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LM48580: questions regarding parameters from its DS

Victor Levy
Intellectual 2406 points
Part Number: LM48580
Other Parts Discussed in Thread: DRV2700

Hello, 

I have to following questions asked by customer for this device,

 "I don’t understand some parameters from it DS

  1. Can it operate with 4KHz  buzzers?  As I see from the chart below, it optimized to work up to 200 Hz, and at 1-2KHz it gain is decreased.

 

  1. What is the output current? I see that these parameters were measured with RL = 6uF + 10 Ohm; I should verify that it can support with parameters as below (see also attached DS):

AT-1438-TWT-R.pdf

Thanks.

  • 0
    TI__Guru* 84915 points

    Hi, Victor,

    Please take a look at my answers below and let me know if you have additional questions or comments.

    1.- Yes, the LM48580 can operate at 4KHz frequencies, but as you correctly mentioned its performance is degraded at this frequency range. The most important thing when selecting a haptics driver is to ensure that the device is capable to handle the load capacitance. I see that the buzzer has 13nF of capacitance. This value is acceptable by the device since it is designed to work with capacitor values of uF order. 

    I would also recommend to take a look at the DRV2700 ( http://www.ti.com/lit/ds/symlink/drv2700.pdf ), this device can handle higher frequencies without risk to degrade its performance.

    2.- The current is limited by the boost converter. This device has a limited output current of 1.1A. In case of the DRV2700, its output current can be modified by a external resistor. It can be up to 2.3A.

    Best regards,
    Luis Fernando Rodríguez S.