System designers today demand gate drivers with integrated features such as active Miller blocking and rail-to-rail output for reliable operation and protection of power IGBTs and MOSFETs. This is especially important in motor and inverter control for renewable energy applications, where downtime is unacceptable and repairs are costly.
Miller blocking enables Miller current control during output transitions with high dV/dt. It can also eliminate the need for a negative supply to ensure safe IGBT shutdown by rapidly discharging the IGBT's large gate capacitance to a low level without affecting the IGBT's switching characteristics.
Furthermore, Avago's new gate control optocouplers offer best-in-class common-mode transient immunity of 40 kV/µs for a common-mode voltage of 1.5 kV, ensuring reliable operation in noisy environments.
The UVLO function causes the output to be locked out whenever there is insufficient supply voltage for safe operation. Undervoltage lockout protection circuitry ensures that sufficient gate control voltage is available to fully switch the IGBTs into conduction, thus minimizing power dissipation in the IGBT. Once the supply voltage exceeds the positive UVLO threshold, UVLO lock is released, allowing the device to turn on in response to an input signal.
Efficiency was a key design objective in the new ACPL-H342 and ACPL-K342 gate drivers. Their rail-to-rail output voltage variation and reduced output dead time, made possible by the short propagation delay, minimize driver dissipation and increase efficiency.
The propagation delay is specified to prevent cross-conduction of the IGBTs in the half-bridge configuration on the high- and low-potential sides commonly used in power inverters. The propagation delay difference between the two devices ranges from a minimum of -10 ns to a maximum of -200 ns. This prevents triggering, eliminating a critical state that damages the IGBT and shortens its lifespan.
They are supplied in RoHS-compliant, elongated 8-pin SO-8 packages, which are 40% smaller than conventional 8-pin DIP packages. The operating temperature range is -40 to +105 °C.
Miller blocking enables Miller current control during output transitions with high dV/dt. It can also eliminate the need for a negative supply to ensure safe IGBT shutdown by rapidly discharging the IGBT's large gate capacitance to a low level without affecting the IGBT's switching characteristics.
Furthermore, Avago's new gate control optocouplers offer best-in-class common-mode transient immunity of 40 kV/µs for a common-mode voltage of 1.5 kV, ensuring reliable operation in noisy environments.
The UVLO function causes the output to be locked out whenever there is insufficient supply voltage for safe operation. Undervoltage lockout protection circuitry ensures that sufficient gate control voltage is available to fully switch the IGBTs into conduction, thus minimizing power dissipation in the IGBT. Once the supply voltage exceeds the positive UVLO threshold, UVLO lock is released, allowing the device to turn on in response to an input signal.
Efficiency was a key design objective in the new ACPL-H342 and ACPL-K342 gate drivers. Their rail-to-rail output voltage variation and reduced output dead time, made possible by the short propagation delay, minimize driver dissipation and increase efficiency.
The propagation delay is specified to prevent cross-conduction of the IGBTs in the half-bridge configuration on the high- and low-potential sides commonly used in power inverters. The propagation delay difference between the two devices ranges from a minimum of -10 ns to a maximum of -200 ns. This prevents triggering, eliminating a critical state that damages the IGBT and shortens its lifespan.
They are supplied in RoHS-compliant, elongated 8-pin SO-8 packages, which are 40% smaller than conventional 8-pin DIP packages. The operating temperature range is -40 to +105 °C.
