Supply purpose: power drive offline voltage regulator
Performance characteristics of single-chip switching power supply:
Single-chip switching power supply can meet the requirements of household air conditioning controller switching power supply within AC volts wide voltage input range and output power. Designed, this switching power supply can not only replace the existing bulky linear power transformer, but also add multiple protection functions to the controller power supply to improve the reliability of the air conditioner.
It also has the following main performance characteristics:
It can form an isolated, energy-saving switching power supply with a minimum number of peripheral components. Compared with traditional low-frequency linear power supply solutions, it can not only achieve better voltage regulation and load regulation than low-frequency linear power supplies, but also improve the conversion efficiency of the entire power supply.
Adopting dynamic self-power supply technology, when the power supply power is less than 1, the auxiliary power winding can be omitted, simplifying the design of the high-frequency switching transformer of the power supply. The use of frequency dithering technology can reduce electromagnetic interference to a minimum, and can also reduce filter components and power consumption.
The built-in volt high-voltage power switch tube is suitable for switching power supplies operating in a wide voltage input range from AC to volts. According to needs, the power supply can be designed to work in two modes: continuous () and discontinuous ().
Ultra-low power consumption. If an external bias circuit is used for power supply, the switching power supply can operate without noise in the frequency jump mode of low peak current when no-load, and the power consumption of the whole machine is less than milliwatts.
The current mode controls the peak current of the power switch tube in each switching cycle, so that the switching power supply has a good dynamic load response speed. It also has a millisecond soft-start circuit inside, which ensures that there is no internal current in the switching power supply when it is turned on. , Voltage overshoot phenomenon. There are three fixed operating frequencies to choose from, and different switching transformer volumes can be flexibly selected according to the power supply volume. The protection function is complete. The feedback optocoupler can be directly connected to the feedback pin without complex peripheral circuits. The chip has a protection circuit that automatically restarts after a short circuit, an open-loop fault detection and over-voltage locking protection circuit, a current-limiting protection circuit and an overheating protection circuit with hysteresis characteristics.
Physical picture:
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NCP1014AP100G