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DRV8262: Drive TEC problem

li yu
Prodigy 40 points
Part Number: DRV8262

Tool/software:

Hi

  I use DRV8262 to drive TEC and have the following two issues.

  1. As for the rated current mentioned in the manual, may I ask what this rated current refers to?

   2. I use DRV8262, single bridge mode, drive 12V/3A TEC, the output end has serious overshoot, please see how to solve it. thank you

  • 0
    TI__Mastermind 44325 points

    Hello Li,

    Thank you for posting. Could you please confirm if you use LC filtering in the output before the TEC connections? Please also confirm if you use slow decay setting for the DECAY. Typically for TEC driving a higher frequency PWM is used as well as LC filters for filtering the output to TEC with least ripple drive. See this E2E with some actual testing with the DRV8262 and TEC, https://e2e.ti.com/support/motor-drivers-group/motor-drivers/f/motor-drivers-forum/1327477/drv8262evm-driving-tec?tisearch=e2e-sitesearch&keymatch=DRV8262%252525252520TEC#.

    Looks like you are using 1.25 kHz PWM perhaps to minimize switching losses. 

    li yu said:
    1. As for the rated current mentioned in the manual, may I ask what this rated current refers to?

    The peak current is the current that can be supported for short durations. The continuous current that can be supported depends on the power dissipation and thermal design of the PCB. For the DRV8262 each H-bridge can support up to 5A continuous current subject to thermal design.

    li yu said:
    2. I use DRV8262, single bridge mode, drive 12V/3A TEC, the output end has serious overshoot, please see how to solve it. thank you

    We've never seen overshoot in the test setup we have. Could you pleas confirm is slow decay was used? Did you use a TI EVM or your own circuit board?

    Thank you.

    Regards, Murugavel