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參數(shù)資料
| 型號(hào)： | TPS54354MPWPREP |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 6.5 A SWITCHING REGULATOR, 700 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | GREEN, PLASTIC, HTSSOP-16 |
| 文件頁數(shù)： | 5/35頁 |
| 文件大?。?/td> | 1132K |
| 代理商： | TPS54354MPWPREP |
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Deadtime Control
Low-Side Gate Driver (LSG)
Integrated Pulldown MOSFET
L(H) +
VO
1 *
VO
VI
s 0.6
(7)
Thermal Shutdown
Overcurrent Protection
T
HICCUP
(ms) +
2250
s (kHz)
(8)
,, TPS54353-EP,, TPS54354-EP
www.ti.com ....................................................................................................................................................... SLVS684A – JANUARY 2007 – REVISED JULY 2009
Adaptive dead-time control prevents shoot-through current from flowing in the integrated high-side MOSFET and
the external low-side MOSFET during the switching transitions by actively controlling the turn-on times of the
drivers. The high-side driver does not turn on until the voltage at the gate of the low-side MOSFET is below 1 V.
The low-side driver does not turn on until the voltage at the gate of the high-side MOSFET is below 1 V.
LSG is the output of the low-side gate driver. The 100-mA MOSFET driver is capable of providing gate drive for
most popular MOSFETs suitable for this application. Use the SWIFT Designer Software Tool to find the most
appropriate MOSFET for the application. Connect the LSG pin directly to the gate of the low-side MOSFET. Do
not use a gate resistor, as the resulting turn-on time may be too slow.
The TPS5435x has a diode-MOSFET pair from PH to PGND. The integrated MOSFET is designed for light-load
continuous-conduction-mode operation when only an external Schottky diode is used. The combination of
devices keeps the inductor current continuous under conditions where the load current drops below the inductor's
critical current. Care should be taken in the selection of inductor in applications using only a low-side Schottky
diode. Since the inductor ripple current flows through the integrated low-side MOSFET at light loads, the
inductance value should be selected to limit the peak current to less than 0.3 A during the high-side FET turn-off
time. The minimum value of inductance is calculated using the following equation:
The device uses the thermal shutdown to turn off the MOSFET drivers and controller if the junction temperature
exceeds 165°C. The device is restarted automatically when the junction temperature decreases to 7°C below the
thermal shutdown trip point and starts up under control of the slow-start circuit.
Overcurrent protection is implemented by sensing the drain-to-source voltage across the high-side MOSFET and
compared to a voltage level that represents the overcurrent threshold limit. If the drain-to-source voltage exceeds
the overcurrent threshold limit for more than 100 ns, the ENA pin is pulled low, the high-side MOSFET is
disabled, and the internal digital slow-start is reset to 0 V. ENA is held low for approximately the time that is
calculated by the following equation:
Once the hiccup time is complete, ENA is released and the converter initiates the internal slow start.
Copyright 2007–2009, Texas Instruments Incorporated
13
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| TPS54354PWP | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 4.5 to 20V Inp 3-A Synch PWM Switch RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(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 |
| TPS54354PWPG4 | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 4.5 to 20V Inp 3-A Synch PWM Switch 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 |
| TPS54354PWPR | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 4.5 to 20V Inp 3-A Synch PWM Switch 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 |
| TPS54354PWPRG4 | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 4.5 to 20V Inp 3-A Synch PWM Switch 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 |
| TPS54355 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:4.5V TO 20 V INPUT 3-A OUTPUT SYNCHRONOUS PWM SWITCHER WITH INTEGRATED FET |
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