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| 型号： | TPS40021PWPG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 0.01 A SWITCHING CONTROLLER, 1100 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封装： | GREEN, PLASTIC, HTSSOP-16 |
| 文件页数： | 3/36页 |
| 文件大小： | 724K |
| 代理商： | TPS40021PWPG4 |
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TPS40020
TPS40021
SLUS535D MARCH 2003 REVISED JULY 2007
www.ti.com
11
APPLICATION INFORMATION
Output Short Circuit Protection
Output short circuit protection 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 approximately 1.3 V, 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.
UDG03029
(+)
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 |
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| TPS40021PWPR | 功能描述:DC/DC 开关控制器 Low Input Sync Buck Cntrlr source/sink 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 |
| TPS40021PWPRG4 | 功能描述:DC/DC 开关控制器 Low Input Sync Buck Cntrlr source/sink 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 |
| TPS40022PWP | 制造商:Texas Instruments 功能描述: |
| 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 |
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