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参数资料
| 型号： | TPS54617RUVT |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING REGULATOR, 660 kHz SWITCHING FREQ-MAX, QCC34 |
| 封装： | 3.50 X 7 MM, GREEN, VQFN-34 |
| 文件页数： | 6/21页 |
| 文件大小： | 852K |
| 代理商： | TPS54617RUVT |
Thermal Shutdown
Power Good (PWRGD)
SLVS880A – NOVEMBER 2008 – REVISED JANUARY 2009 ........................................................................................................................................... www.ti.com
The device uses the thermal shutdown to turn off the
The power good circuit monitors for under voltage
power MOSFETs and disable the controller if the
conditions on VSENSE. If the voltage on VSENSE is
junction temperature exceeds 150°C. The device is
10% below the reference voltage, the open-drain
released from shutdown automatically when the
PWRGD output is pulled low. PWRGD is also pulled
junction temperature decreases to 10°C below the
low if VIN is less than the UVLO threshold or SS/ENA
thermal shutdown trip point, and starts up under
is low. When VIN
≥ UVLO threshold, SS/ENA ≥
control of the slow-start circuit.
enable threshold, and VSENSE > 90% of Vref, the
open drain output of the PWRGD pin is high. A
Thermal shutdown provides protection when an
hysteresis voltage equal to 3% of Vref and a 35 s
overload
condition
is
sustained
for
several
falling edge deglitch circuit prevent tripping of the
milliseconds. With a persistent fault condition, the
power good comparator due to high frequency noise.
device cycles continuously; starting up by control of
the soft-start circuit, heating up due to the fault
condition, and then shutting down upon reaching the
thermal shutdown trip point. This sequence repeats
until the fault condition is removed.
14
Copyright 2008–2009, Texas Instruments Incorporated
Product Folder Link(s) :TPS54617
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