参数资料
| 型号： | UA78L05AIDRG4 |
| 厂商： | Texas Instruments |
| 文件页数： | 9/28页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 5V .1A 8SOIC |
| 标准包装： | 2,500 |
| 稳压器拓扑结构： | 正，固定式 |
| 输出电压： | 5V |
| 输入电压： | 7 V ~ 20 V |
| 电压 - 压降（标准）： | 1.7V @ 40mA |
| 稳压器数量： | 1 |
| 电流 - 输出： | 100mA（最小值） |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOIC |
| 包装： | 带卷 (TR) |
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1N4001
SLVS010U – JANUARY 1976 – REVISED MAY 2011
20-V Input
0.33 μF
μA78L15
0.1 μF
1N4001
V O = 15 V
0.33 μF
0.1 μF
1N4001
-20-V Input
μA79L15
V O = -15 V
1N4001
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 (for example, operational amplifiers, level-shifting circuits, and so on). 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.
V I
μA78Lxx
V O
1N4001
or
Equivalent
-V O
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
V I
μA78Lxx
V O
Figure 7. Reverse-Bias-Protection Circuit
Copyright ? 1976–2011, Texas Instruments Incorporated
9
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