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TPS5431DDARG4 Fiches technique(PDF) 10 Page - Texas Instruments

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No de pièce TPS5431DDARG4
Description  3-A, Wide Input Range, Step-Down Converter
Download  36 Pages
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Fabricant  TI1 [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI1 - Texas Instruments

TPS5431DDARG4 Fiches technique(HTML) 10 Page - Texas Instruments

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VIN
UVLO
ENABLE
Thermal
Protection
Reference
Overcurrent
Gate Drive
Oscillator
Ramp
Generator
VREF
PH
ENA
GND
BOOT
Z1
Z2
SHDN
SHDN
SHDN
SHDN
SHDN
SHDN
SHDN
SHDN
VIN
112.5% VREF
VSENSE
OVP
HICCUP
HICCUP
SHDN
NC
Feed Forward
BOOT
NC
POWERPAD
VIN
VOUT
5 µA
1.221 V Bandgap
Slow Start
Boot
Regulator
Error
Amplifier
Gain = 25
PWM
Comparator
Protection
Gate
Driver
Control
VSENSE
Copyright © Texas Instruments Incorporated
10
TPS5430, TPS5431
SLVS632I – JANUARY 2006 – REVISED APRIL 2017
www.ti.com
Product Folder Links: TPS5430 TPS5431
Submit Documentation Feedback
Copyright © 2006–2017, Texas Instruments Incorporated
7 Detailed Description
7.1 Overview
The TPS543x is a 3-A, step-down (buck) regulator with an integrated high-side n-channel MOSFET. The
TPS5431 is intended to operate from power rails up to 23 V and the TPS5430 up to 36 V. These devices
implement constant-frequency voltage-mode control with voltage feed forward for improved line regulation and
line transient response. Internal compensation reduces design complexity and external component count.
The integrated 110-mΩ high-side MOSFET supports high-efficiency power-supply designs capable of delivering
3-A of continuous current to a load. The gate-drive bias voltage for the integrated high-side MOSFET is supplied
by a bootstrap capacitor connected from the BOOT to PH pins. The TPS543x reduces the external component
count by integrating the bootstrap recharge diode.
The TPS543x has a default input start-up voltage of 5.3 V typical. The ENA pin can be used to disable the
TPS543x reducing the supply current to 18 µA. An internal pullup current source enables operation when the
ENA pin is floating. The TPS543x includes an internal slow-start circuit that slows the output rise time during start
up to reduce in rush current and output voltage overshoot. The minimum output voltage is the internal 1.221-V
feedback reference. Output overvoltage transients are minimized by an Overvoltage Protection (OVP)
comparator. When the OVP comparator is activated, the high-side MOSFET is turned off and remains off until
the output voltage is less than 112.5% of the desired output voltage.
Internal cycle-by-cycle overcurrent protection limits the peak current in the integrated high-side MOSFET. For
continuous overcurrent fault conditions the TPS543x will enter hiccup mode overcurrent limiting. Thermal
protection protects the device from overheating.
7.2 Functional Block Diagram


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