Galvanic Isolated Gate Driver to Control and Protect Silicon Power Transistors


Has unwanted transistor turn-on and turn-off been a problem for you? This gate driver could give you a solution.

With 26V maximum gate-drive output voltage and optional separate turn-on/turn-off outputs or integrated active Miller clamp, STMicroelectronics has introduced STGAP2S single-channel galvanic isolated gate driver can control silicon-carbide (SiC) or silicon MOSFETs and IGBTs across a range of switching topologies.

Dedicated active Miller clamp pin

The STGAP2SCM has a dedicated active Miller clamp pin that provides a convenient solution to prevent unwanted transistor turn-on in half-bridge configurations. Connecting the MOSFET gate to this pin clamps the voltage to isolated ground at turn off, until the next genuine turn-on signal.


The STGAP2SM with separate turn-on and turn-off outputs helps optimize switching transitions using two external gate resistors.

All STGAP2S gate drivers have 4A rail-to-rail outputs for crisp, efficient switching, even with high-power inverters. Input-to-output propagation delay is within 80ns for precise PWM control at the high switching frequencies suited to SiC devices. High dV/dt common-mode transient immunity prevents energy-sapping spurious switching.

With 1700V galvanic isolation also built-in, these devices can simplify the bill of materials for consumer or industrial motor drives, 600V or 1200V inverters, DC/DC converters, battery chargers, welders, induction heaters, uninterruptible power supplies (UPS), and power-factor correction (PFC) controllers.

Integrated protection features

Extensive integrated protection features include Under-Voltage Lockout (UVLO) to protect the power switch if the supply voltage falls too low. In addition, over-temperature protection is provided, as well as hardware interlocking to prevent high-side/low-side cross conduction in half-bridge circuits. There is also a standby mode, which keeps the output in a safe state while saving power.

Designers can also take advantage of the EVALSTGAP2SCM evaluation board, which provides a fast and easy way to kick-start design.

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The STGAP2SCM, available now, and STGAP2SM, available in Q4 2018, are housed in the compact, industry-standard SO-8 power package, priced from $1.49 for orders of 1000 pieces.



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