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參數(shù)資料
| 型號(hào)： | TL780-15Y |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | POSITIVE-VOLTAGE REGULATORS |
| 中文描述： | 正電壓調(diào)節(jié)器 |
| 文件頁(yè)數(shù)： | 7/8頁(yè) |
| 文件大?。?/td> | 134K |
| 代理商： | TL780-15Y |
TL780 SERIES
POSITIVE-VOLTAGE REGULATORS
SLVS055F – APRIL 1981 – REVISED DECEMBER 1999
7
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
Figure 2. Positive Regulator in Negative
Configuration (V
I
Must Float)
–VO
GND
IL
VI
–
+
COMMON
In
Out
TL780-xx
Figure 3. Current Regulator
IO
OUTPUT
R1
0.33
μ
F
C1
INPUT
TL780-xx
VO(Reg)
IO = (VO/R1) + IO Bias Current
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 4. This protects the regulator from output
polarity reversals during startup and short-circuit operation.
VI
Equivalent
or
1N4001
–VO
VO
TL780-xx
Figure 4. Output Polarity-Reversal-Protection Circuit
reverse-bias protection
Occasionally, the input voltage to the regulator can collapse faster than the output voltage. This, for example,
could occur when 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 5.
VO
VI
TL780-xx
Figure 5. Reverse-Bias-Protection Circuit
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