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參數(shù)資料
| 型號： | TPS2552DRVR-1 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO6 |
| 封裝： | GREEN, PLASTIC, SON-6 |
| 文件頁數(shù)： | 14/32頁 |
| 文件大?。?/td> | 1025K |
| 代理商： | TPS2552DRVR-1 |
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OUT
IN
GND
FAULT
ILIM
EN
ControlSignal
Input
Fault Signal
PowerPad
Output
CurrentLimit
ControlSignal
0.1 F
m
R
100k
FAULT
W
CLOAD
RLOAD
R1
210kW
R2
22.1kW
Q1
2N7002
SLVS841D
– NOVEMBER 2008 – REVISED JUNE 2011
TWO-LEVEL CURRENT-LIMIT CIRCUIT
Some applications require different current-limit thresholds depending on external system conditions. Figure 27
shows an implementation for an externally controlled, two-level current-limit circuit. The current-limit threshold is
set by the total resistance from ILIM to GND (see the Programming the Current-Limit Threshold section). A
logic-level input enables/disables MOSFET Q1 and changes the current-limit threshold by modifying the total
resistance from ILIM to GND. Additional MOSFET/resistor combinations can be used in parallel to Q1/R2 to
increase the number of additional current-limit levels.
NOTE
ILIM should never be driven directly with an external signal.
Figure 27. Two-Level Current-Limit Circuit
Copyright
2008–2011, Texas Instruments Incorporated
21
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