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R0487YS10F PDF预览

R0487YS10F

更新时间: 2024-02-03 23:48:54
品牌 Logo 应用领域
力特 - LITTELFUSE /
页数 文件大小 规格书
12页 385K
描述
Silicon Controlled Rectifier,

R0487YS10F 技术参数

生命周期:ActiveReach Compliance Code:compliant
风险等级:5.68Base Number Matches:1

R0487YS10F 数据手册

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WESTCODE An IXYS Company  
Distributed Gate Thyristor types R0487YS10# to R0487YS14#  
15.0 Reverse Recovery Loss  
15.1 Determination by Measurement  
From waveforms of recovery current obtained from a high frequency shunt (see Note 1, Page 5) 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 heat sink temperature can  
then be evaluated from the following:  
TK (new) = TK (original ) E  
(
k + f Rth  
)
(
JK  
)
Where k=0.227 (°C/W)/s  
E = Area under reverse loss waveform per pulse in joules (W.s.)  
f = rated frequency Hz at the original heat sink temperature.  
Rth(JK) = d.c. thermal resistance (°C/W).  
The total dissipation is now given by:  
W(TOT) = W(original) + E f  
15.2 Determination without Measurement  
In circumstances where it is not possible to measure voltage and current conditions, or for design  
purposes, the additional losses E in joules may be estimated as follows.  
Let E be the value of energy per reverse cycle in joules (curves in Figure 9).  
Let f be the operating frequency in Hz  
TK  
= TK  
)
(
E Rth f  
)
(
new  
)
(
original  
Where TK (new) is the required maximum heat sink temperature and  
TK (original) is the heat sink temperature given with the frequency ratings.  
A suitable R-C snubber network is connected across the thyristor to restrict the transient reverse voltage  
to a peak value (Vrm) of 67% of the maximum grade. If a different grade is being used or Vrm is other than  
67% of Grade, the reverse loss may be approximated by a pro rata adjustment of the maximum value  
obtained from the curves.  
NOTE 1- Reverse Recovery Loss by Measurement  
This thyristor has a low reverse recovered charge and peak reverse recovery current. When measuring  
the charge, care must be taken to ensure that:  
(a) a.c. 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  
(c) Measurement of reverse recovery waveform should be carried out with an appropriate critically  
damped snubber, connected across diode anode to cathode. The formula used for the calculation  
of this snubber is shown below:  
Vr  
= Commutating source voltage  
Vr  
R2 = 4  
Where: CS = Snubber capacitance  
di  
CS  
R
= Snubber resistance  
dt  
Data Sheet. Type R0487YS10# to R0487YS14# Issue 3  
Page 5 of 12  
October, 2004  

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