New Space-Saving Isolated SiC Gate Driver for Reliable Performance with Accurate PWM control

Published  October 18, 2021   0
STMicroelectronics’ STGAP2SiCSN Single-Channel Gate Driver

STMicroelectronics has released a single-channel gate driver, STGAP2SiCSN optimized to simplify design, save space, and enhance robustness and reliability in energy-conscious power systems, drives, and controls. Housed in space-saving narrow-body 5mm x 4mm-wide SO-8N package, the device is capable of controlling silicon-carbide MOSFETs and feature galvanic isolation between the gate-driving channel and the low-voltage control.

The STGAP2SiCSN operates with up to 1700V on the high-voltage rail and is suitable to be used in variety of applications such as 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.

The input-to-output propagation time of less than 75ns ensures high PWM accuracy, with reliable switching thanks 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, and thermal shutdown that turns both driver outputs low if excessive junction temperature is detected.

Two optional configurations are available, giving a choice of separate outputs that allow turn-on and turn-off times to be independently optimized 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 device’s price range starts from $1.25 for orders of 1000 pieces.