Power_electronics Features

NewSpace demands low voltage, high current power for performance and longevity - Nov 2022
Matt Renola, Senior Director, Global Business Development – Aerospace & Defense
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Power Electronics Europe News
Isolated SiC gate driver is in SO-8 package to save space
Optimised for SiC MOSFETs, the single channel gate driver is supplied in a narrow body SO-8 package. It has been introduced in response to SiC technology being widely adopted to boost power conversion efficiency. According to the company, it simplifies design, saves space, and enhances robustness and reliability in energy-conscious power systems, drives, and controls.

It has galvanic isolation between the gate driving channel and the low voltage control and operates with up to 1700V on the high voltage rail. The input-to-output propagation time of less than 75ns ensures high PWM (pulse width modulation) accuracy, with switching due to common mode transient immunity (CMTI) of ±100V/ns. Built-in protection includes under-voltage lockout (UVLO), with a threshold tuned to prevent SiC power switches from operating in low efficiency or unsafe conditions. Thermal shutdown turns both driver outputs low if excessive junction temperature is detected.

There are two optional configurations, giving a choice of separate outputs that allow turn-on and turn-off times to be independently optimised using an external resistor or a single output with active Miller clamp function. The single output configuration enhances stability in high frequency, hard switching applications, leveraging the Miller clamp to prevent excessive oscillation of the power switch.

The STGAP2SiCSN logic inputs are compatible with TTL and CMOS logic down to 3.3V, simplifying connection to a host microcontroller or DSP. The driver can sink and source up to 4A at gate driving voltage up to 26V. An integrated bootstrap diode simplifies design and enhances reliability, and a shutdown mode with separate input pin helps minimize system power consumption.

The gate driver is available now, in the 5.0 x 4.0mm-wide SO-8N package. Applications include electric vehicle charging systems, switched mode power supplies, high voltage power factor correction (PFC), DC/DC converters, uninterruptible power supplies (UPS), solar power, motor drives, fans, factory automation, home appliances, and induction heating.

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