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參數(shù)資料
| 型號： | ZN423 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | TV 41C 41#20 SKT WALL RECP |
| 中文描述： | 高精度電壓基準源 |
| 文件頁數(shù)： | 5/8頁 |
| 文件大小： | 240K |
| 代理商： | ZN423 |
ZN423
4
Fig.7 0V to 12V, 1A power supply
0V to 12V, 1A Power Supply
The circuit of Fig.7 provides a continuously variable, highly
stable voltage for load currents up to 1A. The output voltage
is given by:
(VR5 + VR6)
and is controlled by VR5 and VR6 which should be high
quality components (preferably wire wound).
The emitter follower stages TR1 and TR2 buffer the
bias and reference from the output stages. The negative
rail allows the output to operate down to 0V.
The current limit stage monitors output current through
R15. As the potential across R15 increases due to load
current, TR4 conducts and supplies base current for TR3,
thus diverting part of the output from the ZN424P via TR3
to TR5.
Shaping is achieved by the network C5, R8 together
with the output decoupling capacitors which also maintain
low output resistance at frequencies above 100kHz.
The power supply has the following performace
characteristics:
Output noise and ripple (full load) <100
μ
V rms
Output resistance (0 to 1A) 1M
Temperature coefficient
±
100ppm/
°
C
Variable 100mA to 2A Current Source
In the circuit of Fig.8 the output current is set by the resistor
R in the collector of TR2, which may be switched to offer a
range of output currents from 100mA to 2A with fine control by
means of VR3 which varies the reference voltage to the non-
inverting input of the ZN424P.
The feedback path from the output to the inverting input of
the ZN424P maintains a constant voltage across R, equal to
(V
CC
- V
IN
) and hence a constant current to the load given by
(V
CC
- V
IN
)/R.
V
O
= R4
REF
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