AC16DGM Teccor Electronics, AC16DGM Datasheet - Page 122

• Manufacturer Part Number: AC16DGM
• Manufacturer: Teccor Electronics

AN1001
Triac
Basic Operation
Figure AN1001.4 shows the simple block construction of a triac.
Its primary function is to control power bilaterally in an AC circuit.
Figure AN1001.4
Operation of a triac can be related to two SCRs connected in par-
allel in opposite directions as shown in Figure AN1001.5.
Although the gates are shown separately for each SCR, a triac
has a single gate and can be triggered by either polarity.
Figure AN1001.5
Since a triac operates in both directions, it behaves essentially
the same in either direction as an SCR would behave in the for-
ward direction (blocking or operating).
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Terminal 2
(MT2)
Main
Triac Block Construction
SCRs Connected as a Triac
Block Construction
N
P
MT2
MT1
N
Gate
P
Schematic Symbol
N
N
MT1
MT2
Terminal 1
Gate
(MT1)
Main
AN1001 - 2
Geometric Construction
Figure AN1001.6 show simplified cross-sectional views of a triac
chip in various gating quadrants and blocking modes.
Figure AN1001.6
GATE(+)
GATE(-)
GATE(+)
I GT
I GT
I GT
I GT
GATE(-)
QUADRANT IV
QUADRANT III
N
QUADRANT II
QUADRANT I
N
N
N
MT2(-)
P
P
P
P
I T
MT2(-)
MT2(+)
MT2(+)
N
N
N
N
N
MT1(-)
N
MT1(+)
N
MT1(+)
MT1(-)
N
Simplified Cross-sectional of Triac Chip
P
N
P
N
I T
P
N
P
N
I T
Blocking
Junction
Blocking
Junction
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Thyristor Product Catalog
Equivalent Diode
Equivalent Diode
Relationship
Relationship
Application Notes
MT1(+)
MT1(-)
MT2(-)
MT2(+)