FOD8318: 2.5 A Output Current, IGBT Drive Optocoupler With Active Miller Clamp, Desaturation Detection and Isolated Fault Sensing

The FOD8318 is an advanced 2.5 A output current IGBT drive optocoupler, capable of driving most 1200 V / 150 A IGBTs. It is ideally suited for fast-switching driving of power IGBTs and MOSFETs used in motor control inverter applications and high-performance power systems. It consists of an integrated gate drive optocoupler featuring low RDS(ON) CMOS transistors to drive the IGBT from rail to rail and an integrated high-speed isolated feedback for fault sensing. The FOD8318 has an active Miller clamp fuction to shut off the IGBT during a high dv/dt situation without the need of a negative supply voltage. It offers critical protection features necessary for preventing fault conditions that lead to destructive thermal runaway of IGBTs.

It utilizes Fairchild’s proprietary coplanar Optoplanar® packaging technology , and optimized IC design to achieve high noise immunity, characterized by high common mode rejection and power supply rejection specifications.

The device is housed in a compact 16-pin small outline plastic package that meets the 8 mm creepage and clearance requirements.

Features

• High Noise Immunity characterized by common mode rejection
  • 35 kV / μs Minimum Common Mode Rejection (VCM = 1500 VPK)
• 35 kV / μs Minimum Common Mode Rejection (V_CM = 1500 V_PK)
• 2.5 A peak output current driving capability for most 1200 V/150A IGBT
• Optically isolated fault sensing feedback
• Active Miller clamp to shut off the IGBT during high dv/ dt without needing a negative supply voltage
• “Soft” IGBT turn-off
• Built-in IGBT protection
  • Desaturation detection
  • Under voltage lock-out protection
• Desaturation detection
• Under voltage lock-out protection
• Wide supply voltage range from 15V to 30V
  • Use of P-Channel MOSFETs at output stage enables output voltage swing close to the supply rail (rail-to-rail output)
• Use of P-Channel MOSFETs at output stage enables output voltage swing close to the supply rail (rail-to-rail output)
• 3.3V/5V, CMOS/TTL-compatible inputs
• High Speed
  • 500ns max. propagation delay over full operating temperature range
• 500ns max. propagation delay over full operating temperature range
• Extended industrial temperate range, -40°C to 100°Ctemperature range
• Safety and regulatory approvals
  • – UL1577, 4,243 VRMS for 1 min.
  • DIN EN/IEC 60747-5-5,1,414 V (peak) workinginsulation voltage, 8000 V (peak) transient isolationvoltage ratings
• – UL1577, 4,243 V_RMS for 1 min.
• DIN EN/IEC 60747-5-5,1,414 V (peak) workinginsulation voltage, 8000 V (peak) transient isolationvoltage ratings
• R_DS(ON) of 1 Ω (typ.) offers lower power dissipation
• User configurable: inverting, non-inverting, auto-reset,auto-shutdown
• 8mm creepage and clearance distances

Application Notes