Changyun Optoelectronics Technology Co., Ltd., an integrated circuit design company dedicated to power supply and LED driver design, recently officially released the primary side feedback switching power supply circuit to support the driving of low-power triode devices.
In recent years, high-power high-brightness LEDs have developed rapidly. Luminous efficiency continues to increase, and prices continue to fall. LED lighting is the hope of future green lighting, however, the design of LED driver circuits faces many difficulties. Since LEDs require low-voltage DC power supply driving, AC-DC conversion is required to convert AC voltage into low-voltage DC power under AC grid input conditions, while controlling the LED current is constant, and electrical isolation of input and output is also a safety requirement. The development of high reliability, small size, low cost LED drive circuit has become one of the keys to the large-scale application of LED lighting.
CYT8706 is a high-performance control chip designed for LED driver, charger and adapter power. It uses pulse frequency adjustment to operate the power supply in the discontinuous mode of the flyback topology without the need for optocouplers and secondary sides. The control circuit can realize the functions of outputting constant current and constant voltage. At the same time, the entire power system can be stabilized without any loop compensation circuit. The chip can achieve higher output voltage adjustment accuracy and higher power supply efficiency. Under no-load, 264VAC input conditions, the input power consumption can be less than 0.2W.
The CYT8706 isolated AC/DC LED driver circuit has the following features: the drive flyback circuit operates in the discontinuous conduction mode; the secondary side optocoupler and constant voltage constant current control circuit are not required, and the primary side control technology is used to achieve constant voltage constant current. Output; stable control without loop compensation circuit; random frequency modulation technology can reduce system EMI; drive external triode low voltage turn-on, thus reducing switching loss; other features include internal soft start function, output open circuit and over voltage protection Functional and short circuit protection.
CYT8706 features: primary detection control mode, no need for optical and secondary feedback control circuit, directly drive low-cost power triode, reduce the overall cost of power supply (DEMO total cost is only 3.5 yuan); use constant current tightening technology to achieve vertical Constant current characteristics, constant current accuracy of ± 5%; less circuit components (only 21 BOM components), simple circuit structure;
Small size (25mm*16mm), the whole circuit can be installed in common specifications of lamp cups, such as E27, GU10, etc.; safe and reliable, with output open circuit protection, over voltage protection and short circuit protection; can pass EMI, CE and UL And other certifications;
It is controlled by a fixed primary peak current and is suitable for power supplies with an output power of 5W or less.
In recent years, high-power high-brightness LEDs have developed rapidly. Luminous efficiency continues to increase, and prices continue to fall. LED lighting is the hope of future green lighting, however, the design of LED driver circuits faces many difficulties. Since LEDs require low-voltage DC power supply driving, AC-DC conversion is required to convert AC voltage into low-voltage DC power under AC grid input conditions, while controlling the LED current is constant, and electrical isolation of input and output is also a safety requirement. The development of high reliability, small size, low cost LED drive circuit has become one of the keys to the large-scale application of LED lighting.
CYT8706 is a high-performance control chip designed for LED driver, charger and adapter power. It uses pulse frequency adjustment to operate the power supply in the discontinuous mode of the flyback topology without the need for optocouplers and secondary sides. The control circuit can realize the functions of outputting constant current and constant voltage. At the same time, the entire power system can be stabilized without any loop compensation circuit. The chip can achieve higher output voltage adjustment accuracy and higher power supply efficiency. Under no-load, 264VAC input conditions, the input power consumption can be less than 0.2W.
The CYT8706 isolated AC/DC LED driver circuit has the following features: the drive flyback circuit operates in the discontinuous conduction mode; the secondary side optocoupler and constant voltage constant current control circuit are not required, and the primary side control technology is used to achieve constant voltage constant current. Output; stable control without loop compensation circuit; random frequency modulation technology can reduce system EMI; drive external triode low voltage turn-on, thus reducing switching loss; other features include internal soft start function, output open circuit and over voltage protection Functional and short circuit protection.
CYT8706 features: primary detection control mode, no need for optical and secondary feedback control circuit, directly drive low-cost power triode, reduce the overall cost of power supply (DEMO total cost is only 3.5 yuan); use constant current tightening technology to achieve vertical Constant current characteristics, constant current accuracy of ± 5%; less circuit components (only 21 BOM components), simple circuit structure;
Small size (25mm*16mm), the whole circuit can be installed in common specifications of lamp cups, such as E27, GU10, etc.; safe and reliable, with output open circuit protection, over voltage protection and short circuit protection; can pass EMI, CE and UL And other certifications;
It is controlled by a fixed primary peak current and is suitable for power supplies with an output power of 5W or less.
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