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Description
Avago’s 2.5 Amp Gate Drive Optocoupler with Integrated
Desaturation (VCE) Detection and Fault Status Feedback
makes IGBT VCE fault protection compact, afordable, and
easy-to-implement while satisfying worldwide safety and
regulatory requirements
Features
2.5 A maximum peak output current
Drive IGBTs up to IC = 150A, VCE = 1200V
Optically isolated, FAULT status feedback
SO-16 package
CMOS/TTL compatible
500 ns max. switching speeds
Features (continued)
“Soft” IGBT turn-of
Integrated fail-safe IGBT protection
– Desat (VCE) detection
– Under Voltage Lock-Out protection (UVLO)
with hysteresis
User conigurable: inverting, noninverting, auto-reset,
auto-shutdown
Wide operating VCC range: 15 to 30 Volts
-40°C to +100°C operating temperature range
15 kV/μs min. Common Mode Rejection (CMR) at
VCM =1500V
Regulatory approvals: UL, CSA, IEC/EN/DIN EN 60747-
5-2 (1230Vpeak Working Voltage)
若VIN+正常输入,脚14没有过流信号,且VCC2-VE=12v即输出正向驱动电压正常,驱动信号输出高电平,故障信号和欠压信号输出低电平。首先3路信号共同输入到JP3,D点低电平,B点也为低电平,50×DMOS处于关断状态。此时JP1的输入的4个状态从上至下依次为低、高、低、低,A点高电平,驱动三级达林顿管导通,IGBT也随之开通。
若IGBT出现过流信号(脚14检测到IGBT集电极上电压=7V),而输入驱动信号继续加在脚1,欠压信号为低电平,B点输出低电平,三级达林顿管被关断,1×DMOS导通,IGBT栅射集之间的电压慢慢放掉,实现慢降栅压。当VOUT=2V时,即VOUT输出低电平,C点变为低电平,B点为高电平,50×DMOS导通,IGBT栅射集迅速放电。故障线上信号通过光耦,再经过RS触发器,Q输出高电平,使输入光耦被封锁。同理可以分析只欠压的情况和即欠压又过流的情况。
HCPL-316J可分为输入IC(左边)和输出IC(右边)二部分,输入和输出之间完全能满足高压大功率IGBT驱动的要求。
HCPL-316J引脚功能描述
各引脚功能如下:
脚1(VIN+)正向信号输入;
脚2(VIN-)反向信号输入;
脚3(VCG1)接输入电源;
脚4(GND)输入端的地;
脚5(RESERT)芯片复位输入端;
脚6(FAULT) 故障输出,当发生故障(输出正向电压欠压或IGBT短路)时,通过光耦输出故障信号;
脚7(VLED1+)光耦测试引脚,悬挂;
脚8(VLED1-)接地;
脚9,脚10(VEE)给IGBT提供反向偏置电压;
脚11(VOUT)输出驱动信号以驱动IGBT;
脚12(VC)三级达林顿管集电极电源;
脚13(VCC2)驱动电压源;
脚14(DESAT) IGBT短路电流检测;
脚15(VLED2+)光耦测试引脚,悬挂;
脚16(VE)输出基准地。
A316J,HCPL-316J,HCPL-A316J
AVAGO