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| STCC05-B Datasheet, PDF (11/13 Pages) STMicroelectronics – HOME APPLIANCE CONTROL CIRCUIT | |||
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STCC05-B
Finally, the opto-coupler could be connected directly in high side mode between the SYN and the VDD
pins: the ZVS signal is then made of high level pulses synchronized with the zero crossing. However, the
coupler could be connected in low side mode with an external 10k pull-up resistor to VDD: the ZVS is now
inverted with low level pulses.
Figure 18: ZVS circuit operation with an opto-coupler
VAC
VAC
VSYN
IOPTO
VSYN
IOPTO
VZVS
VZVS
V DD
V DD
VAC
20µs FILTER
SYN
25 kâ¦
S1
ZVS
Q
V DD
RUP
10 kâ¦
SYN
25 kâ¦
V DD
20µs FILTER
S1
ZVS
Q
V SYN
100 kâ¦
S2
V ZVS
VAC
V SYN
100 kâ¦
S2
V ZVS
COM
COM
Figure 19: Ordering Information Scheme
Circuit configuration and
related application
05 = Air conditioner control
Typical power supply voltage
B = 12V
Package
D4 = DIP-20
STCC X - B Z
11/13
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