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[原创] ADI ADuM4122隔离式栅极驱动器解决方案

关键词:电源管理 开关电源 栅极驱动器 ADuM4122

时间:2020-01-10 11:15:58       来源:中电网

ADI公司的ADuM4122是单栅极可调电压摆率的隔离式栅极驱动器,每个输出引脚2 A输出电流,3 A 峰值短路电流,CMOS 输入逻辑电平,高共模瞬变抗扰度大于150 kV/µs,高工作结温为125℃,符合 UL 1577认证.宽体8引脚SOIC封装的ADuM4122提供5 kV rms绝缘,绝缘元件组合了CMOS和单片变压器技术,提供了比其它器件脉冲变压器和栅极驱动器组合更优越的性能.ADuM4122输入电源电压为3.3V到6.5V,和低电压系统兼容.因此,在输入和输出区提供真正的电流隔离.主要用在开关电源,隔离IGBT和MOSFET栅极驱动器,以及其工业逆变器.本文介绍了ADuM4122主要特性,功能框图以及评估板EVAL-ADuM4122EBZ主要特性,电路图,材料清单和PCB设计图.

The ADuM4122 is an isolated, single device, dual output driver that uses iCoupler® technology to provide precision isolation. The ADuM4122 provides 5 kV rms isolation in the wide-body, 8-lead SOIC package. These isolation components combine high speed complementary metal-oxide semiconductor (CMOS) and monolithic transformer technology to provide performance characteristics superior to alternatives (such as a combination of pulse transformers and gate drivers).

The ADuM4122 operates with an input supply voltage range from 3.3 V to 6.5 V, providing compatibility with lower voltage systems. Unlike gate drivers that employ high voltage level translation methodologies, the ADuM4122 offers true galvanic isolation between the input and the output regions.

The ADuM4122 includes two output pins that facilitate slew rate control of two output drive strengths. The VOUT pin follows the logic of the VIN+ pin, while the boosting output, VOUT_SRC, can be toggled to follow the VIN+ pin or to go high-Z. The toggling of the slew rate is controlled by the primary side. Slew rate control can allow for electromagnetic interference (EMI) mitigation and voltage overshoot control.An internal thermal shutdown sets outputs low if internal temperatures on the ADuM4122 exceed the thermal shutdown temperature.

As a result, the ADuM4122 provides reliable control over the switching characteristics of insulated gate bipolar transistor (IGBT) and metal-oxide semiconductor field effect transistor (MOSFET) configurations over a wide range of switching voltages, allowing for simple slew rate control.

ADuM4122主要特性:

2 A output current per output pin (<3 Ω RDSON_X)
3 A peak short-circuit current
3.3 V to 6.5 V, VDD1
4.5 V to 35 V, VDD2
Positive going threshold, UVLO at 3.3 V VDD1
Multiple positive going thresholds, UVLO options on VDD2
Grade A: 4.4 V (typical) positive going threshold, UVLO
Grade B: 7.3 V (typical) positive going threshold, UVLO
Grade C: 11.3 V (typical) positive going threshold, UVLO
Precise timing characteristics
48 ns maximum propagation delay for falling edge
CMOS input logic levels
High common-mode transient immunity: >150 kV/μs
High junction temperature operation: 125℃
Default low output
Selectable slew rate control
Safety and regulatory approvals (pending)
UL recognition per UL 1577
5 kV rms for 1 minute
CSA Component Acceptance Notice 5A
VDE certificate of conformity (pending)
DIN V VDE V 0884-10
VIORM = 849 V peak
Wide-body, 8-lead SOIC_IC

ADuM4122应用:

Switching power supplies
Isolated IGBT and MOSFET gate drivers
Industrial inverters

图1.ADuM4122功能框图

评估板EVAL-ADuM4122EBZ

Evaluating the ADuM4122 Single Gate Adjustable Slew Rate Isolated Gate Driver, 3 A Short Circuit (<3 Ω)

The EVAL-ADuM4122EBZ evaluation board supports the ADuM4122 isolated gate driver with slew rate control. iCoupler® technology provides isolation between the ADuM4122 input signal and the output gate driver. The evaluation board supplies jumpers and screw terminals to configure different drive conditions. The EVAL-ADuM4122EBZ board operates with square waves and dc values on the VIN+ and SRC pins.

The ADuM4122 is operational with voltages of up to 35 V. Logic level voltages at the VIN+ pin control the VOUT output. The SRC pin controls whether the VOUT_SRC pin is either set to high-Z or follows the logic of the user supplied pulse-width modulation (PWM) input at VIN+. When the external series gate resistors combine the outputs from the VOUT and VOUT_SRC pins, one isolated gate driver is then able to have two easily selectable slew rates.

The EVAL-ADuM4122EBZ board tests the propagation delay, drive strength, slew rate selection, and input logic of the device.

Refer to the ADuM4122 data sheet for complete information about the ADuM4122, and consult the data sheet in conjunction with this user guide when using the evaluation board.

评估板EVAL-ADuM4122EBZ主要特性:

3 A short-circuit output capability
Output power device resistance: <3 Ω
Output voltage range to 35 V
Output and input undervoltage lockout (UVLO)
Pad placement for multiple switch types
Pad placement for external series gate resistors
Screw terminals for easy connectivity
Placement for capacitive load testing
Jumpers for easy slew rate setting
EVALUATION KIT CONTENTS
EVAL-ADuM4122EBZ evaluation board

图2.评估板EVAL-ADuM4122EBZ外形图

图3.评估板EVAL-ADuM4122EBZ电路图
评估板EVAL-ADuM4122EBZ材料清单:


图4.评估板EVAL-ADuM4122EBZ PCB设计图(1)

图5.评估板EVAL-ADuM4122EBZ PCB设计图(2)
详情请见:
https://www.analog.com/media/en/technical-documentation/data-sheets/ADuM4122.pdf
https://www.analog.com/media/en/technical-documentation/user-guides/EVAL-ADuM4122EBZ-UG-1440.pdf
ADuM4122.pdf
EVAL-ADuM4122EBZ-UG-1440.pdf

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