STMicroelectronics’ STGAP2SiCSN single-channel gate driver, optimized for silicon carbide (SiC) mosfets, is housed in a space-saving narrow-body SO-8 package. With high PWM control accuracy, the isolated SiC gate driver targets 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.
Click for a larger image. (Source: STMicroelectronics)
The STGAP2SiCSN operates with up to 1700 V on the high-voltage rail and features galvanic isolation between the gate-driving channel and the low-voltage control The device also features an input-to-output propagation time of less than 75 ns, which ensures high PWM accuracy, with reliable switching thanks to common-mode transient immunity (CMTI) of ±100 V/ns, said STMicroelectronics.
Built-in protection features include 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. They give designers 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 improves stability in high-frequency hard-switching applications, leveraging the Miller clamp to prevent excessive oscillation of the power switch, said the company.
The STGAP2SiCSN logic inputs are compatible with TTL and CMOS logic down to 3.3 V, which simplifies the connection to a host microcontroller or DSP. The driver can sink and source up to 4 A at a gate-driving voltage up to 26 V. Other features include an integrated bootstrap diode and a shutdown mode with a separate input pin to minimize system power consumption.
The STGAP2SiCSNTR is available in the 5 × 4 mm-wide SO-8N package, priced from $1.25 for 1,000-piece orders. Click here for more information about STMicroelectronics’ STDRIVE gate drivers.