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UCC27532: UCC27532

Vivek Sen
Prodigy 90 points
Part Number: UCC27532
Other Parts Discussed in Thread: UCC28600, , UCC27531, UCC27538

Tool/software:

UCC28600 is QR flyback IC, is there any issue when use with UCC27532 Sic Mosfet gate driver?

QR operation will not be disturbed when using with UCC27532

output of UCC27532 is same UCC28600?

  • 0
    TI__Genius 14145 points

    Hey Vivek,

    Thank you for your questions regarding the UCC27532.

    You will need to create a thread with the UCC28600 to inquire about the QR operation when driving the inputs of a gate driver.

    The UCC27532 and the UCC28600 both feature a low-side gate driver that either pull the gate up to VDD or pull it down to GND. If the SiC MOSFET requires negative voltage for turnoff, we can suggest a different low-side driver as well.

    Let me know if there are any questions.

    Thank you,

    William Moore

  • 0 in reply to William Moore
    Prodigy 90 points

    Hi,

    Actually, I don't have negative supply to bias negatively Sic mosfet.

    So, I choose this one. 

    what is difference between UCC27532 and UUC027531, can I use both as one-to-one replacement?

    Or extra care needs to take during operation when replacing by each other in single circuit?

  • 0 in reply to Vivek Sen
    TI__Genius 14145 points

    Hey Vivek,

    The UCC27532 has CMOS compatible input thresholds that are dependent on VDD levels. When VDD is at or below 18V, the rising input threshold is approximately 55% of VDD and for the falling input threshold it is 45% of VDD. At 18V VDD and above, the input thresholds are set to be the same as 18V VDD.

    The UCC27531 has TTL compatible input thresholds which allow for 3.3V or similar MCU outputs to control the gate driver.

    So, your control signal is what determines which of these drivers you need to use.

    Thank you,

    William Moore

  • 0 in reply to William Moore
    Prodigy 90 points

    Hi,

    I am not using external microcontroller, I am using QR Flyback PWM IC.

    And the output of this IC will be 48Khz PWM signal swing between 18V high and 0V Low (i.e. GND).

    Kindly advise me accordingly.

    Second Question as below.

    Can I Use UCC27538 in place of UCC27532 for my sic mosfet? Both are from same family & also mentioned in datasheet use for SIC mosfet.

  • 0 in reply to Vivek Sen
    TI__Mastermind 23215 points

    Hello Vivek,

    TI has an official holiday on July 4th and E2E responses will be delayed until the beginning of next week, July 7th. William will respond back when the office is open next week.

    Regards

  • 0 in reply to Richard Herring
    TI__Genius 14145 points

    Hey Vivek,

    If your controller is outputting 18V for high and 0V for low, either of these parts will work as their input pins are rated at 27V abs max. The CMOS style inputs of the UCC27532 may be more suitable for turn on-off thresholds with them being dependent on VDD.

    The UCC27538 would also work as they are all a part of that UCC2753x family and have input pins rated for 27V abs max, but it also has TTL compatible input thresholds.

    Thank you,

    William Moore