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TPS54231 Datasheet(PDF) 9 Page - Texas Instruments

No. de pieza TPS54231
Descripción Electrónicos  TPS54231 2-A, 28-V Input, Step-Down DC-DC Converter With Eco-mode?
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TPS54231 Datasheet(HTML) 9 Page - Texas Instruments

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TPS54231
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SLUS851D – OCTOBER 2008 – REVISED OCTOBER 2014
8 Detailed Description
8.1 Overview
The TPS54231 device is a 28-V, 2-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 TPS54231 device has a pre-set switching frequency of 570 kHz.
The TPS54231 device requires a minimum input voltage of 3.5 V for normal operation. The EN pin has an
internal pullup current source that can be used to 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 75
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 2 A.
The TPS54231 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 TPS54231 device can be adjustable which enables
flexible output filter selection.
To improve the efficiency at light load conditions, the TPS54231 device enters a special pulse skipping Eco-
mode when the peak inductor current drops below 100 mA (typical).
The frequency foldback reduces the switching frequency during startup and overcurrent conditions to help control
the inductor current. The thermal shut down provides the additional protection under fault conditions.
Copyright © 2008–2014, Texas Instruments Incorporated
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