What does the power of a Zener diode mean? Is it reverse leakage current * voltage regulation value? This power is generally very small, in the milliwatt level.

QWE4562009

What does the power of a Zener diode mean? Is it reverse leakage current * voltage regulation value? This power is generally very small, in the milliwatt level. [Copy link]

What does the power of a Zener diode mean? Is it reverse leakage current * voltage regulation value? This power is generally very small, in the milliwatt level.

qwqwqw2088

There is something wrong with the landlord's statement

The PD parameters listed in the table are the power dissipation of the Zener diode. The power dissipation refers to the power actually consumed by the Zener diode during actual operation, and this power will be converted into heat.

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PD is the power. The smaller the dissipation power, the less energy loss and the higher the efficiency of the circuit. Therefore, when designing a high-efficiency circuit, we will try to choose a Zener diode with low dissipation power.

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The power of the Zener diode in the title should be the rated power consumption (Pz)

Rated power dissipation (Pz) is the maximum power that a Zener diode can withstand under normal working conditions. It is the maximum power value that a Zener diode can withstand and is a fixed parameter.

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It is the title. The red box is the rated power PZ

The parameter in the table is Pd

When actually selecting a Zener diode and designing a circuit, ensure that the operating conditions of the Zener diode do not cause its dissipated power Pd to exceed the rated power consumption Pz to avoid overheating and damage to the diode.

QWE4562009

qwqwqw2088 posted on 2024-7-10 21:42 It is the title. The red box is the rated power PZ. The parameter in the table is Pd. In the actual selection of the voltage regulator diode...

Isn't the voltage regulator working in reverse breakdown state?

QWE4562009

qwqwqw2088 posted on 2024-7-10 21:29 The original poster's statement is problematic. The table listed in the PD parameter is the power dissipation of the Zener diode. The power dissipation refers to the actual power dissipation of the Zener diode during actual operation...

How do you calculate the operating rating? Reverse breakdown voltage multiplied by reverse leakage current?

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QWE4562009 posted on 2024-7-12 14:51 Doesn't the voltage regulator work in the reverse breakdown state?

It is working in reverse breakdown state

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QWE4562009 posted on 2024-7-12 14:53 How to calculate the rated working voltage? Reverse breakdown voltage multiplied by reverse leakage current?

It has been said above

The rated power of the Zener diode is understood as the maximum allowable power consumption.

It refers to the maximum power that can be safely tolerated under specific conditions.

This power value is not calculated by you, but is given by the manufacturer in the data sheet in watts (W).

The rated power is the maximum power limit at which the diode can operate stably for a long time without being damaged.

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QWE4562009 posted on 2024-7-12 14:53 How to calculate the rated working voltage? Reverse breakdown voltage multiplied by reverse leakage current?

Understand dissipated power as power consumption,

QWE4562009

qwqwqw2088 posted on 2024-7-12 15:48 As mentioned above, the rated power of the Zener diode is understood as the maximum allowable power consumption. It means...

The voltage regulator works in the reverse breakdown state. The power is the reverse current multiplied by the voltage regulator.