ADI ADuM4221 4A隔离半桥栅极驱动器方案

ADI公司的ADuM4221/ADuM4221-1/ADuM4221-2是4A隔离的半桥栅极驱动器,采用ADI公司的iCouplerR技术,提供单独的和隔离的高边和低边输出.该器件组合了高速CMOS和单片变压器技术,和其它器件如脉冲变压器和栅极驱动器组合相比,具有杰出的性能,逻辑输入电压从2.5V到6.5V,和低电压系统兼容.器件具有高共模瞬态免疫150 kV/μs,工作结温125C, UL recognition per UL 1577 5700 V rms延续一分钟.主要用在开关电源,隔离的IGBT/MOSFET栅极驱动器,工业逆变器,氮化镓(GaN)/碳化硅(SiC)兼容.本文介绍了ADuM4221/ADuM4221-1/ADuM4221-2主要特性,功能框图,自举半桥工作电路以及评估板EVAL-ADuM4221-2EBZ主要特性,电路图,材料清单和PCB设计图.

The ADuM4221/ADuM4221-1/ADuM4221-2 are 4 A isolated, half bridge gate drivers that employ the Analog Devices, Inc.iCouplerR technology to provide independent and isolatedhigh-side and low-side outputs. The ADuM4221/ADuM4221-1/ ADuM4221-2 provide 5700 V rms isolation in an increased creepage wide body, 16-lead SOIC_IC. Combining high speedCMOS and monolithic transformer technology, these isolation

components provide outstanding performance characteristicssuperior to the alternatives, such as the combination of pulsetransformers and gate drivers. The isolators operate with a logic input voltage ranging from2.5 V to 6.5 V, providing compatibility with lower voltage

systems. In comparison to gate drivers employing high voltagelevel translation methodologies, the ADuM4221/ADuM4221-1/ADuM4221-2 offer the benefit of true, galvanic isolationbetween the input and each output.

The ADuM4221/ADuM4221-1 each have built in overlapprotection and allow dead time adjustment. A single resistorbetween the dead time pin (DT) and the GND1 pin sets the

dead time on the secondary side between the high-side and the low-side outputs. The ADuM4221-2 does not have overlapprotection nor dead time control.

An internal thermal shutdown (TSD) sets outputs low ifthe internal temperature on the ADuM4221/ADuM4221-1/ADuM4221-2 exceeds the TSD temperature. As a result,t...