ST VIPERGAN50 E模式GaN HEMT 50W高压转换器参考设计

ST公司的VIPERGAN50是高压转换器,设计用于中功率准谐振ZVS (开关时零电压开关)反激转换器,能够在大范围内提供输出功率高达50W. VIPERGAN50集成了完整的特性,提供极灵活特性和容易使用芯片,有助于设计高效率离线电源.ZVS准谐振工作和动态消隐时间特性以及谷同步功能,它经常在漏极共振的谷底打开功率开关,从而降低了任何输入线和负载条件下的开关损耗和最大化总体效率.具有低静态的先进功率管理有助于获得低的待机功耗. 正反馈补偿最大限度降低了最大输出峰值功率在整个输入电压范围内的变化,器件具有准谐振(QR)反馈控制器,650V E模式功率GaN晶体管,嵌入了检测FET,谷底锁住保证不变的谷底跳跃,先进的功率管理具有于小于30mW待机功耗和自适应突发模式.器件具有输出OVP保护, Brown-in 和brown-out保护,输入OVP保护,嵌入热关断,频率抖动用来EMI抑制.主要用在高效率功率适配器,快速电池充电器,以及电器,工业,消费类电子和照明的辅助电源.本文介绍了VIPERGAN50主要特性,典型应用电路高压起动发生器的内部电路和引脚配置,以及基于VIPERGAN50和STUSB4761的45 W QR USB PD适配器参考设计EVLVIPGAN50PD主要特性与电指标,以及主板与子板电路图.

Advanced quasi-resonant offline high voltage converter with E-mode GaN HEMT

The VIPERGAN50 is a high voltage converter, designed for medium power quasiresonant

ZVS (Zero Voltage Switching at switch turn-on) flyback converters, capable to provide an output power up to 50 W in wide range.

It integrates a complete set of features that provide an extremely flexible and easy to use chip and helps to design a highly efficient offline power supply. The ZVS quasi-resonant operation with the dynamic blanking time feature and the valley synchronization function, that turns on the power switch always at the valley of the drain resonance, reduces the switching losses and maximizes the overall efficiency at any input line and load condition. The advanced power management with the low quiescent helps to achieve low stand-by consumptions. The feed-forward compensation minimizes the maximum output peak power variation over the entire input voltage range.

In addition to the above funct...