[原创]ADI ADUM4146单／双电源高压隔离SiC栅极驱动方案

ADI公司的ADUM4146是带米勒箝位的单/双电源高压隔离SiC栅极驱动器,采用ADI公司的iCoupler®技术,在输入信号和输出栅极驱动之间提供隔离.ADuM4146包括米勒箝位,它在栅极电压降到低于2V时能用单个电源提供SiC强健的关断特性.ADI公司芯片级的变压器在高压域和低压域之间的芯片提供隔离的通信控制信息.ADuM4146集成的去饱和检测电路能提供保护,以对抗高压短路SiC操作.去饱和检测包含降噪特性如300ns屏蔽高压尖脉冲时间(开关事件到屏蔽高压尖脉冲).内部的500 μA电流源使得元件数量低,而内部消隐开关允许需要更高的噪音免疫度时可增加外接电流源.峰值输出电流4A,输出电源的电阻小于1 Ω,低传输时延为75ns,最小脉冲宽度为50ns,输出电压高达35V,输入电压从2.5V到6V,工作温度−40C 到 +125C, 100 kV/μs CMTI.主要案用在SiC/MOSFET/IGBT栅极驱动器,PV逆变器,马达驱动和电源.本文介绍了ADUM4146主要特性,功能框图,典型应用电路图

以及评估板EVAL-ADuM4146WHB1Z主要特性,框图和PCB功能位置图.

The ADuM4146 is a single-channel gate driver specifically optimized for driving silicon carbide (SiC) metal-oxide semiconductor field effect transistors (MOSFETs). Analog Devices, Inc., iCoupler® technology provides isolation between the input signal and the output gate drive.

The ADuM4146 includes a Miller clamp to provide robust SiC turn off with a single-rail supply when the gate voltage drops below 2 V. Operation with unipolar or bipolar secondary supplies is possible with or without the Miller clamp operation.

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