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| 型号： | TPS40052PWP |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封装： | GREEN, PLASTIC, HTSSOP-16 |
| 文件页数： | 8/33页 |
| 文件大小： | 753K |
| 代理商： | TPS40052PWP |
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TPS40052
SLUS563C AUGUST 2003 REVISED FEBRUARY 2005
16
www.ti.com
APPLICATION INFORMATION
The poles and zeros for a type III network are described in equations (21).
f
Z1 +
1
2
p
R2
C1
(Hertz)
f
Z2 +
1
2
p
R1
C3
(Hertz)
f
P1 +
1
2
p
R2
C2
(Hertz)
f
P2 +
1
2
p
R3
C3
(Hertz)
The value of R1 is somewhat arbitraty, but influences other component values. A value between 50k
and
100k
usually yields reasonable values.
The unity gain frequency is described in equation (22)
f
C +
1
2
p
R1
C2
G
(Hertz)
where G is the reciprocal of the modulator gain at fC.
The modulator gain as a function of frequency at fC, is described in equation (23).
AMOD(f)
+ AMOD
f
LC
f
C
2
and
G
+
1
AMOD(f)
Minimum Load Resistance
Care must be taken not to load down the output of the error amplifier with the feedback resistor, R2, that is too
small. The error amplifier has a finite output source and sink current which must be considered when sizing R2.
Too small a value does not allow the output to swing over its full range.
R2
(MIN) +
V
C(max)
I
SOURCE (min)
+ 3.45 V
2mA
+ 1725 W
CALCULATING THE BOOST AN BP10 BYPASS CAPACITOR
The BOOST capacitance provides a local, low impedance source for the high-side driver. The BOOST capacitor
should be a good quality, high-frequency capacitor. The size of the bypass capacitor depends on the total gate
charge of the MOSFET and the amount of droop allowed on the bypass capacitor. The BOOST capacitance
is described in equation (25).
C
BOOST +
Qg
DV
(Farads)
The 10-V reference pin, BP10V needs to provide energy for both the synchronous MOSFET and the high-side
MOSFET via the BOOST capacitor. Neglecting any efficiency penalty, the BP10V capacitance is described in
equation (26).
C
BP10 +
Q
gHS ) QgSR
DV
(Farads)
(21)
(22)
(23)
(24)
(25)
(26)
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相关代理商/技术参数 |
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|---|---|
| TPS40052PWPG4 | 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 |
| TPS40052PWPR | 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 |
| TPS40052PWPRG4 | 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 |
| TPS40053 | 制造商:TI 制造商全称:Texas Instruments 功能描述:WIDE-INPUT SYNCHRONOUS BUCK CONTROLLER |
| TPS40053PWP | 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 |
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