ST VIPER11节能800V高压离线转换器解决方案

ST公司的VIPER11是节能高压离线转换器，集成了雪崩电压800V的MOSFET和PWM电流模式控制，允许可以使用超宽的VAC输入电压，嵌入了HV起动和检测FET，漏极电流限制保护，电源电压4.5V-30V，能满足最严格的节能标准，支持反激，降压和降压升压转换器，其集成的HV起动，检测FET，误差放大器和抖动振荡器可以使用最少外接元件实现完整的应用方案。主要用在家用电器，家庭自动化，工业，消费类电子和照明的低功率SMPS以及低功率适配器。本文介绍了VIPER11主要特性，框图，基本应用电路和多种应用电路，以及评估板STEVAL-ISA195V1主要特性和电指标，电路图，材料清单和PCB设计图。

The device is a high voltage converter smartlyintegrating an 800 V avalanche-rugged powerMOSFET with PWM current mode control. Thepower MOSFET with 800 V breakdown voltageallows the extended input voltage range to beapplied，as well as the size of the DRAIN snubbercircuit to be reduced. This IC meets the moststringent energy-saving standards as it has verylow consumption and operates in pulse frequency modulation under light load. The design offlyback， buck and buck boost converters is supported. The integrated HV startup， sense-FET， error amplifier and oscillator with jitter allowa complete application to be designed with theminimum number of components.

VIPER11主要特性：

• 800 V avalanche-rugged power MOSFETallowing ultra wide VAC input range to be covered

• Embedded HV startup and sense-FET

• Current mode PWM controller

• Drain current limit protection

– 480 mA （VIPER114）

– 590 mA （VIPER115）

• Wide supply voltage range： 4.5 V to 30 V

• Minimized system input power consumption：

– Less than 10 mW at 230 VAC in no-loadcondition

– Less than 400 mW at 230 VAC with 250mW load

• Jittered switching frequency reduces the EMIfilter cost：

– 30 kHz ± 7% （type X）

– 60 kHz ± 7% （type L）

• 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

VIPER11应用：

• Low power SMPS for home appliances， homeautomation， industrial， consumer， lighting

• Low power adapters

图1.VIPER11框图

图2.VIPER11基本应用电路图

图3.VIPER11反激转换器（非隔离）框图

图4.VIPER11带线路OVP的反激转换器（非隔离）框图

图5.VIPER11反激转换器（隔离）框图

图6.VIPER11初级边稳压器的隔离反激转换器框图

图7.VIPER11降压转换器正输出框图

图8.VIPER11降压-升压转换器负输出框图

评估板STEVAL-ISA195V1

STEVAL-ISA195V1： 5 V/1.8 W 30 kHz buck demo with the VIPer11 The STEVAL-ISA195V1 is a 5 V - 0.36 A power supply set in buck topology using the new VIPER11 off-line high voltageconverter by STMicroelectronics， specifically developed for non-isolated SMPS.

评估板STEVAL-ISA195V1主要特性：

• An 800 V avalanche rugged power section

• Integrated HV-start-up current generator

• Onboard soft-start

• PWM operation at 30 kHz with frequency jittering for lower EMI

• Transconductance error amplifier with 1.2 V ±2% reference voltage

• Self-supply option to avoid auxiliary winding and bias components

Thanks to the advanced light load management and ultra-low consumption of the VIPER11 internal blocks， the demo boardinput power consumption in no-load conditions can be reduced to less than 20 mW @230 VAC， and the most stringent energysaving regulations in terms of active mode and light load efficiency can be fulfilled. IC protection includes：

• Pulse skip mode to avoid flux-runaway during start-up

• Delayed overload shutdown for safe fault condition management

• Max. duty cycle counter

• Thermal shutdown

• Input overvoltage

All protections （except pulse skip mode） involve auto-restart mode.

图9.评估板STEVAL-ISA195V1外形图

评估板STEVAL-ISA195V1电指标：

图10.评估板STEVAL-ISA195V1电路图

评估板STEVAL-ISA195V1材料清单：

图11.评估板STEVAL-ISA195V1 PCB完整图

图12.评估板STEVAL-ISA195V1 PCB设计图：左：顶层布局;右：底层布局