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參數資料
| 型號： | TPS54974PWP |
| 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?。?/td> | 743K |
| 代理商： | TPS54974PWP |
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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