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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： | 24/45页 |
| 文件大小： | 917K |
| 代理商： | TPS40200HD |
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SGLS400B – OCTOBER 2009 – REVISED MAY 2010
www.ti.com
In order to properly compensate this system, it is necessary to know the frequencies of its poles and zeros.
Step 1
The break frequency of the output capacitor is given by:
(20)
Where:
L = 33 mH
C = 221 mF
Because of the ESR of the output capacitor, this output filter has a single-pole response above the 1.8-kHz break
frequency of the output capacitor and its ESR. This simplifies compensation since the system becomes
essentially a single-pole system.
Step 2
The first zero is place well below the 1.8-kHz break frequency of the output capacitor and its ESR. Phase boost
from this zero is shown in Figure 40.
(21)
Where:
R8 = 100 k
C8 = 1500 pF
FZ1 = 354 Hz
Step 3
From a minimum gain bandwidth product of 1.5 MHz, and knowing it has a 20-dB/decade rolloff, the gain of the
error amplifier is 33 dB at 35 kHz. This approximate frequency is chosen for a crossover frequency to keep the
amplifier gain contribution to the overall system gain small.
Step 4
The second zero is placed well above the 35-kHz crossover frequency.
(22)
Where:
R8 = 300 k
C7 = 10 pF
C8 = 1500 pF
fP3 = 53 kHz
30
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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