S1220PBID Datasheet, PDF (13/18 Pages) ON Semiconductor – Universal Voltage Monitors

MC34161, MC33161, NCV33161
Input
92 Vac to
276 Vac
T
3.0A
MR506
1N
4742
10k
3W
8
2.54V
1
Reference
10k
100k
7
+
2+ _-
1.27V
1.6M
+
47
+
3+ _-
+
10
1.27V
-
++
2.8V
-
++
0.6V
4
+
MAC
228A6FP
220
250V
B+
75k
10k
+ 220
250V
1.2k
75k
RTN
6
5
The above circuit shows the MC34161 configured as an automatic line voltage selector. The IC controls the triac, enabling the circuit to function
as a fullwave voltage doubler or a fullwave bridge. Channel 1 senses the negative half cycles of the AC line voltage. If the line voltage is less
than150 V, the circuit will switch from bridge mode to voltage doubling mode after a preset time delay. The delay is controlled by the 100 kW resistor
and the 10 mF capacitor. If the line voltage is greater than 150 V, the circuit will immediately return to fullwave bridge mode.
Figure 26. Automatic AC Line Voltage Selector
http://onsemi.com
13