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TPS40193DRCTG4 Fiches technique(PDF) 11 Page - Texas Instruments

No de pièce TPS40193DRCTG4
Description  4.5-V TO 18-V INPUT 10-PIN SYNCHRONOUS BUCK CONTROLLER WITH POWER GOOD
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Fabricant  TI [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI - Texas Instruments

TPS40193DRCTG4 Fiches technique(HTML) 11 Page - Texas Instruments

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APPLICATION INFORMATION
Introduction
Voltage Reference
Oscillator
UVLO
TPS40192, TPS40193
SLUS719B – MARCH 2007 – REVISED SEPTEMBER 2007
The TPS40192 and TPS40193 are cost optimized controllers providing all the necessary features to construct a
high performance DC/DC converter while keeping costs to a minimum. Support for pre-biased outputs eliminates
concerns about damaging sensitive loads during startup. Strong gate drivers for the high side and rectifier
N-channel MOSFETs decrease switching losses for increased efficiency. Adaptive gate drive timing prevents
shoot through and minimizes body diode conduction in the rectifier MOSFET, also increasing efficiency.
Selectable short circuit protection thresholds and hiccup recovery from a short circuit increase design flexibility
and minimize power dissipation in the event of a prolonged output fault. A dedicated enable pin (ENABLE) allows
the converter to be placed in a very low quiescent current shutdown mode. Internally fixed switching frequency
and soft-start time reduce external component count, simplifying design and layout, as well as reducing footprint
and cost. The 3 mm
× 3 mm package size also contributes to a reduced overall converter footprint.
The band gap cell is designed with a trimmed 591 mV output. The 0.5% tolerance on the reference voltage
allows the user to design a very accurate power-supply.
The TPS40192 has a fixed internal switching frequency of 600 kHz while the TPS40193 operates at 300 kHz.
When the input voltage is below the UVLO threshold, the device holds all gate drive outputs in the low (OFF)
state. When the input rises above the UVLO threshold, and the ENABLE pin is above the turn ON threshold, the
oscillator begins to operate and the start-up sequence is allowed to begin. The UVLO level is internally fixed at
4.2 V.
Copyright © 2007, Texas Instruments Incorporated
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Product Folder Link(s): TPS40192 TPS40193


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