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STCC02-E датащи(PDF) 11 Page - STMicroelectronics |
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STCC02-E датащи(HTML) 11 Page - STMicroelectronics |
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11 / 13 page ![]() STCC02-ED5 11/13 ■ ZVS CIRCUIT COMPATIBILITY WITH THE POWER SUPPLY RECTIFIER BRIDGE In some cases, the operation of the ZVS circuit may require a small capacitor CZV on the pin SYN in addition to the resistor RZV. 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 a10k Ω - 22nF RC circuit, the ZVS circuit becomes immune to such spikes. D1 1N4002 VCC TR1 12V 1.5VA D2~D5 1N4002 DOOR SWITCH C1 220uF C6 22nF MAINS1 R1 10k Vin VCC VDD VIN CUP VIN VCC RZV CZV DLC ZVS SYN IN2 IN2 COM 5V Regulator Reset with delay Zero volts sync. Door closed detection Magnetron driver Fan driver Buzzer driver 4ms/div VTF VZVS 2V/div 5V/div 4ms/div |
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