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S2008V12V 参数 Datasheet PDF下载

S2008V12V图片预览
型号: S2008V12V
PDF下载: 下载PDF文件 查看货源
内容描述: 晶闸管产品目录 [Thyristor Product Catalog]
分类和应用:
文件页数/大小: 224 页 / 2673 K
品牌: TECCOR [ TECCOR ELECTRONICS ]
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AN1002  
AN1002  
Gating, Latching, and Holding of SCRs and Triacs  
Triacs (bilateral devices) can be gated on with a gate signal of  
either polarity with respect to the MT1 terminal; however, differ-  
Introduction  
Gating, latching, and holding currents of thyristors are some of  
the most important parameters. These parameters and their  
interrelationship determine whether the SCRs and triacs will  
function properly in various circuit applications.  
ent polarities have different requirements of IGT and VGT.  
Figure AN1002.2 illustrates current flow through the triac chip in  
various gating modes.  
This application note describes how the SCR and triac parame-  
ters are related. This knowledge helps users select best operat-  
ing modes for various circuit applications.  
MT1(-)  
Gate(+)  
I
GT  
N
N
P
N
Gating of SCRs and Triacs  
N
QUADRANT I  
Three general methods are available to switch thyristors to  
P
on-state condition:  
I
T
Applying proper gate signal  
Exceeding thyristor static dv/dt characteristics  
Exceeding voltage breakover point  
MT2(+)  
MT1(-)  
Gate(-)  
GT  
I
This application note examines only the application of proper  
gate signal. Gate signal must exceed the IGT and VGT require-  
ments of the thyristor being used. IGT (gate trigger current) is the  
minimum gate current required to switch a thyristor from the off  
state to the on state. VGT (gate trigger voltage) is the voltage  
required to produce the gate trigger current.  
SCRs (unilateral devices) require a positive gate signal with  
respect to the cathode polarity. Figure AN1002.1 shows the cur-  
rent flow in a cross-sectional view of the SCR chip.  
N
N
P
N
QUADRANT II  
P
N
MT2(+)  
Gate(-)  
MT1(+)  
I
GT  
Gate  
(+)  
Cathode  
(-)  
N
N
P
IGT  
N
QUADRANT III  
QUADRANT IV  
N
P
P
N
I
N
P
MT2(-)  
T
MT1(+)  
Gate(+)  
I
GT  
(+)  
IT  
N
N
P
Anode  
N
Figure AN1002.1  
SCR Current Flow  
P
N
In order for the SCR to latch on, the anode-to-cathode current (IT)  
must exceed the latching current (IL) requirement. Once latched  
on, the SCR remains on until it is turned off when anode-to-cath-  
ode current drops below holding current (IH) requirement.  
I
MT2(-)  
T
Figure AN1002.2  
Triac Current Flow (Four Operating Modes)  
©2002 Teccor Electronics  
Thyristor Product Catalog  
AN1002 - 1  
http://www.teccor.com  
+1 972-580-7777  
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