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參數資料
| 型號： | TPS54073PWPRG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩壓器 |
| 英文描述： | 25 A SWITCHING REGULATOR, 762 kHz SWITCHING FREQ-MAX, PDSO28 |
| 封裝： | GREEN, PLASTIC, HTSSOP-28 |
| 文件頁數： | 13/26頁 |
| 文件大小： | 850K |
| 代理商： | TPS54073PWPRG4 |
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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相關代理商/技術參數 |
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| TPS5410 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:1-A, WIDE INPUT RANGE, STEP-DOWN SWIFT CONVERTER |
| TPS5410D | 功能描述:直流/直流開關調節器 5.5V to 36V Input 1A Step Down Conv RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| TPS5410DG4 | 功能描述:直流/直流開關調節器 5.5V to 36V Input 1A Step Down Conv RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| TPS5410DR | 功能描述:直流/直流開關調節器 5.5V-36V Input 1A Step Down Converter RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| TPS5410DRG4 | 功能描述:直流/直流開關調節器 5.5V-36V Input 1A Step Down Converter RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
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