600V three-phase gate driver adds smart shutdown for industrial designs

July 16, 2019 //By Nick Flaherty
STMicroelectronics has developed a 3-phase gate driver for 600V N-channel power MOSFETs and IGBTs that protects against negative voltage spikes down to -100V and responds to logic inputs in 85ns.
STMicroelectronics has developed a 3-phase gate driver for 600V N-channel power MOSFETs and IGBTs that protects against negative voltage spikes down to -100V and responds to logic inputs in 85ns.

The STDRIVE601 has smart shutdown circuitry that turns off the gate driver outputs immediately after detecting overload or short-circuit, for a period determined using an external capacitor and resistor. Designers can set the required duration, using large C-R values if needed, without affecting the shutdown reaction time. An active-low fault indicator pin is provided.

The STDRIVE601 replaces three half-bridge drivers to ease PCB layout and optimize the performance of 3-phase motor drives for equipment such as home appliances, industrial sewing machines, and industrial drives and fans.

All outputs can sink 350mA and source 200mA, with a gate driver voltage range of 9V-20V, for driving N-channel power MOSFETs or IGBTs. Matched delays between the low-side and high-side sections eliminate cycle distortion and allow high-frequency operation, while interlocking and deadtime insertion are featured to prevent cross conduction.

The gate driver is built in ST’s BCD6S offline process and operates from a logic supply voltage up to 21V and high-side bootstrap voltage up to 600V. Bootstrap diodes are integrated, saving the bill of materials, and under-voltage lockout (UVLO) on each of the low-side and high-side driving sections prevents the power switches operating in low-efficiency or dangerous conditions.

An evaluation board, EVALSTDRIVE601, is available to help users explore the features of the STDRIVE601 and quickly get first prototypes up and running.

The STDRIVE601 IC is in production now, housed in a SO28 package, and priced at $1.13 for orders of 1000 pieces.

www.st.com

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