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| 型号： | TPS40022PWPR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 0.01 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封装： | POWERPAD, PLASTIC, HTSSOP-16 |
| 文件页数： | 29/29页 |
| 文件大小： | 337K |
| 代理商： | TPS40022PWPR |
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TPS40020
TPS40021
TPS40022
SLUS535 – MARCH 2003
www.ti.com
9
APPLICATION INFORMATION
Synchronous Rectification and Predictive Delay
In a normal buck converter, when the main switch turns off, current is flowing to the load in the inductor. This
current cannot be stopped immediately without using infinite voltage. To give this current a path to flow and
maintain voltage levels at a safe level, a rectifier or catch device is used. This device can be either a plain diode,
or it can be a controlled active device if a control signal is available to drive it. The TPS4002X provides a signal
to drive an N–channel MOSFET as a rectifier. This control signal is carefully coordinated with the drive signal
for the main switch so that there is absolute minimum dead time from the time that the rectifier FET turns off
and the main switch turns on, and minimum delay from when the main switch turns off and the rectifier FET
turns on. This TI–patented function, predictive delay, uses information from the current switching cycle to adjust
the delays that are used for the next cycle. Figure 1 shows the switch-node voltage waveform for a
synchronously rectified buck converter. Illustrated are the relative effects of a fixed delay drive scheme
(constant, pre-set delays for the turnoff to turn on intervals), an adaptive delay drive scheme (variable delays
based upon voltages sensed on the current switching cycle) and the predictive delay drive scheme. Note that
the longer the time spent in diode conduction during the rectifier conduction period, the lower the efficiency. Also,
not shown in the figure, is the fact that the predictive delay circuit can actually prevent the body diode from
becoming forward biased at all while at the same time avoiding cross conduction or shoot through. This results
in a significant power savings when the main FET turns on. There is no reverse recovery loss in the body diode
of the rectifier FET.
UDG–01144
GND
Fixed Delay
Adaptive Delay
Predictive Delay
Channel Conduction
Body Diode Conduction
Figure 2. Switch Node Waveforms for Synchronous Buck Converter
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TPS40040 | 制造商:TI 制造商全称:Texas Instruments 功能描述:LOW PIN COUNT, LOW VIN (2.5 V TO 5.5 V) SYNCHRONOUS BUCK DC-TO-DC CONTROLLER WITH ENABLE |
| TPS40040DRBR | 功能描述:DC/DC 开关控制器 Lo Vin Synch Buck DC/DC 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 |
| TPS40040DRBRG4 | 功能描述:DC/DC 开关控制器 Lo Vin Synch Buck DC/DC 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 |
| TPS40040DRBT | 功能描述:DC/DC 开关控制器 Low Vin Synch Buck DC/DC Controller 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 |
| TPS40040DRBT | 制造商:Texas Instruments 功能描述:Peak Reflow Compatible (260 C):Yes |
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