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參數資料
| 型號： | TPS54372PWP |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩壓器 |
| 英文描述： | 3 A SWITCHING REGULATOR, 762 kHz SWITCHING FREQ-MAX, PDSO20 |
| 封裝： | GREEN, PLASTIC, HTSSOP-20 |
| 文件頁數： | 5/18頁 |
| 文件大?。?/td> | 525K |
| 代理商： | TPS54372PWP |
www.ti.com
OVERCURRENT PROTECTION
THERMAL SHUTDOWN
DEAD-TIME CONTROL AND MOSFET
STATUS
TPS54372
SLVS430D – JUNE 2002 – REVISED FEBRUARY 2005
error amplifier output voltage, the PWM comparator
resets the latch, thus turning off the high-side FET
The cycle by cycle current limiting is achieved by
and turning on the low-side FET. The low-side FET
sensing the current flowing through the high-side
remains on until the next oscillator pulse discharges
MOSFET and comparing this signal to a preset
the PWM ramp.
overcurrent threshold. The high-side MOSFET is
During transient conditions, the error amplifier output
turned off within 200 ns of reaching the current limit
could be below the PWM ramp valley voltage or
threshold. A 100-ns leading edge blanking circuit
above the PWM peak voltage. If the error amplifier is
prevents false tripping of the current limit when the
high, the PWM latch is never reset and the high-side
high-side switch is turning on. Current limit detection
FET remains on until the oscillator pulse signals the
occurs only when current flows from VIN to PH when
control logic to turn the high-side FET off and the
sourcing current to the output filter. Load protection
low-side FET on. The device operates at its maxi-
during current sink operation is provided by thermal
mum duty cycle until the output voltage rises to the
shutdown.
regulation set-point, setting VSENSE to approxi-
mately the same voltage as VREF. If the error
amplifier output is low, the PWM latch is continually
The device uses the thermal shutdown to turn off the
reset and the high-side FET does not turn on. The
power MOSFETs and disable the controller if the
low-side FET remains on until the VSENSE voltage
junction temperature exceeds 150
°C. The device is
decreases
to
a
range
that
allows
the
PWM
released from shutdown automatically when the junc-
comparator to change states. The TPS54372 is
tion temperature decreases to 10
°C below the ther-
capable of sinking current continuously until the
mal shutdown trip-point, and starts up under control
output reaches the regulation set-point.
of the slow-start circuit.
If the current limit comparator trips for longer than
Thermal shutdown provides protection when an over-
100 ns, the PWM latch resets before the PWM ramp
load condition is sustained for several milliseconds.
exceeds the error amplifier output. The high-side FET
With a persistent fault condition, the device cycles
turns off and low-side FET turns on to decrease the
continuously; starting up by control of the soft-start
energy in the output inductor and consequently the
circuit, heating up due to the fault condition, and then
output current. This process is repeated each cycle in
shutting down on reaching the thermal limit trip-point.
which the current limit comparator is tripped.
This sequence repeats until the fault condition is
removed.
DRIVERS
Adaptive dead-time control prevents shoot-through
The status pin is an open-drain output that indicates
current
from
flowing
in
both
N-channel
power
when internal conditions are sufficient for proper
MOSFETs during the switching transitions by actively
operation. STATUS can be coupled back to a system
controlling the turnon times of the MOSFET drivers.
controller or monitor circuit to indicate that the termin-
The high-side driver does not turn on until the gate
ation or tracking regulator is ready for start-up.
drive voltage to the low-side FET is below 2 V, while
STATUS is high impedance when the TPS54372 is
the low-side driver does not turn on until the voltage
operating or ready to be enabled.
at the gate of the high-side MOSFET is below 2 V.
The high-side and low-side drivers are designed with
STATUS is active low if any of the following occur:
300-mA source and sink capability to quickly drive the
VIN < UVLO threshold
power MOSFETs gates. The low-side driver is sup-
VBIAS or internal reference have not settled.
plied from VIN, while the high-side drive is supplied
Thermal shutdown is active.
from the BOOT pin. A bootstrap circuit uses an
external BOOT capacitor and an internal 2.5-
.
bootstrap switch connected between the VIN and
BOOT pins. The integrated bootstrap switch improves
drive efficiency and reduces external component
count.
13
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相關代理商/技術參數 |
參數描述 |
|---|---|
| TPS54372PWP | 制造商:Texas Instruments 功能描述:; Voltage Regulator Type:Synchronous Buc |
| TPS54372PWPG4 | 功能描述:直流/直流開關調節器 3-A Act Bus Term/DDR DC/DC 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 |
| TPS54372PWPR | 功能描述:直流/直流開關調節器 3-A Act Bus Term/DDR DC/DC 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 |
| TPS54372PWPRG4 | 功能描述:直流/直流開關調節器 3-A Act Bus Term/DDR DC/DC 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 |
| TPS54372QPWPRQ1 | 功能描述:直流/直流開關調節器 3A Output Tracking/ Term Sync PWM Sw 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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