This document describes a home appliance control circuit suitable for home appliance digital control, AC power drive and functional safety management applications. The circuit features wide range input supply voltage operation, 5V voltage regulator with ±5% full tolerance and 50mA output current, MCU reset circuit, 30µs digitally filtered inverting zero voltage synchronization, and three 50mA relay coil drivers.
The STCC05-B is a control circuit designed for home appliance digital control, specifically targeting air conditioners, refrigerators, and ovens. It integrates the microcontroller interface with AC power and cooling process sections, embedding most of the analog and power circuitry required for these modules.
Key features include a wide range input supply voltage operation (7 to 18V), a 5V regulator with over-current and thermal shutdown protection, and a digitally filtered Zero Voltage Synchronization (ZVS) circuit. The device drives compressors, fans, heaters, and valves via robust relay coil drivers and includes a buzzer driver with enable control and a level shifter for speed sensors or door switches.
| Input supply voltage range | 7 to 18 V |
|---|---|
| Output voltage accuracy | 5 V +/- 5% |
| Operating ambient temperature | -20 to 85°C |
| Maximum dissipation (DIP-20) | 0.90 W |
| ESD protection (HBM) | ± 2 kV |
| Relay driver current (RL1-3) | 50 mA DC |
| Relay driver current (RL4) | 150 mA DC |
It is used for home appliance digital control, specifically in air conditioners, refrigerators, and ovens for compressor, fan, heater, and valve drive circuits.
Yes, it includes a 30µs digitally filtered inverting Zero Voltage Synchronization circuit to synchronize operation with the AC line cycle.
The disabling reset delay time (TUP) is 400µs and the enabling reset delay time (TDW) is 200µs when CUP = 100nF.