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參數(shù)資料
| 型號： | UA7808 |
| 英文描述： | GENERAL PURPOSE SINGLE BIPOLAR TIMERS |
| 中文描述： | 8V的。 1.5A的固定正電壓穩(wěn)壓器 |
| 文件頁數(shù)： | 8/12頁 |
| 文件大?。?/td> | 250K |
| 代理商： | UA7808 |
μ
A7800 SERIES
POSITIVE-VOLTAGE REGULATORS
SLVS056J
–
MAY 1976
–
REVISED MAY 2003
8
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
μ
A7815C
0.1
μ
F
1N4001
0.1
μ
F
1N4001
0.33
μ
F
2
μ
F
1N4001
1N4001
VO = 15 V
VO =
–
15 V
20-V Input
–
20-V Input
μ
A7915C
1
μ
F
Figure 5. Regulated Dual Supply
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.
μ
A78xx
+VO
+VI
–
VO
1N4001
or
Equivalent
Figure 6. Output Polarity-Reversal-Protection Circuit
reverse-bias protection
Occasionally, the input voltage to the regulator can collapse faster than the output voltage. This can occur, for
example, 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 used as shown in Figure 7.
μ
A78xx
+VO
VI
Figure 7. Reverse-Bias-Protection Circuit
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| UA7808C | 制造商:Texas Instruments 功能描述: |
| UA7808CKC | 功能描述:線性穩(wěn)壓器 - 標(biāo)準(zhǔn) 8.0V 1500mA RoHS:否 制造商:STMicroelectronics 輸出類型: 極性: 輸出電壓:1.8 V 輸出電流:150 mA 負(fù)載調(diào)節(jié): 最大輸入電壓:5.5 V 線路調(diào)整率: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOT-323-5L |
| UA7808CKC3 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Positive Fixed Voltage Regulator |
| UA7808CKCE3 | 功能描述:線性穩(wěn)壓器 - 標(biāo)準(zhǔn) 8V 1.5A Fixed Pos Voltage Regulator RoHS:否 制造商:STMicroelectronics 輸出類型: 極性: 輸出電壓:1.8 V 輸出電流:150 mA 負(fù)載調(diào)節(jié): 最大輸入電壓:5.5 V 線路調(diào)整率: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOT-323-5L |
| UA7808CKCS | 功能描述:線性穩(wěn)壓器 - 標(biāo)準(zhǔn) Positive V RoHS:否 制造商:STMicroelectronics 輸出類型: 極性: 輸出電壓:1.8 V 輸出電流:150 mA 負(fù)載調(diào)節(jié): 最大輸入電壓:5.5 V 線路調(diào)整率: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOT-323-5L |
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