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參數(shù)資料
| 型號： | μA78L09 |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | General Purpose, Low Current Positive-Voltage Regulator(9V,通用小電流正電壓穩(wěn)壓器) |
| 中文描述： | 通用型，低電流正電壓穩(wěn)壓器（9伏，通用小電流正電壓穩(wěn)壓器） |
| 文件頁數(shù)： | 9/10頁 |
| 文件大?。?/td> | 251K |
| 代理商： | ΜA78L09 |
uA78L00 SERIES
POSITIVE-VOLTAGE REGULATORS
SLVS010C – JANUARY 1976 – REVISED NOVEMBER 1991
9
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
uA78Lxx
VO
VI
– VO
1N4001
or
Equivalent
Figure 6. Output Polarity-Reversal Protection Circuit
operation with a load common to a voltage of opposite polarity
In many cases, a regulator powers a load that is not connected to ground but instead is connected to a voltage
source of opposite polarity (e.g., operational amplifiers, level-shifting circuits, etc.). In these cases, a clamp
diode should be connected to the regulator output as shown in Figure 6. This protects the regulator from output
polarity reversals during startup and short-circuit operation.
uA78Lxx
VO
VI
Figure 7. Reverse-Bias Protection Circuit
reverse-bias protection
Occasionally, there exists the possibility that the input voltage to the regulator can collapse faster than the output
voltage. This could occur, for example, if the input supply is crowbarred during an output overvoltage condition.
If the output voltage is greater than approximately 7 V, the emitter-base junction of the series pass element
(internal or external) could break down and be damaged. To prevent this, a diode shunt can be employed, as
shown in Figure 7.
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