# T2117

Manufacturer Part NumberT2117
DescriptionStandard Zero Crossing Switch, Low-cost Application
ManufacturerATMEL Corporation
T2117 datasheet

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whereby:
I
=
Latching current of the triac
L
V
=
Mains supply, effective
M
P
=
Power load (user’s power)
Total current consumption is influenced by the firing
pulse width which can be calculated as follows:
t p
) * 0.6 V
V
2 sin (w
+
M
2
R
* 5
sync
3.5
10
A
10.00
V
= 230 V
Mains
1.00
0.10
0.01
10
100
1000
P ( W )
Figure 5. Output pulse width
2000
V
= 230 V
Mains
1600
1200
800
400
0
0
200
400
600
800 1000 1200 1400
tp ( ms )
Figure 6. Synchronization resistance
Supply Voltage
The T2117 contains voltage limiting and can be con-
nected with the mains supply via the diode D
resistor R
. Supply voltage between Pin 5 and 7 is limited
1
to a typical value of 9.5 V.
Rev. A2, 17-Dec-01
The series resistance R
and 8) as follows:
R
= 0.85
1max
I
= I
+ I
tot
S
* 49 kW
whereby:
V
= Mains voltage
M
V
= Limiting voltage of the IC
S
I
= Total current consumption
tot
I
= Current requirement of the IC (without load)
S
I
= Current requirement of other peripheral
x
components
P
= Power dissipation at R
(R1)
50
I
( mA)
L
40
200
100
30
50
10000
20
10
0
0
Figure 7. Maximum resistance of R
6
5
4
3
2
1
0
0
and the
1
T2117
can be calculated (figures 7
1
V
V
(V
V
Mmin –
Smax
M –
; P
=
(R1)
2 I
tot
2 R
1
+ I
P
x
1
V
=230VX
Mains
15
3
6
9
12
I
( mA )
tot
1
V
=230VX
Mains
15
3
6
9
12
I
( mA )
tot
Figure 8. Power dissipation of R
1
according to current consumption
2
)
S
3 (11)