ADI ADuM4146米勒箝位的单/双电源高电压隔离SiC栅极驱动方案

ADI公司的ADuM4146是款单通道栅极驱动器,专门针对驱动碳化硅(SiC)金属氧化物半导体场效应晶体管(MOSFET)进行了优化.ADI公司的iCoupler®技术在输入信号与输出栅极驱动器之间实现隔离.ADuM4146包含米勒箝位,以便栅极电压低于2 V时实现稳健的SiC单轨电源关断.输出侧可以由单电源或双电源供电,是否使能米勒箝位功能也可以进行配置.

ADI公司芯片级变压器还提供芯片高压侧与低压侧之间的控制信息隔离通信.芯片状态信息可从专用输出读取.当器件副边出现故障时,可以在原边对复位操作进行控制.去饱和检测电路集成在ADuM4146上,提供高压短路SiC工作保护.考虑到通用SiC电平,副边欠压闭锁(UVLO)设置为11.5 V. 4 A峰值驱动输出能力,输出功率器件电阻为<1 Ω. 工作温度范围：−40°C至+125°C,输出电压范围最高可达35 V,输入电压范围为2.5 V至6 V,输出和输入UVLO,爬电距离为8 mm(最小值).主要用在SiC/MOSFET/IGBT 栅极驱动器,PV逆变器,电机驱动器和电源.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,电路图和PCB设计图.

11 A High Voltage Isolated Bipolar Gate Driver with Fault Detection, Miller Clamp

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 to less than 2 V. Operation with unipolar or bipolar secondary supplies is possible with or without the Miller clamp operation.

The Analog Devices chip scale transformers also provide isolated communication of control information between the high voltage and low voltage domains of the chip. Information on the status of the chip can be read back from dedicated outputs. Control of resetting the device after a fault on the secondary side is performed on the primary side of the device.

Integrated onto the ADuM4146 is a desaturation detection c...