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参数资料
| 型号： | TPS54073PWP |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 25 A SWITCHING REGULATOR, 762 kHz SWITCHING FREQ-MAX, PDSO28 |
| 封装： | GREEN, PLASTIC, HTSSOP-28 |
| 文件页数： | 13/26页 |
| 文件大小： | 850K |
| 代理商： | TPS54073PWP |
OVERCURRENT PROTECTION
THERMAL SHUTDOWN
POWER-GOOD (PWRGD)
SLVS547 – FEBRUARY 2005 ............................................................................................................................................................................................ www.ti.com
The cycle-by-cycle current limiting is achieved by sensing the current flowing through the high-side MOSFET and
comparing this signal to a preset overcurrent threshold. The high-side MOSFET is turned off within 200 ns of
reaching the current limit threshold. A 100-ns leading-edge blanking circuit prevents current limit false tripping.
Current limit detection occurs only when current flows from VIN to PH when sourcing current to the output filter.
Load protection during current sink operation is provided by thermal shutdown.
The device uses the thermal shutdown to turn off the power MOSFETs and disable the controller if the junction
temperature exceeds 150°C. The device is released from shutdown automatically when the junction temperature
decreases to 10°C below the thermal shutdown trip point, and starts up under control of the slow-start circuit.
Thermal shutdown provides protection when an overload condition is sustained for several milliseconds. With a
persistent fault condition, the device cycles continuously; starting up by control of the slow-start circuit, heating
up due to the fault condition, and then shutting down on reaching the thermal shutdown trip point. This sequence
repeats until the fault condition is removed.
The power-good circuit monitors for undervoltage conditions on VSENSE. If the voltage on VSENSE is 10%
below the reference voltage, the open-drain PWRGD output is pulled low. PWRGD is also pulled low if VIN is
less than the UVLO threshold or SS/ENA is low. When VIN, UVLO threshold, SS/ENA, enable threshold, and
VSENSE > 90% of Vref, the open-drain output of the PWRGD pin is high. A hysteresis voltage equal to 3% of Vref
and a 35-
s falling-edge deglitch circuit prevent tripping of the power-good comparator due to high-frequency
noise.
20
Copyright 2005, Texas Instruments Incorporated
Product Folder Link(s): TPS54073
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