Avago Technologies has introduced the ACPL-H342 and ACPL-K342, which are 2.5A peak-output drive, optically isolated IGBT gate drivers. The drivers feature a built-in Miller clamp, Rail-to-Rail output voltage, UVLO (under-voltage lockout) circuitry and protection against IGBT cross-conduction and current "shoot-through" for power inverter and motor control applications. A Miller clamp allows the control of Miller current during high dV/dt output transition and eliminates the need for a negative power supply to ensure safe IGBT turn off by quickly discharging the device's large gate capacitance to a low level without affecting the IGBT turn-off characteristics. The devices feature a common-mode transient immunity of 40kV/µs at a 1.5kV common mode voltage for reliable operation in noisy environments. The UVLO function causes the output to be clamped whenever there is insufficient power supply voltage for safe operation. The under-voltage lockout protection circuitry ensures that there is sufficient gate drive voltage to switch the IGBTs completely on, thereby minimising IGBT power dissipation. Once the supply voltage exceeds the positive-going UVLO threshold, the UVLO clamp is released, allowing the device output to turn on in response to an input signal. The rail-to-rail output voltage swing and the low output dead time of the gate drivers, made possible by low propagation time, minimise driver dissipation and increase efficiency. Propagation delay is specified to prevent cross conduction of the IGBTs in the high- and low-side half-bridge IGBT configuration that is commonly used in power inverters. Propagation delay difference, or tphl - tplh, between two devices is -10ns minimum to -200ns maximum. Hence, shoot through is prevented, eliminating a condition that can cause IGBT damage and shorten operating life. The devices feature 15 to 30V supply voltage operation with rail-to-rail output drive. The maximum working insulation voltage per IEC/EN/DIN EN 60747-5-5 of the ACPL-H342-x60 is 891Vpeak and that of ACPL-K342-x60 is 1140Vpeak. The momentary withstand voltage per UL 1577 of ACPL-H342 is 3750Vrms for one minute and that of the ACPL-K342 is 5000Vrms for one minute. The gate drivers feature fast propagation delay that reduces dead time and increases system efficiency. The 8-lead stretched SSO-8 packages that are 40% smaller than conventional 8pin DIPs. All devices operate over a temperature range of -40 to +105°C.
Avago Technologies has introduced the ACPL-H342 and ACPL-K342, which are 2.5A peak-output drive, optically isolated IGBT gate drivers. The drivers feature a built-in Miller clamp, Rail-to-Rail output voltage, UVLO (under-voltage lockout) circuitry and protection against IGBT cross-conduction and current "shoot-through" for power inverter and motor control applications. A Miller clamp allows the control of Miller current during high dV/dt output transition and eliminates the need for a negative power supply to ensure safe IGBT turn off by quickly discharging the device's large gate capacitance to a low level without affecting the IGBT turn-off characteristics. The devices feature a common-mode transient immunity of 40kV/µs at a 1.5kV common mode voltage for reliable operation in noisy environments. The UVLO function causes the output to be clamped whenever there is insufficient power supply voltage for safe operation. The under-voltage lockout protection circuitry ensures that there is sufficient gate drive voltage to switch the IGBTs completely on, thereby minimising IGBT power dissipation. Once the supply voltage exceeds the positive-going UVLO threshold, the UVLO clamp is released, allowing the device output to turn on in response to an input signal. The rail-to-rail output voltage swing and the low output dead time of the gate drivers, made possible by low propagation time, minimise driver dissipation and increase efficiency. Propagation delay is specified to prevent cross conduction of the IGBTs in the high- and low-side half-bridge IGBT configuration that is commonly used in power inverters. Propagation delay difference, or tphl - tplh, between two devices is -10ns minimum to -200ns maximum. Hence, shoot through is prevented, eliminating a condition that can cause IGBT damage and shorten operating life. The devices feature 15 to 30V supply voltage operation with rail-to-rail output drive. The maximum working insulation voltage per IEC/EN/DIN EN 60747-5-5 of the ACPL-H342-x60 is 891Vpeak and that of ACPL-K342-x60 is 1140Vpeak. The momentary withstand voltage per UL 1577 of ACPL-H342 is 3750Vrms for one minute and that of the ACPL-K342 is 5000Vrms for one minute. The gate drivers feature fast propagation delay that reduces dead time and increases system efficiency. The 8-lead stretched SSO-8 packages that are 40% smaller than conventional 8pin DIPs. All devices operate over a temperature range of -40 to +105°C.
