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參數資料
| 型號： | TPS2561DRC |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO10 |
| 封裝： | GREEN, SON-10 |
| 文件頁數： | 8/24頁 |
| 文件大小： | 942K |
| 代理商： | TPS2561DRC |
IN
GND
FAULT1
ILIM
EN1
RILIM
20 k
RFAULT
2x 100 k
Input
TPS2561
0.1 F
Power Pad
CRETRY
2x 0.22 F
FAULT2
EN2
VOUT1
VOUT2
2x CLOAD
OUT1
OUT2
IN
GND
FAULT1
ILIM
EN1
RILIM
20 k
RFAULT
2x 100 k
Input
TPS2561
0.1 F
Power Pad
CRETRY
2x 0.22 F
FAULT2
EN2
External Logic
Signal & Drivers
VOUT1
VOUT2
2x CLOAD
OUT1
OUT2
SLVS930 – DECEMBER 2009
www.ti.com
AUTO-RETRY FUNCTIONALITY
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, FAULTx pulls ENx low disabling the part. The part is disabled when ENx is
pulled below the turn-off threshold, and FAULTx goes high impedance allowing CRETRY to begin charging. The
part re-enables when the voltage on ENx reaches the turn-on 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 19. Auto-Retry Functionality
Some applications require auto-retry functionality and the ability to enable/disable with an external logic signal.
The figure below 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 20. Auto-Retry Functionality With External EN Signal
16
Copyright 2009, Texas Instruments Incorporated
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