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BUF634A: drive high power LDMOS's gate at 42MHz?

Art Mecina
Genius 16505 points
Part Number: BUF634A
Other Parts Discussed in Thread: BUF634, OPA2677

Hello Guys,

Good day.

Our customer is planning to use the BUF634A to directly drive the gate of a power LDMOS with this device at 42.3MHz. Ideally he would be driving a sine wave with a peak of about 10 Volts, and a negative peak of about -1 volts. Is this possible?

He wants to eliminate the gate drive transformers, and ldmos gate drivers and drive the gates directly with the BUF634. He is trying to drive a BLF189XRA (from Ampleon) used for their 150 Watt CO2 lasers.

Thanks in advance!

Best regards,
Art Mecina
Texas Instruments Customer Support

  • 0
    Guru 47485 points

    You would need to find a sim model, but these input C numbers might be an issue, Just working through numbers, 11Vpp at 42Mhz requires a slew rate of 1450V/usec. If you actually did that into 650pF, that will require a peak current of 940mA, and then you have to work on stability - probably a small series R - The OPA2677 might be able to do this, its peak output current exceeds 1.5A. 

    And it appears this part is NRND