原标题：ADI ADUM4221 4A隔离的半桥栅极驱动器解决方案

　　ADI公司的ADUM4221是4A输出隔离的半桥栅极驱动器,采用了该公司的iCoupler®技术,提供独立和隔离的高边和低边输出.它的隔离电压为5700V rms.器件组合了高速CMOS和单片变压器技术,这些隔离元件提供了比通常的脉冲变压器和栅极驱动器组合体更加优异的性能特性. ADuM4221的逻辑输入电压从2.5V到6.5V,和低压系统兼容.和采用高压绝缘方法的栅极驱动器相比, ADuM4221具有输入和输出间真正的电流隔离的优势.器件内置了重叠保护,允许死区时间可调整.死区时间引脚(DT)和GDN1引脚间的单个电阻设定了高边输出和低边输出间的次级边的死区时间. ADuM4221的峰值电流为4A(<2 Ω RDSON_x).最大传输时延为44ns,高共模瞬态免疫力为150 kV/μs, 默认低输出, 5700Vrms持续1分钟,UL认证per UL 1577.结温工作温度125C.主要应用在开关电源,隔离IGBT/MOSFET栅极驱动器,工业逆变器和氮化镓(GaN)/碳化硅(SiC)兼容器件.本文介绍了ADUM4221自举半桥应用电路,评估板EVAL-ADuM4221EBZ主要特性,电路图,材料清单和PCB设计图.

　　The ADuM4221 is a 4 A isolated, half bridge gate driver that employs the Analog Devices, Inc., iCoupler® technology to provide independent and isolated high-side and low-side outputs. The ADuM4221 provides 5700 V rms isolation in the increased creepage wide body, 16-lead SOIC_IC package. Combining high speed CMOS and monolithic transformer technology, these isolation components provide outstanding performance characteristics superior to the alternatives, such as the combination of pulse transformers and gate drivers.

　　The isolators operate with a logic input voltage ranging from 2.5 V to 6.5 V, providing compatibility with lower voltage systems. In comparison to gate drivers employing high voltage level translation methodologies, the ADuM4221 offers the benefit of true, galvanic isolation between the input and each output.

　　The ADuM4221 has a built in overlap protection and allows for dead time adjustment. A single resistor between 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.

　　An internal thermal shutdown (TSD) sets outputs low if the internal temperature on the ADuM4221 exceeds the TSD temperature. As a result, the ADuM4221 provides reliable control over the switching characteristics of the insulated gate bipolar transistor (IGBT)/metal-oxide semiconductor field effect transistor (MOSFET) configurations over a wide range of positive or negative switching voltages.

　　ADUM4221主要特性:

　　4 A peak current (<2 Ω RDSON_x)

　　2.5 V to 6.5 V logic input voltage

　　4.5 V to 35 V output supply voltage

　　UVLO VDD1 positive going threshold: 2.5 V maximum

　　Multiple UVLO options for VDDA and VDDB positive going threshold

　　Grade A: 4.5 V maximum

　　Grade B: 7.5 V maximum

　　Grade C: 11.6 V maximum

　　Precise timing characteristics

　　44 ns maximum propagation delay

　　Adjustable dead time

　　CMOS input logic levels

　　High common-mode transient immunity: 150 kV/μs

　　High junction temperature operation: 125C

　　Default low output

　　Safety and regulatory approvals (pending)

　　UL recognition per UL 1577

　　5700 V rms for 1 minute duration

　　CSA Component Acceptance Notice 5A (pending)

　　VDE certificate of conformity (pending)

　　DIN V VDE V 0884-11

　　VIORM = 849 V peak

　　Increased creepage wide body, 16-lead SOIC_IC

　　ADUM4221应用:

　　Switching power supplies

　　Isolated IGBT/MOSFET gate drives

　　Industrial inverters

　　Gallium nitride (GaN)/silicon carbide (SiC) compatible

　　图1. ADUM4221自举半桥应用电路

　　评估板EVAL-ADuM4221EBZ

　　The EVAL-ADuM4221EBZ supports the ADuM4221 half bridge gate driver that employs Analog Devices, Inc., iCoupler® technology to provide independent and isolated high-side and low-side outputs. The EVAL-ADuM4221EBZ is populated with the ADuM4221, which has VIA and VIB inputs and dead time control. The EVAL-ADuM4221EBZ supplies jumpers and screw terminals to configure different drive conditions. The EVAL-ADuM4221EBZ operates with square waves and dc values on the VIA, VIB, and DISABLE pins.

　　The ADuM4221 operates with an input supply ranging from 2.5 V to 6.5 V, providing compatibility with lower voltage systems. Logic level voltages at the input pins control the VOA and VOB outputs. The driver has a DISABLE input pin that, if held high, shuts the device off regardless of the input on the channels. In addition to basic overlap protection, the dead time (DT) pin on the primary side allows an adjustable dead time between the VOA and VOB output transitions.

　　The ADuM4221 provides operation with voltages of up to 35 V on the secondary side. The EVAL-ADuM4221EBZ has a provision for the high-side supply to be bootstrapped to the low-side supply. The EVAL-ADuM4221EBZ facilitates testing of the propagation delay, drive strength, dead time operation, and input logic of the device. Because the EVAL-ADuM4221EBZ has footprints for insulated gate bipolar transistors (IGBTs) and metal-oxide semiconductor field effect transistors (MOSFETs) in TO-220 and TO-252 packages, the ADuM4221 can be evaluated with many different power devices.

　　For complete information about the ADuM4221, refer to the ADuM4221 data sheet in conjunction with this user guide when using the EVAL-ADuM4221EBZ.

　　评估板EVAL-ADuM4221EBZ主要特性:

　　Adjustable dead time

　　Output voltage range to 35 V

　　Screw terminals for easy connectivity

　　Pad placement for external series gate resistors

　　Pad placement for capacitive load testing

　　Supports TO-220 or TO-252 IGBTs or MOSFETs

　　Bootstrap option

　　Jumper placement for easy half bridge setup

　　图2. 评估板EVAL-ADuM4221EBZ外形图

　　图3. 评估板EVAL-ADuM4221EBZ电路图