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参数资料
| 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： | 2/29页 |
| 文件大小： | 337K |
| 代理商： | TPS40022PWPR |
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TPS40020
TPS40021
TPS40022
SLUS535 – MARCH 2003
www.ti.com
10
APPLICATION INFORMATION
Overcurrent
Overcurrent in the TPS4002X is sensed by looking at the voltage across the main FET while it is on. If the
voltage exceeds a pre-set threshold, the current pulse is terminated, and a counter inside the device is
incremented. If this counter fills up, a fault condition is declared and the chip disables switching for a period of
time and then attempts to restart the converter with a full soft-start cycle. The more detailed explanation follows.
In each switching cycle, a comparator looks at the voltage across the top side FET while it is on. If the voltage
across that FET exceeds a programmable threshold voltage, then the current switching pulse is terminated and
a 3-bit counter (eight counts) is incremented by one count. If during the switching cycle the top side FET voltage
does not exceed a preset threshold, then this counter is decremented by one count. (The counter does not wrap
around from seven to zero or from zero to seven). If the counter reaches a full count of seven, the device
declares that a fault condition exists at the output of the converter. In this state, switching stops and the soft-start
capacitor is discharged. The counter is decremented by one by the soft start cap discharge. When the soft-start
capacitor is fully discharged, the discharge circuit is turned off and the cap is allowed to charge up at the nominal
charging rate, When the soft-start capacitor reaches about 700 mV, it is discharged again and the overcurrent
counter is decremented by one count. The capacitor is charged and discharged, and the counter decremented
until the count reaches zero (a total of six times). When this happens, the outputs are again enabled as the
soft-start capacitor generates a reference ramp for the converter to follow while attempting to restart. During
this soft-start interval (whether or not the controller is attempting to do a fault recovery or starting for the first
time), pulse-by-pulse current limiting is in effect, but overcurrent pulses are not counted to declare a fault until
the soft-start cycle has been completed. It is possible to have a supply try to bring up a short circuit for the
duration of the soft start period plus seven switching cycles. Power stage designs should take this into account
if it makes a difference thermally. Figure 3 shows the details of the overcurrent operation.
UDG–03029
(+)
VTS
(–)
Internal PWM
VTS
0 V
External
Main Drive
Normal Cycle
Overcurrent
Threshold
Voltgage
Overcurrent
Cycle
Figure 3. 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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