參數(shù)資料
型號(hào): T2117-3ASY
廠商: ATMEL CORP
元件分類: 模擬信號(hào)調(diào)理
英文描述: SPECIALTY ANALOG CIRCUIT, PDIP8
封裝: LEAD FREE, DIP-8
文件頁數(shù): 11/16頁
文件大?。?/td> 256K
代理商: T2117-3ASY
4
4768B–INDCO–10/05
T2117
4.
Triac Firing Current (Pulse)
This depends on the triac requirement. It can be limited by the gate series resistance which is
calculated as follows:
where:
V
G
= Gate voltage
I
Gmax = Maximum gate current
I
p
= Average gate current
t
p
= Firing pulse width
T
= Mains period duration
5.
Firing Pulse Width t
p
This depends on the latching current of the triac and its load current. The firing pulse width is
determined by the zero-crossing detection which can be influenced by the synchronous resis-
tance, R
where
I
L
= Latching current of the triac
V
M
= Mains supply, effective
P
= Load power
The total current consumption is influenced by the firing pulse width which can be calculated as
follows:
R
Gmax
7.5 V
V
Gmax
I
Gmax
------------------------------------
36
I
P
I
Gmax
T
--------------
t
p
×
=
t
p
2
ω
--- arc. sin
I
L
V
M
×
P2
-------------------
=
R
sync
V
M
2 sin
ω
t
p
2
----
×
0.6 V
3.5
10
-5
A
×
------------------------------------------------------------------
49 k
=
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