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| 型號(hào)： | TPS40055MPWPREPG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | PLASTIC, HTSSOP-16 |
| 文件頁數(shù)： | 11/35頁 |
| 文件大?。?/td> | 2348K |
| 代理商： | TPS40055MPWPREPG4 |
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UDG02139
I
ANTICROSS
CONDUCTION
SYNCHRONOUS
RECTIFIER ON
BODY DIODE
CONDUCTION
BODY DIODE
CONDUCTION
HIGH SIDE ON
ID1
ID2
IO
SW
0
}
d
1d
www.ti.com
SGLS310B – JULY 2005 – REVISED OCTOBER 2010
Figure 15. Inductor Current and SW Node Waveforms
The maximum allowable power dissipation in the MOSFET is determined by Equation 34.
(34)
where:
(35)
and qJA is the package thermal impedance.
SYNCHRONOUS RECTIFIER MOSFET POWER DISSIPATION
The power dissipated in the synchronous rectifier MOSFET is comprised of three components: RDS(on) conduction
losses, body diode conduction losses, and reverse recovery losses. RDS(on) conduction losses can be found using
Equation 31 and the RMS current through the synchronous rectifier MOSFET is described in Equation 36.
(36)
The body-diode conduction losses are due to forward conduction of the body diode during the anti-cross
conduction delay time. The body diode conduction losses are described by Equation 37.
(37)
where:
VF is the body diode forward voltage
tDELAY is the delay time just before the SW node rises
The 2-multiplier is used because the body diode conducts twice during each cycle (once on the rising edge and
once on the falling edge). The reverse recovery losses are due to the time it takes for the body diode to recovery
from a forward bias to a reverse blocking state. The reverse recovery losses are described in Equation 38.
(38)
where:
QRR is the reverse recovery charge of the body diode.
Copyright 2005–2010, Texas Instruments Incorporated
19
Product Folder Link(s): TPS40055-EP
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| TPS40055PWP | 功能描述:DC/DC 開關(guān)控制器 Wide Input Sync Buck Cntrlr source/sink RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| TPS40055PWPG4 | 功能描述:DC/DC 開關(guān)控制器 Wide Input Sync Buck Cntrlr source/sink RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| TPS40055PWPR | 功能描述:DC/DC 開關(guān)控制器 Wide Input Sync Buck Cntrlr source/sink RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| TPS40055PWPRG4 | 功能描述:DC/DC 開關(guān)控制器 Wide Input Sync Buck Cntrlr source/sink RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| TPS40056 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:WIDE-INPUT SYNCHRONOUS, TRACKING BUCK CONTROLLER |
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