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參數(shù)資料
| 型號(hào)： | ZN423 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | TV 41C 41#20 SKT WALL RECP |
| 中文描述： | 高精度電壓基準(zhǔn)源 |
| 文件頁(yè)數(shù)： | 4/8頁(yè) |
| 文件大?。?/td> | 240K |
| 代理商： | ZN423 |
ZN423
3
Fig.5 5V, 0.5A power supply
APPLICATIONS
5V, 0.5A Power Supply
The circuit shown in Fig.5 is essentially a constant current
source modified by the feedback components R2 and R3 to
give a constant voltage output.
The output of the ZN424P need only be 2V above the
negative rail, by placing the load in the collector of the output
transistor TR2. Current control is achieved by TR1 and R5.
The simple circuit has the following performance
characteristics:
Output noise and ripple (full load) = 1mV rms
Load regulation (0 to 0.5A) = 0.1%
Temperature coefficient =
±
100ppm/
°
Current limit = 0.65A
5V, 1.0A Power Supply
The circuit detailed in Fig.6 provides improved
performance over that in Fig.5. This is achieved by feeding the
ZN423 reference and the ZN424P error amplifier from a more
stable source, derived from the emitter-follower stage (TR1).
The supply rejection ratio is improved by the factor R1/R5,
where R5 is the slope resistance of the ZN423.
The output voltage is given by:
(R3 + R4)
R3
and may be adjusted by replacing R3 with a 220 and a 500
preset potentiometer.
The output is protected against short circuits by TR2
setting a current limit of 1.6A.
V
REF
Fig.6 5V, 1.0A power supply
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