STCC02-ED5 Datasheet, PDF (11/13 Pages) STMicroelectronics – CONTROL CIRCUIT FOR HOME APPLIANCE MCU BASED APPLICATION

MAINS1 TR1 12V 1.5VA
VCC D1 Vin
1N4002
D2~D5
1N4002
R1
10k
C6
C1
220uF
VCC
22nF
DOOR SWITCH
STCC02-ED5
■ ZVS CIRCUIT COMPATIBILITY WITH THE POWER SUPPLY RECTIFIER BRIDGE
In some cases, the operation of the ZVS circuit may require a small capacitor C_ZV on the pin SYN in
addition to the resistor R_ZV. The diodes of the full wave rectifier bridge may have a low speed and may
switch off with recovery charges that create spikes on the pin SYN as shown on the waveforms below.
With a10kΩ - 22nF RC circuit, the ZVS circuit becomes immune to such spikes.
VCC
VIN
CUP
VIN
DLC
SYN
RZV
CZV
COM
5V Regulator
Reset with delay
Zero volts sync.
Door closed detection
Magnetron driver
IN2
Fan driver
IN2
VDD
ZVS
Buzzer driver
VZVS
4ms/div
VTF
2V/div
5V/div
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