• State
  • Locked Locked
  • Replies 1 reply
  • Subscribers 62 subscribers
  • Views 135 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TPS92513HV: TPS92513HV stability consult with 56Vin 44Vout 1A and no PWM dimming

Jimmy Zhou95
Intellectual 870 points
Part Number: TPS92513HV
Other Parts Discussed in Thread: TPS92512, TPS92513

Hi team,

The problem is that output waveform is not stable. When they configure output frequency to 130kHz with Vin 56V, Vout 48V, 1A load and no PWM dimming, the duty cycle varies in time domain.

Besides, here is some questions arising from my customer:

1.In our datasheet, we have COMP pin for compensation. Can we connect Res/Cap for compensation? Do you have some calculations here? Otherwise, do you have small signal model base of this device?

2.In our datasheet, we have slope compensation structure inside. Can you offer more details about slop compensation?

3.Do we have maximum duty limitation inside our IC?

Jimmy

  • 0
    TI__Mastermind 28655 points

    Hello Jimmy,

    I have some questions on your design:

    What is being used for comp?  What is the inductor value?  Is the load LEDs?  What is the output capacitor value?  What is the inductor current ripple for your design?

    1)  Yes, a resistor/capacitor can be use.  We don't have calculations for that.  You could sweep the loop to get a gain/phase picture.  Also try searching on the TPS92512, there is more information on it and it operates similar to the TPS92513.

    2)  I do not have information regarding the slope compensation of this part.

    3)  This part can operate to 100% duty cycle requiring a boot capacitor refresh when boot uvlo occurs (this is a switch cycle to allow boot fresh), see section 8.4.3 starting on page 13 of the datasheet.

    Best Regards,