參數(shù)資料
型號(hào)： TPS54550PWP
廠商： TEXAS INSTRUMENTS INC
元件分類(lèi)： 穩(wěn)壓器
英文描述： 9.5 A SWITCHING REGULATOR, 700 kHz SWITCHING FREQ-MAX, PDSO16
封裝： GREEN, PLASTIC, HTSSOP-16
文件頁(yè)數(shù)： 3/31頁(yè)
文件大小： 913K
代理商： TPS54550PWP
www.ti.com
PWM Control and Feed Forward
Dead-time Control
Low Side Gate Driver (LSG)
Thermal Shutdown
SLVS623A – MARCH 2006 – REVISED APRIL 2006
The minimum on time is designed to be 180 ns.
During the internal slow-start interval, the internal
Signals from the error amplifier output, oscillator, and
reference ramps from 0 V to 0.891 V. During the
current limit circuit are processed by the PWM
initial
slow-start
interval,
the
internal
reference
control logic. Referring to the internal block diagram,
voltage is very small, resulting in a couple of skipped
the control logic includes the PWM comparator,
pulses because the minimum on time causes the
PWM latch, and the adaptive dead-time control logic.
actual output voltage to be slightly greater than the
During steady-state operation below the current limit
preset output voltage until the internal reference
threshold, the PWM comparator output and oscillator
ramps up.
pulse train alternately reset and set the PWM latch.
Once the PWM latch is reset, the low-side driver and
integrated pull-down MOSFET remain on for a
Adaptive dead-time control prevents shoot-through
minimum duration set by the oscillator pulse width.
current from flowing in the integrated high-side
During this period, the PWM ramp discharges rapidly
MOSFET and the external low-side MOSFET during
to the valley voltage. When the ramp begins to
the switching transitions by actively controlling the
charge back up, the low-side driver turns off and the
turn on times of the drivers. The high-side driver
high-side FET turns on. The peak PWM ramp
does not turn on until the voltage at the gate of the
voltage varies inversely with input voltage to maintain
low-side MOSFET is below 1 V. The low-side driver
a constant modulator and power stage gain of 8 V/V.
does not turn on until the voltage at the gate of the
As the PWM ramp voltage exceeds the error
high-side MOSFET is below 1 V.
amplifier output voltage, the PWM comparator resets
the latch, thus turning off the high-side FET and
turning on the low-side FET. The low-side driver
LSG is the output of the low-side gate driver. The
remains on until the next oscillator pulse discharges
100-mA MOSFET driver is capable of providing gate
the PWM ramp.
drive for most popular MOSFETs suitable for this
During transient conditions, the error amplifier output
application. Use the SWIFT Designer Software Tool
can be below the PWM ramp valley voltage or above
to find the most appropriate MOSFET for the
the PWM peak voltage. If the error amplifier is high,
application. Connect the LSG pin directly to the gate
the PWM latch is never reset and the high-side FET
of the low-side MOSFET. Do not use a gate resistor
remains on until the oscillator pulse signals the
as the resulting turn-on time may be too slow.
control logic to turn the high-side FET off and the
internal low-side FET and driver on. The device
operates at its maximum duty cycle until the output
The device uses the thermal shutdown to turn off the
voltage rises to the regulation set point, setting
MOSFET drivers and controller if the junction
VSENSE to approximately the same voltage as the
temperature
exceeds
+165
°C. The device is
internal voltage reference. If the error amplifier output
restarted
automatically
when
the
junction
is low, the PWM latch is continually reset and the
temperature decreases to 7
°C below the thermal
high-side FET does not turn on. The internal low-side
shutdown trip point and starts up under control of the
FET and low-side driver remain on until the VSENSE
slow-start circuit.
voltage decreases to a range that allows the PWM
comparator to change states. The TPS54550 is
capable of sinking current through the external
low-side FET until the output voltage reaches the
regulation set point.
11
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TPS54550PWP 制造商:Texas Instruments 功能描述:PWM SWITCHER FET 6A O/P HTSSOP16 制造商:Texas Instruments 功能描述:PWM SWITCHER, FET 6A O/P, HTSSOP16 制造商:Texas Instruments 功能描述:PWM SWITCHER, FET 6A O/P, HTSSOP16; Primary Input Voltage:20V; No. of Outputs:1; Output Voltage:12V; Output Current:6A; Voltage Regulator Case Style:HTSSOP; No. of Pins:16; Operating Temperature Min:-40C; Operating Temperature ;RoHS Compliant: Yes
TPS54550PWPG4 功能描述:直流/直流開(kāi)關(guān)調(diào)節(jié)器 4.5 to 20V Input 6A Step Down RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開(kāi)關(guān)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(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5
TPS54550PWPR 功能描述:開(kāi)關(guān)變換器、穩(wěn)壓器與控制器 4.5 to 20V Input 6A Step Down RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開(kāi)關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel
TPS54550PWPR/2801 功能描述:直流/直流開(kāi)關(guān)調(diào)節(jié)器 4.5-20Vin,5A Sync SD Converter RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開(kāi)關(guān)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(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5
TPS54550PWPRG4 功能描述:開(kāi)關(guān)變換器、穩(wěn)壓器與控制器 4.5 to 20V Input 6A Step Down RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開(kāi)關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel
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