原标题：基于ST VIPER01的4.25W非隔离家电产品MCU电源方案

　　此方案采用ST Viper01新型节能IC，以非隔离Buck线路，提供5V/4.2W，做为家电产品内的MCU所需的Vcc使用，达到达到最少的组件数量设计完整的应用。AC电压输入非隔离转换DC电压，空载待机时的五星级能效等级，并符合欧洲CoC版本规定及RoHS标准。具有短路、过温度、开环路、保护功能。

　　场景应用图

　　展示板照片

　　方案方块图

　　核心技术优势

　　1.AC电压输入非隔离转换DC电压

　　2.空载待机时的五星级能效等级(PIN_no_load <10 mW @ 230 VAC)

　　3.符合欧洲CoC版本规定的10%负载效率和4点平均有效模式效率目标

　　4.符合RoHS标准

　　方案规格

　　1.高压启动功能

　　2.内建800V MOSFET

　　3.宽范围的Vcc(4.5V~30V)

　　4.有软启动功能

　　5.有30KHz、60KHz、120KHz固定频率可挑选及含有抖动功能。

　　6.具有短路、过温度、开环路、保护功能

　　技术文档

　　【VIPER01】

　　VIPerPlus family: Low voltage energy saving fixed frequency high voltage converter

　　The device is a high voltage converter smartly integrating an 800 V avalanche-rugged power MOSFET with PWM current mode control. The power MOSFET with 800 V breakdown voltage allows the extended input voltage range to be applied, as well as the size of the DRAIN snubber circuit to be reduced. This IC meets the most stringent energy-saving standards as it has very low consumption and operates in pulse frequency modulation under light load. The design of flyback, buck and buck boost converters is supported. The integrated HV startup, sense-FET, error amplifier and oscillator with jitter allow a complete application to be designed with the minimum number of components.

　　主要特性

　　800 V avalanche-rugged power MOSFET allowing ultra wide VAC input range to be covered

　　Embedded HV startup and sense-FET

　　Current mode PWM controller

　　Drain current limit protection (OCP)

　　Wide supply voltage range: 4.5 V to 30 V

　　Self-supply option allows the auxiliary winding or bias components to be removed

　　Minimized system input power consumption:

　　Less than 10 mW @ 230 VAC in no-load condition

　　Less than 400 mW @ 230 VAC with 250 mW load

　　Jittered switching frequency reduces the EMI filter cost:

　　30 kHz ± 7% (type X)

　　60 kHz ± 7% (type L)

　　120 kHz ± 7% (type H)

　　Embedded E/A with 1.2 V reference

　　Protections with automatic restart: overload/short-circuit (OLP), line or output OVP, max. duty cycle counter, VCC clamp

　　Pulse-skip protection to prevent flux-runaway

　　Embedded thermal shutdown

　　Built-in soft-start for improved system reliability