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DRV2510-Q1: DC drive and power figures?

Tim Gipson
Prodigy 170 points
Part Number: DRV2510-Q1
Other Parts Discussed in Thread: DRV8662, DRV2624, DRV2625

A couple questions regarding this part.

1) Is this part suitable for driving a DC current (or waveform with substantial DC component) into a voicecoil rated for DC operation?

1a) There is a "dc detect" feature vaguely mentioned in the datasheet exactly one time (sec. 7.3.4.1), but never again. Additionally, there is a DC_OFFSET ("DC offset protection occurred") fault bit listed in the register map according to the Haptic Control Console software; however, in the datasheet this bit is listed as RESERVED. Is there in fact a DC offset protection feature, and if so, can it be disabled?

2) What are the operating limits of this part? It is stated to deliver 3A (peak), however, the datasheet suggests it is intended for very short (low duty cycle) waveforms rather than continuous operation. There doesn't seem to be much information for calculating the part's power dissipation for a given waveform & loading conditions. Is there thermal data available to evaluate the part's suitability for particular combinations of load and waveform/duty cycle?

Thanks!

  • 0
    TI__Guru** 108685 points
    Hi Tim,

    The output driver of DRV2510-Q1 is a Class-D with BD modulation, some examples of the output signals can be found on data sheet figures 18 to 21: www.ti.com/.../drv2510-q1.pdf
    As you mention, 3A is peak current. From the spec you can see that overcurrent limit is 3.5A. This device has a thermal pad on the bottom side, so heat dissipation depends on the board design.

    Best regards,
    -Ivan Salazar
    Applications Engineer - Low Power Audio & Actuators
  • 0 in reply to Ivan Salazar
    Prodigy 170 points
    Thanks for the feedback. However, it seems that all of the application curves shown have an active duration of <10msec, which doesn't help me understand how the part would perform in a DC / servo application (or maybe it does! Although related TI parts such as DRV8662 will happily drive a DC load indefinitely despite the datasheets seemingly trying to ward off this behavior). Additionally, I'd like to know if the "DC detect" feature hinted at by the application software is active (or may be turned on in a future chip rev) and may create a problem for this type of application.

    Thanks!
  • 0 in reply to Tim Gipson
    TI__Guru** 108685 points
    Hi Tim,

    I'm checking out the discrepancy between GUI and data sheet register information with the rest of the team.
    I'll provide you an update early next week.

    Regarding your intention to drive a DC signal to the actuator, what kind of actuator are you using? Do you have a data sheet that show more details about it?
    There are devices like DRV2624/DRV2625 that drive LRA and ERM actuators. ERM are basically DC motors so these devices can be configured on ERM mode to drive the PWM duty cycle as DC voltage.

    Best regards,
    -Ivan Salazar
    Applications Engineer - Low Power Audio & Actuators
  • 0 in reply to Ivan Salazar
    TI__Guru** 108685 points
    Hi Tim,

    We got a conclusion on this (before than what I expected):
    - DRV2510 features DC protection. So this device cannot be used to drive DC signals to the actuator.
    - DRV2511 does not feature DC protection. So this device can be used to drive DC signals to the actuator.

    Based on this you can change from DRV2510 to DRV2511 in order to drive DC signals.

    Best regards,
    -Ivan Salazar
    Applications Engineer - Low Power Audio & Actuators