Regulated SMT DC-DCs suited to gate drive power

RECOM is simplifying the generation of gate drive bias voltages for a range of switch types with its new R24C2T25 DC-DC converter. Available in a convenient and cost-effective, 7.5mm x 12.83mm 36-pin SSOP package, the part operates from 21-27VDC input and supplies programmable, regulated asymmetric dual output voltages, ideal for gate drivers for IGBT, Si, SiC, and GaN cascode switches. External resistor networks can set the 2W-rated R24C2T25 to provide a range of +2.5VDC to +22.5VDC on one output and -2.5VDC to -22.5VDC on the second, with an overall voltage sum of 18VDC to 25VDC, for example +15/-3V, to drive SiC MOSFET gates efficiently. Voltages are maintained within +/-1.5%, preventing the risk of over-voltage and damage.

Isolation of the converter is 3kVAC/1min with an ultra-low coupling capacitance of 3.5pF and a common mode transient immunity of +/-150V/ns. The parts are ideal for powering high-side gate drives with fast voltage and current power switching edges.

Temperature rating is up to 82C ambient at 2W output with 2.5W available to 75C. Useful derated power is also provided to the package with a maximum of 125C.

The converter is fully featured, with soft start, input over-voltage and under-voltage lockout, thermal shutdown, and output over-power protection. Output over-voltage and under-voltage lockout are also supplied to ensure invalid gate voltages cannot stress power devices. A power-good signal and ON/OFF control are provided to put the device into standby mode with less than 700µA current draw.

“Providing precision gate drive voltages is vital, especially for the latest wide band-gap devices,” comments Matthew Dauterive, DC-DC product manager of RECOM. “The R24C2T25 can be set for the optimum voltage levels for the best combination of system efficiency and safety.”