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| ADuM7223 4A隔离的半桥栅极驱动方案 |
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| 文章来源： 更新时间：2014/8/27 10:51:00 |
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ADI公司的ADuM7223是 4A隔离的半桥栅极驱动器,采用ADI公司的iCoupler®技术,提供单独和隔离的高边与低边输出.和高速CMOS和单片变压器技术,绝缘器件提供杰出的性能,输入工作电压3.0V-5.5V,输出工作电压4.5V-18V,工作频率1MHz,传输延迟64ns,主要用在开关电源,隔离的IGBT/MOSFET栅极驱动器和工业逆变器.本文介绍了ADuM7223主要特性,框图, 评估板EVAL-ADuM7223EBZ主要特性,电路图,材料清单和PCB设计图.
The ADuM7223 is a 4.0 A isolated, half-bridge gate driver that employs Analog Devices, Inc., iCoupler® technology to provide independent and isolated high-side and low-side outputs. Combining high speed CMOS and monolithic transformer technology, these isolation components provide outstanding performance characteristics superior to alternatives such as the combination of pulse transformers and non-isolated gate drivers. By integrating the isolator and driver in a single package, propagation delay is a maximum of only 64 ns, and the propagation skew from channel to channel is a maximum of only 12 ns at 12 V. The ADuM7223 provides two independent isolation channels.
The ADuM7223 operates with an input supply ranging from 3.0 V to 5.5 V, providing compatibility with lower voltage systems. The outputs operate in a wide range from 4.5 V to 18 V with three output voltage versions available. The 5 mm × 5 mm, LGA package provides 565 V operating voltage from input to output and 700 V from output to output. In comparison to gate drivers employing high voltage level translation methodologies, this gate driver offers the benefit of true, galvanic isolation between the input and each output. As a result, this gate driver provides reliable control over the switching characteristics of IGBT/MOSFET configurations over a wide range of positive or negative switching voltages.
ADuM7223主要特性:
4.0 A peak output current
Working voltage
High-side or low-side relative to input: 565 V peak
High-side to low-side differential: 700 V peak
High frequency operation: 1 MHz maximum
Precise timing characteristics
64 ns maximum propagation delay
8.5 ns maximum channel-to-channel matching
3.0 V to 5.5 V input voltage
4.5 V to 18 V output drive
UVLO supply at 2.8 V VDD1
A Version UVLO, VDDA and VDDB (VDD2) at 4.1 V
B Version UVLO, VDDA and VDDB at 6.9 V
C Version UVLO, VDDA and VDDB at 10.5 V
CMOS input logic levels
High common-mode transient immunity: >25 kV/μs
High junction temperature operation: 125℃
Default low output
5 mm × 5 mm, 13-terminal LGA
ADuM7223应用:
Switching power supplies
Isolated IGBT/MOSFET gate drives
Industrial inverters
图1. ADuM7223框图
评估板EVAL-ADuM7223EBZ
The EVAL-ADuM7223EBZ supports the ADuM7223 4 A, isolated precision half bridge driver. Because the evaluation boards have footprints for insulated gate bipolar transistors (IGBTs) and metal oxide semiconductor field effect transistors (MOSFETs) in TO-252 packages, the ADuM7223 can be evaluated with many different power devices. The evaluation boards also allow the high-side supply to be bootstrapped to the low-side supply.
The ADuM7223A model represents a superset of the ADuM7223 models because it has the lowest minimum output voltage (4.5 V). The evaluation board comes populated with the lowest undervoltage lockout (UVLO) value (Grade A).
Complete information about the ADuM7223 is available in the ADuM7223 data sheet, which should be consulted in conjunction with this user guide when using the evaluation board.
评估板EVAL-ADuM7223EBZ主要特性:
4 A peak output current
High frequency operation: 1 MHz maximum
CMOS input logic levels
4.5 V to 18 V output drive
Supports TO-252 IGBT/MOSFETs
Bootstrap option
图2. 评估板EVAL-ADuM7223EBZ外形图
图3. 评估板EVAL-ADuM7223EBZ半桥驱动器电路图
图4. 评估板EVAL-ADuM7223EBZ PCB设计图:顶层
图5. 评估板EVAL-ADuM7223EBZ PCB设计图:底层
评估板EVAL-ADuM7223EBZ材料清单:
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