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| 型号： | TPS2552DRV-1 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO6 |
| 封装： | PLASTIC, SON-6 |
| 文件页数： | 13/32页 |
| 文件大小： | 2005K |
| 代理商： | TPS2552DRV-1 |
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AUTO-RETRY FUNCTIONALITY
OUT
IN
GND
FAULT
ILIM
EN
Input
PowerPad
Output
0.1 F
m
R
100k
FAULT
W
C
0.1 F
RETRY
m
R
20k
ILIM
W
CLOAD
RLOAD
TPS2553
OUT
IN
GND
FAULT
ILIM
EN
ExternalLogic
Signal & Driver
PowerPad
Output
Input
0.1 F
m
R
100k
FAULT
W
C
0.1 F
RETRY
m
R
20k
ILIM
W
CLOAD
RLOAD
TPS2553
SLVS841C – NOVEMBER 2008 – REVISED SEPTEMBER 2009...................................................................................................................................... www.ti.com
Some applications require that an overcurrent condition disables the part momentarily during a fault condition
and re-enables after a pre-set time. This auto-retry functionality can be implemented with an external resistor and
capacitor. During a fault condition, FAULT pulls low disabling the part. The part is disabled when EN is pulled
low, and FAULT goes high impedance allowing CRETRY to begin charging. The part re-enables when the voltage
on EN reaches the turnon threshold, and the auto-retry time is determined by the resistor/capacitor time
constant. The part will continue to cycle in this manner until the fault condition is removed.
Figure 25. Auto-Retry Functionality
Some applications require auto-retry functionality and the ability to enable/disable with an external logic signal.
Figure 26 shows how an external logic signal can drive EN through RFAULT and maintain auto-retry functionality.
The resistor/capacitor time constant determines the auto-retry time-out period.
Figure 26. Auto-Retry Functionality With External EN Signal
20
Copyright 2008–2009, Texas Instruments Incorporated
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