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參數資料
| 型號： | TPS54974PWPG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩壓器 |
| 英文描述： | 16 A SWITCHING REGULATOR, 762 kHz SWITCHING FREQ-MAX, PDSO28 |
| 封裝： | GREEN, PLASTIC, HTSSOP-28 |
| 文件頁數： | 6/21頁 |
| 文件大小： | 743K |
| 代理商： | TPS54974PWPG4 |
www.ti.com
OVERCURRENT PROTECTION
POWER-GOOD (PWRGD)
THERMAL SHUTDOWN
TPS54974
SLVS458B – JANUARY 2003 – REVISED FEBRUARY 2005
Thermal shutdown provides protection when an over-
load condition is sustained for several milliseconds.
The cycle-by-cycle current limiting is achieved by
With a persistent fault condition, the device cycles
sensing the current flowing through the high-side
continuously; starting up by control of the slow-start
MOSFET and comparing this signal to a preset
circuit, heating up due to the fault condition, and then
overcurrent threshold. The high-side MOSFET is
shutting down on reaching the thermal shutdown
turned off within 200 ns of reaching the current limit
trip-point. This sequence repeats until the fault con-
threshold. A 100-ns leading edge blanking circuit
dition is removed.
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
The power-good circuit monitors for undervoltage
thermal shutdown.
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
The device uses the thermal shutdown to turn off the
is low. When VIN
≥ UVLO threshold, SS/ENA ≥
power MOSFETs and disable the controller if the
enable threshold, and VSENSE > 90% of Vref, the
junction temperature exceeds 150
°C. The device is
open-drain output of the PWRGD pin is high. A
released from shutdown automatically when the junc-
hysteresis voltage equal to 3% of Vref and a 35-s
tion temperature decreases to 10
°C below the ther-
falling edge deglitch circuit prevent tripping of the
mal shutdown trip-point, and starts up under control
power-good comparator due to high-frequency noise.
of the slow-start circuit.
14
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| TPS54974PWPR | 功能描述:直流/直流開關調節器 Dl Inp Bus 3.3 2.5V 9A Output Synch Buck 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 |
| TPS54974PWPRG4 | 功能描述:直流/直流開關調節器 Dl Inp Bus 3.3 2.5V 9A Output Synch Buck 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 |
| TPS54980 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:SWIFT Converter Product Portfolio |
| TPS54980EVM-022 | 功能描述:電源管理IC開發工具 3.3/5Vin 9-A Seq DC/DC Conv Mod RoHS:否 制造商:Maxim Integrated 產品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| TPS54980PWP | 功能描述:直流/直流開關調節器 3.3V Inp Sync Buck 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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