SEPTEMBER 2007

Short circuit detection is done by sensing the voltage drop across the low-side MOSFET when it is on and

comparing it with a user selected threshold of 100 mV, 200 mV or 280 mV. The threshold is set with a single

external resistor connected from COMP to GND. This resistor is sensed at startup and the selected threshold is

latched. Pulse by pulse limiting (to prevent current runaway) is provided by sensing the voltage across the

high-side MOSFET when it is on and terminating the cycle when the voltage drop rises above a fixed threshold of

550 mV. When the controller senses an output short circuit, both MOSFETs are turned off and a timeout period

is observed before attempting to restart. This provides limited power dissipation in the event of a sustained fault.

ORDERING INFORMATION

TAPE AND REEL

PACKAGE

FREQUENCY (kHz)

PART NUMBER

QUANTITY

250

TPS40193DRCT

300

3000

TPS40193DRCR

-40

°C to 85°C

Plastic 10-Pin SON (DRC)

250

TPS40192DRCT

600

3000

TPS40192DRCR

2

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Product Folder Link(s): TPS40192 TPS40193