U2100B-XFPG3Y ATMEL Corporation, U2100B-XFPG3Y Datasheet - Page 5

• Manufacturer Part Number: U2100B-XFPG3Y
• Description: Timer Control for Triac and Relay
• Manufacturer: ATMEL Corporation

3.1
3.2
4769C–INDCO–07/05
Mode Selection Pin 4 and Supply Voltage Pin 2
Zero Voltage Switch Operation
The operational modes can be selected by the external voltage at the synchronous input pin 4
(clamping). The mode selection determines the current requirement of the relay's or triac's driver
stage and hence the selection of the supply voltage.
Selection condition:
V
I
where:
I
I
I
V
Required firing pulse width t
where:
I
P
R
t
R
tot
S
P
X
L
p
4
M
1
sync
=
= I
= internal synchronous limitation, without external clamping
2 -- -
[k
S
0.85
arcsin
+ I
p
V
-------------------- -
+ I
M
2 I
V
-------------------------------------------------------------------------------- - 176
–
I
-------------------
P
M
tot
X
L
= Supply current of the IC without load
= Average trigger current I
= External circuit current requirement
= Mains voltage
= Triac latching current
= Power at load Z
V
[V]
S
V
M
2
2sin
1.8
(Figure 3-3 on page
10
p
-2
t
p
[s]
–
0.7
–
G
6)
U2100B
5