AC380V drop 5v12v24v200ma, UHV non isolated chip IC scheme

AC380V drop 5V12V24V200MA, Ultra high voltage non isolated chip IC programme ,AH86991 It is a high-performance switching mode power switch , Integrated 700V power MOSFET High voltage starting circuit . It is suitable for low-power off-line applications with the smallest components in typical buck solutions . The integrated circuit has a built-in high breakdown voltage MOSFET, To withstand high surge input . With the traditional PWM Control is different ,AH86991 There is no fixed internal clock to trigger GATE Driver , The switching frequency changes according to the load . Integrated multimodal PWM control , The circuit design is simplified , It realizes good line and load regulation without audio noise . No load low standby power , The peak current limit varies according to the actual load .AH86991 Integrated undervoltage lockout (UVLO)、 Cycle by cycle current limiting (OCP)、 Output OVP、 On chip thermal shutdown 、 Overload protection (OLP) And automatic recovery mode protection .18-600V High voltage drop type with ultra wide range input DC-DC Converter power chip , Adaptable to 12-380VAC Ultra wide voltage input ( External rectification and filtering ), The output current can reach 500mA, Comprehensive and perfect protection functions are integrated inside （ Short circuit protection , Overload protection , Output overvoltage protection 、 Output under voltage protection , Overheating protection, etc ）. The step-down constant voltage chip has a low cost BOM cost （ The number of peripheral components is very small ） It is convenient to realize the solution of wide voltage, high voltage and step-down low-power power power supply ,   It is widely used in non isolated household appliances and industrial products .

  Characteristics of step-down constant voltage chip products ：

1. built-in 650V High voltage power switch , Can work on 380VAC In the power grid （ Need to add rectifier filter ）
2. Very low standby power consumption ： Typical standby power consumption is less than 40mW;

3. High conversion efficiency 90%;
4. Output current 500mA, Output a single voltage ：3.3V,5V, or 12V, or 24V etc. ;
5.18-600VDC Ultra wide input voltage , Adaptable to 12-380VAC Ultra wide voltage input ;
6. Comprehensive protection function ：
7. Over current protection （OCP）, Output overload 、 Overcurrent and short circuit protection function ;
8. Over temperature protection （OTP）, Overheating shutdown protection function with hysteresis ;
9. Over voltage protection （OVP）;
10. Designed for wide voltage input （18-600VDC） And high voltage step-down converter design , Adaptable to 12-380VAC Ultra wide voltage input ;
11.SOP8 Chip package ;

Typical application of step-down constant voltage chip （ Non segregated ）：

It is suitable for all kinds of smart small household appliances author ：y13620208063 https://www.bilibili.com/read/cv15775381/ Source ：bilibili