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TPS54331 Fiches technique(PDF) 9 Page - Texas Instruments

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No de pièce TPS54331
Description  TPS54331 3-A, 28-V Input, Step Down DC-DC Converter With Eco-mode
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Fabricant  TI1 [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI1 - Texas Instruments

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TPS54331
www.ti.com
SLVS839F – JULY 2008 – REVISED OCTOBER 2014
8 Detailed Description
8.1 Overview
The TPS54331 device is a 28-V, 3-A, step-down (buck) converter with an integrated high-side n-channel
MOSFET. To improve performance during line and load transients, the device implements a constant-frequency,
current mode control which reduces output capacitance and simplifies external frequency compensation design.
The TPS54331 device has a preset switching frequency of 570 kHz.
The TPS54331 device requires a minimum input voltage of 3.5 V for normal operation. The EN pin has an
internal pullup current source that can adjust the input-voltage undervoltage lockout (UVLO) with two external
resistors. In addition, the pullup current provides a default condition when the EN pin is floating for the device to
operate. The operating current is 110
μA (typical) when not switching and under no load. When the device is
disabled, the supply current is 1
μA (typical).
The integrated 80-m
Ω high-side MOSFET allows for high-efficiency power-supply designs with continuous output
currents up to 3 A.
The TPS54331 device reduces the external component count by integrating the boot recharge diode. The bias
voltage for the integrated high-side MOSFET is supplied by an external capacitor on the BOOT to PH pin. The
boot capacitor voltage is monitored by an UVLO circuit and turns the high-side MOSFET off when the voltage
falls below a preset threshold of 2.1 V (typical). The output voltage can be stepped down to as low as the
reference voltage.
By adding an external capacitor, the slow-start time of the TPS54331 device can be adjustable which enables
flexible output filter selection.
To improve the efficiency at light load conditions, the TPS54331 device enters a special pulse skipping Eco-
mode when the peak inductor current drops below 160 mA (typical).
The frequency foldback reduces the switching frequency during startup and overcurrent conditions to help control
the inductor current. The thermal shutdown provides additional protection under fault conditions.
Copyright © 2008–2014, Texas Instruments Incorporated
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