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| 型号： | TPS40200HD |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封装： | PLASTIC, SOIC-8 |
| 文件页数： | 15/45页 |
| 文件大小： | 917K |
| 代理商： | TPS40200HD |
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l
S
pp
L
t
D
V
I
D
=
D
(
)
OUT
DSON
OUT
IN
I
R
DCR
V
+
-
=
D
(
)
mW
10
t
I
V
2
f
t
I
V
2
f
P
CHOFF
pk
IN
S
CHON
pk
IN
S
SW
=
+
÷
è
=
TH
IN
G
GD
CHON
V
R
Q
t
-
=
IN
G
GD
CHOFF
V
R
Q
t
=
mW
22
f
V
Q
P
S
GATE
G
GATE
=
=
mW
2
f
V
C
P
S
2
MAX
_
IN
OSS
COSS
=
=
SGLS400B – OCTOBER 2009 – REVISED MAY 2010
www.ti.com
Where:
RDSON = FET on-state resistance
DCR = Inductor dc resistance
D = Duty cycle
tS = Reciprocal of the switching frequency
Using the values in this example, the dc power loss is 129 mW. The remaining FET losses are:
PSW – Power dissipated while switching the FET on and off
Pgate – Power dissipated driving the FET gate capacitance
PCOSS – Power switching the FET output capacitance
The total power dissipated by the FET is the sum of these contributions:
PFET = PSW + Pgate + PCOSS + PRDSON
The P-channel FET used in this application is an FDC654P, with the following characteristics:
trise = 13 × 10
–9
COSS = 83 × 10
–12
tfall = 6 × 10
–9
Qg = 9 nC
RDSON = 0.1
Vgate = 1.9 V
Qgd = 1.2 × 10
–9
Qgs = 1.0 × 10
–9
Using these device characteristics and the following formulas produces:
(10)
Where:
and
are the switching times for the power FET.
IG = QG × fS = 2.7 mA is the gate current
The sum of the switching losses is 34 mW and is comparable to the 129-mW dc losses. At added expense, a
slightly larger FET would be better because the dc loss would drop and the ac losses would increase, with both
moving toward the optimum point of equal losses.
22
Copyright 2009–2010, Texas Instruments Incorporated
Product Folder Link(s): TPS40200-HT
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相关代理商/技术参数 |
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|---|---|
| TPS40200-HT | 制造商:TI 制造商全称:Texas Instruments 功能描述:WIDE-INPUT-RANGE NONSYNCHRONOUS VOLTAGE-MODE CONTROLLER |
| TPS40200MDREP | 功能描述:DC/DC 开关控制器 Mil Enhanced Nonsync Vltg-Mode 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 |
| TPS40200MDREPG4 | 功能描述:电压模式 PWM 控制器 EP DC/DC CONTROLLER RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| TPS40200-Q1 | 制造商:TI 制造商全称:Texas Instruments 功能描述:WIDE-INPUT-RANGE NONSYNCHRONOUS VOLTAGE-MODE CONTROLLER |
| TPS40200QDRQ1 | 功能描述:DC/DC 开关控制器 Wide-Inp-Rng Nonsync Vltg-Mode 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 |
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