Selection of Zener diode should pay attention to several principles
Author: Shenzhen Yuan Zhi Electronics Co., Ltd.Time:2018-03-01 17:15:36Views:1403【SML】
Zener
diode is working in reverse breakdown state, so that the voltage across
the tube is essentially the same as a special diode. Selection
of regulator, according to the specific electronic circu...
label:
Zener
diode is working in reverse breakdown state, so that the voltage across
the tube is essentially the same as a special diode. Selection
of regulator, according to the specific electronic circuit to consider,
a simple parallel power supply, the output voltage is the regulator
voltage regulator. Transistor radio regulator power supply optional 2CW54-type regulator, the steady voltage of 6.5V can be.
The
use of regulator should be noted that the diode reverse current can not
be infinitely increased, otherwise it will lead to overheating diode
damage. Therefore, the regulator in the circuit to be generally in series current limiting resistor. In
the selection of regulator, such as the need to regulate the value of
the larger pipe, maintenance site and not available for a few
low-voltage regulator in series with the use of the tube; when the need
to lower the value of the tube and can not buy, you can With ordinary silicon diode conduction instead of the regulator used. For example, with two 2CZ82A silicon diodes in series, can be used as a
1.4V regulator; but the regulator is generally not used in parallel.
In the tape recorders, color TV's voltage regulator circuit, you can choose 1N4370 type, 1N746-1N986 Series Zener diode. For
example 1N966 type tube (2CW8) has a stable voltage of 16V, a dynamic
resistance of 17Ω, a temperature coefficient of voltage of 0.09.1N975
type (2CW71), a steady voltage of 39V, a dynamic resistance of 80Ω, a
reverse test current of 3.0mA, Current is 5uA, power consumption is 500mw.
Regulators
of the variability of large discrete value, even if the same
manufacturer of the same model of the stable voltage value is not
exactly the same, which should be added attention in the selection. For the higher requirements of the circuit before the value of the regulator should be tested.
China's domestic regulator there are three electrodes, such as 2DW7 regulator. This
regulator is the two Zener diode symmetrical package with each other,
so that the temperature coefficient of the two regulator offset each
other to improve the stability of the tube. The three electrodes of the regulator tube shape is like a transistor, the choice of time to be distinguished.
2018-03-01
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