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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： | 5/45页 |
| 文件大小： | 917K |
| 代理商： | TPS40200HD |
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www.ti.com
SGLS400B – OCTOBER 2009 – REVISED MAY 2010
GENERAL INFORMATION
Overview
The TPS40200 is a nonsynchronous controller with a built-in 200-mA driver, designed to drive high-speed
P-channel FETS up to 500 kHz. Its small size combined with complete functionality makes the part both versatile
and easy to use.
The controller uses a low-value current-sensing resistor in series with the input voltage and the power FET
source connection to detect switching current. When the voltage drop across this resistor exceeds 100 mV, the
part enters a hiccup fault mode at approximately 2% of the operating frequency.
The part uses voltage feedback to an error amplifier that is biased by a precision 700-mV reference.
Feed-forward compensation from the input keeps the pulse-width modulator (PWM) gain constant over the full
input voltage range, eliminating the need to change frequency compensation for different input voltages.
The part also incorporates a soft-start feature where the output follows a slowly rising soft-start voltage,
preventing output-voltage overshoot.
Programming the Operating Frequency
The operating frequency of the controller is determined by an external resistor, RRC, that is connected from the
RC pin to VDD and a capacitor attached from the RC pin to ground. This connection, and the two oscillator
comparators inside the IC, are shown in Figure 24. The oscillator frequency can be calculated from the following
equation:
(1)
Where:
fSW = Clock frequency
RRC = Timing resistor value (in )
CRC = Timing capacitor value (in F)
RRC must be kept large enough that the current through it does not exceed 750 mA when the internal switch
(shown in Figure 24) is discharging the timing capacitor. This condition may be expressed by:
(2)
Synchronizing the Oscillator
Figure 24 shows the functional diagram of the TPS40200 oscillator. When synchronizing the oscillator to an
external clock, RC must be pulled below 150 mV for 20 ns or more. The external clock frequency must be higher
than the free-running frequency of the converter as well. When synchronizing the controller, if RC is held low for
an excessive amount of time, erratic operation may occur. The maximum amount of time that RC should be held
low is 50% of a nominal output pulse, or 10% of the period of the synchronization frequency.
Under circumstances where the input voltage is high and the duty cycle is less than 50%, a Schottky diode
connected from RC to an external clock may be used to synchronize the oscillator. The cathode of the diode is
connected to RC. The trip point of the oscillator is set by an internal voltage divider to be 1/10 of the input
voltage. The clock signal must have an amplitude higher than this trip point. When the clock goes low, it allows
the reset current to restart the RC ramp, synchronizing the oscillator to the external clock. This provides a simple,
single-component method for clock synchronization.
Copyright 2009–2010, Texas Instruments Incorporated
13
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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