基于UCC21225A隔离双路栅极驱动和参考设计

电子工程师 2019-08-04 4403

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描述

TI公司的ucc21225A是隔离双路栅极驱动器，具有源电流4A和沉峰值电流6A，封装为5-mm x 5-mm LGA-13.可以驱动高达5MHz的功率晶体管，具有业界最低的时延和脉宽失真。典型的传输时延为19ns，最大时延匹配为5ns，脉宽失真最大为6ns.两个次级边驱动器间内部功能隔离允许工作电压高达700V，可配置成两个低边，两个高边，或有可编死区时间（DT）的半桥驱动器，器件的VDD电源电压高达25V，宽输入VCCI范围从3V到18V，使得驱动非常适合于模拟和数字控制器间的接口，所有的电源引脚有欠压锁住（UVLO）保护。相关的安全规范包括3535-VPK Isolation per DIN V VDE V 0884-11:2017-01和2500-VRMS Isolation for 1 Minute per UL 1577.主要用在服务器，通信，IT和工业领域，DC/DC转换器和AC/DC转换器，马达驱动和DC/AC太阳能逆变器以及HEV和BEV电池充电器。本文介绍了UCC21225A主要特性，框图和功能框图，典型应用电路图以及10kW三级三相连接电网的太阳能逆变器参考设计TIDA-0160610-kW主要特性和指标，框图，电路图和材料清单。

The UCC21225A is an isolated dual-channel gatedriver with 4-A source and 6-A sink peak current in a5-mm x 5-mm LGA-13 package. It is designed todrive power transistors up to 5-MHz with best-in-classpropagation delay and pulse-width distortion.

The input side is isolated from the two output driversby a 2.5-kVRMS isolation barrier， with 100-V/nsminimum common-mode transient immunity （CMTI）。

Internal functional isolation between the twosecondary side drivers allows working voltage up to700-VDC.This driver can be configured as two low-side， twohigh-side， or a half-bridge driver with programmabledead time （DT）。 A disable pin shuts down bothoutputs simultaneously when it is set high， and allowsnormal operation when left open or grounded.

The device accepts VDD supply voltages up to 25-V.A wide input VCCI range from 3-V to 18-V makes thedriver suitable for interfacing with both analog anddigital controllers. All the supply voltage pins haveunder voltage lock-out （UVLO） protection.

With all these advanced features， the UCC21225Aenables high power density， high efficiency， androbustness in a wide variety of power applications.

UCC21225A主要特性：

1• Universal： Dual Low-Side， Dual High-Side or Half-Bridge Driver

• 5 x 5 mm， Space-Saving LGA-13 Package

• Switching Parameters：

– 19-ns Typical Propagation Delay

– 5-ns Maximum Delay Matching

– 6-ns Maximum Pulse-Width Distortion

• CMTI Greater than 100-V/ns

• 4-A Peak Source， 6-A Peak Sink Output

• TTL and CMOS Compatible Inputs

• 3-V to 18-V Input VCCI Range

• Up to 25-V VDD with 5-V UVLO

• Programmable Overlap and Dead Time

• Rejects Input Transients Shorter than 5-ns

• Fast Disable for Power Sequencing

• Safety-Related Certifications：

– 3535-VPK Isolation per DIN V VDE V 0884-11:2017-01

– 2500-VRMS Isolation for 1 Minute per UL 1577

– CQC per GB4943.1-2011 （Planned）

UCC21225A应用：

• Server， Telecom， IT and Industrial Infrastructures

• DC-DC and AC-to-DC Power Supplies

• Motor Drive and DC-to-AC Solar Inverters

• HEV and BEV Battery Chargers

晶体管

图1. UCC21225A框图

晶体管

图2. UCC21225A功能框图

晶体管

图3. UCC21225A典型应用电路图

10kW三级三相连接电网太阳能逆变器的参考设计TIDA-0160610-kW

This reference design provides an overview on how toimplement a three-level， three-phase， SiC-basedDC/AC grid-tie inverter stage. A higher switchingfrequency of 50 kHz reduces the size of magnetics forthe filter design and as a result a higher power density.SiC MOSFETs with switching loss ensures higher DCbus voltages of up to 1000 V and lower switchinglosses with a peak efficiency of 99%. This design isconfigurable to work as a two-level or three-levelinverter.

参考设计TIDA-0160610-kW主要特性：

• Rated Nominal and Max Input Voltage at 800-Vand 1000-V DC

• Max 10-kW/10-kVA Output Power at 400-V AC50- or 60-Hz Grid-Tie Connection

• Operating Power Factor Range From 0.7 Lag to0.7 Lead

• High-Voltage （1200-V） SiC MOSFET-Based Full-Bridge Inverter for Peak Efficiency of 98.5%

• Compact Output Filter by Switching Inverter at50 kHz

• 《2% Output Current THD at Full Load

•Isolated Driver ISO5852S With Reinforced Isolationfor Driving High-Voltage SiC MOSFET andUCC5320S for Driving Middle Si IGBT

• Isolated Current Sensing Using AMC1301 for LoadCurrent Monitoring

• TMS320F28379D Control Card for Digital Control

参考设计TIDA-0160610-kW应用：

• Solar String Inverters