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| 型号： | TPS40051PWPR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 0.2 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封装： | GREEN, PLASTIC, HTSSOP-16 |
| 文件页数： | 13/36页 |
| 文件大小： | 648K |
| 代理商： | TPS40051PWPR |
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TPS40050
TPS40051
TPS40053
SLUS540F DECEMBER 2002 REVISED JUNE 2004
www.ti.com
20
APPLICATION INFORMATION
The maximum allowable power dissipation in the MOSFET is determined by equation (34).
P
T +
T
J * TA
q
JA
(Watts)
where:
P
T + PCOND ) PSW(fsw)
(Watts)
and
θJA 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 (29) and the RMS current through the synchronous rectifier MOSFET is described in
equation (36).
I
RMS + IO
1
* d
Amperes
RMS
The body-diode conduction losses are due to forward conduction of the body diode during the anticross
conduction delay time. The body diode conduction losses are described by equation (37).
P
DC + 2
I
O
V
F
t
DELAY
f
SW
(Watts)
where:
D VF is the body diode forward voltage
D 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).
P
RR + 0.5
Q
RR
V
IN
f
SW
(Watts)
where:
D QRR is the reverse recovery charge of the body diode
The QRR is not always described in a MOSFET’s data sheet, but may be obtained from the MOSFET vendor.
The total synchronous rectifier MOSFET power dissipation is described in equation (39).
P
SR + PDC ) PRR ) PCOND
(Watts)
(34)
(35)
(36)
(37)
(38)
(39)
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| TPS40051PWPRG4 | 功能描述:DC/DC 开关控制器 Wide Input Vltg Synch Buck Cntrlr RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| TPS40051-Q1 | 制造商:TI 制造商全称:Texas Instruments 功能描述:WIDE-INPUT SYNCHRONOUS BUCK CONTROLLER |
| TPS40051QPWPRQ1 | 功能描述:DC/DC 开关控制器 AUTO CAT WIDE-INPUT SYNCH BUCK RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| TPS40052 | 制造商:TI 制造商全称:Texas Instruments 功能描述:WIDE INPUT SYNCHRONOUS BUCK CONTROLLER |
| TPS40052PWP | 功能描述:DC/DC 开关控制器 Wide Input Sync Buck Cntrlr w/DDR trking RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
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