Datasheet > M0859LC180

M0859LC180

更新时间： 2023-12-06 20:13:06

品牌	Logo	应用领域
力特 - LITTELFUSE		软恢复二极管
页数	文件大小	规格书
12页	658K
描述
我们的软恢复二极管提供多种反向恢复特性，可满足续流和缓冲应用的需求。这些器件可提供高达6kV的阻断电压和高达2413A的平均电流，并采用24mm至75mm直径的硅片。这些器件尤其适用于要求软恢

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M0859LC180 数据手册

Soft Recovery Diode Type M0859LC140 to M0859LC180

5.0 Reverse Recovery Loss

The following procedure is recommended for use where it is necessary to include reverse recovery loss.

From waveforms of recovery current obtained from a high frequency shunt (see Note 1) and reverse

voltage present during recovery, an instantaneous reverse recovery loss waveform must be constructed.

Let the area under this waveform be E joules per pulse. A new sink temperature can then be evaluated

from:

T_SINK=T_{j(MAX )}− E 



k + f  R_thJK

Where k = 0.2314 (°C/W)/s

E = Area under reverse loss waveform per pulse in joules (W.s.)

f = Rated frequency in Hz at the original sink temperature.

R_th(JK)= d.c. thermal resistance (°C/W)

The total dissipation is now given by:

W =W_(original)+ E f

(tot)

NOTE 1 - Reverse Recovery Loss by Measurement

This device has a low reverse recovered charge and peak reverse recovery current. When measuring the

charge, care must be taken to ensure that:

(a) AC coupled devices such as current transformers are not affected by prior passage of high

amplitude forward current.

(b) A suitable, polarised, clipping circuit must be connected to the input of the measuring oscilloscope

to avoid overloading the internal amplifiers by the relatively high amplitude forward current signal.

damped snubber, connected across diode anode to cathode. The formula used for the calculation of this

snubber is shown below:

V_r

C_S

R²= 4

Where: V_r= Commutating source voltage

C_S= Snubber capacitance

R = Snubber resistance

6.0 Snubber Components

When selecting snubber components, care must be taken not to use excessively large values of snubber

capacitor or excessively small values of snubber resistor. Such excessive component values may lead to

device damage due to the large resultant values of snubber discharge current. If required, please consult

the factory for assistance.

Data Sheet. Types M0859LC140 to M0859LC180 Issue 2

Page 4 of 11

December 2018

1 2 345 6 7...12

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