參數(shù)資料
型號(hào)： TPS54350MPWPREP
廠商： TEXAS INSTRUMENTS INC
元件分類： 穩(wěn)壓器
英文描述： 7.2 A SWITCHING REGULATOR, 700 kHz SWITCHING FREQ-MAX, PDSO16
封裝： GREEN, PLASTIC, HTSSOP-16
文件頁(yè)數(shù)： 3/36頁(yè)
文件大小： 1057K
代理商： TPS54350MPWPREP
www.ti.com
Power Good (PWRGD)
T
delay +
1000
s(kHz)
ms
(5)
Bias Voltage (VBIAS)
Bootstrap Voltage (BOOT)
Error Amplifier
Voltage Reference
PWM Control and Feed Forward
TPS54350-EP
SGLS308 – OCTOBER 2005
The VSENSE pin is compared to an internal reference signal, if the VSENSE is greater than 97% and no other
faults are present, the PWRGD pin presents a high impedance. A low on the PWRGD pin indicates a fault. The
PWRGD pin has been designed to provide a weak pulldown and indicates a fault even when the device is
unpowered. If the TPS54350 has power and has any fault flag set, the TPS54350 indicates the power is not
good by driving the PWRGD pin low. The following events, singly or in combination, indicate power is not good:
VSENSE pin out of bounds
Overcurrent
Thermal shutdown
UVLO undervoltage
Input voltage not present (weak pull down)
Slow starting
VBIAS voltage is low
Once the PWRGD pin presents a high impedance (i.e., power is good), a VSENSE pin out of bounds condition
forces PWRGD pin low (i.e., power is bad) after a time delay. This time delay is a function of the switching
frequency and is calculated using Equation 5:
The VBIAS regulator provides a stable supply for the internal analog circuits and the low side gate driver. Up to 1
mA of current can be drawn for use in an external application circuit. The VBIAS pin must have a bypass
capacitor value of 1 F. X7R or X5R grade dielectric ceramic capacitors are recommended because of their
stable characteristics over temperature.
The BOOT capacitor obtains its charge cycle by cycle from the VBIAS capacitor. A capacitor from the BOOT pin
to the PH pins is required for operation. The bootstrap connection for the high side driver must have a bypass
capacitor of 0.1 F.
The VSENSE pin is the error amplifier inverting input. The error amplifier is a true voltage amplifier with 1.5 mA
of drive capability with a minimum of 60 dB of open loop voltage gain and a unity gain bandwidth of 2 MHz.
The voltage reference system produces a precision reference signal by scaling the output of a temperature
stable bandgap circuit. During production testing, the bandgap and scaling circuits are trimmed to produce 0.891
V at the output of the error amplifier, with the amplifier connected as a voltage follower. The trim procedure
improves the regulation, since it cancels offset errors in the scaling and error amplifier circuits.
Signals from the error amplifier output, oscillator, and current limit circuit are processed by the PWM control logic.
Referring to the internal block diagram, the control logic includes the PWM comparator, PWM latch, and the
adaptive dead-time control logic. During steady-state operation below the current limit threshold, the PWM
comparator output and oscillator pulse train alternately reset and set the PWM latch.
Once the PWM latch is reset, the low-side driver and integrated pulldown MOSFET remain on for a minimum
duration set by the oscillator pulse width. During this period, the PWM ramp discharges rapidly to the valley
voltage. When the ramp begins to charge back up, the low-side driver turns off and the high-side FET turns on.
The peak PWM ramp voltage varies inversely with input voltage to maintain a constant modulator and power
stage gain of 8 V/V.
11
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TPS54350MPWPREPG4 功能描述:直流/直流開(kāi)關(guān)調(diào)節(jié)器 4.5 to 20V Input,3A Step Down 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
TPS54350PWP 功能描述:直流/直流開(kāi)關(guān)調(diào)節(jié)器 4.5 to 20V Inp 3A Step-Down 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
TPS54350PWP 制造商:Texas Instruments 功能描述:IC's
TPS54350PWPG4 功能描述:直流/直流開(kāi)關(guān)調(diào)節(jié)器 4.5 to 20V Inp 3A Step-Down 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
TPS54350PWPR 功能描述:開(kāi)關(guān)變換器、穩(wěn)壓器與控制器 4.5 to 20V Inp 3A Step-Down Converter 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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