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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： | 21/45页 |
| 文件大小： | 917K |
| 代理商： | TPS40200HD |
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S
(
X
K
S
K
T
LC
PWM
EA
FB
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PWM
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vc
+
-
d
X
LC
V
ref
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FB
Tv(s)
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SGLS400B – OCTOBER 2009 – REVISED MAY 2010
www.ti.com
Frequency Compensation
The four elements that determine the system overall response are discussed in the following paragraphs. The
gain of the error amplifier (KEA) is the first of three elements. Its output develops a control voltage, which is the
input to the PWM.
The TPS40200 has a unique modulator that scales the peak-to-peak amplitude of the PWM ramp to be 0.1 times
the value of the input voltage. Since modulator gain is given by VIN divided by VRAMP, the modulator gain is 10
and is constant at 10 (20 dB) over the entire specified input voltage range.
The last two elements that affect system gain are the transfer characteristic of the output LC filter and the
feedback network from the output to the input to the error amplifier.
These four elements may be expressed by the following expression that represents the system transfer function
(see Figure 37).
(19)
Where:
KFB = Output voltage setting divider
KEA = Error amplifier feedback
KPWM = Modulator gain
XLC = Filter transfer function
Figure 37. Control Loop
28
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 |
参数描述 |
|---|---|
| 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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