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TPS610986: The output voltage variation in burst mode at light load (10uA)

Yasushi Fujiwara
Genius 11755 points
Part Number: TPS610986

Hello Experts,

My customer is evaluating their trial board. Customer mentioned that TPS610986 output in burst mode at light load (10uA) showed 3.5V by some boards. So customer would like to know how much variation of the output voltage does TPS610986 have. The spec is stated only typical value (3.4V). Would you please tell a variation of the output voltage in burst mode at light load?

Best Regards,
Fujiwara

  • 0
    TI__Mastermind 21565 points

    Hi Fujiwara:

    May I know how customer measure the Vout? 

    Actually, we only have a typical value for Vout in burst mode. Typically, it's 3% higher than non-PFM.

  • 0 in reply to Minqiu Xie
    TI__Genius 11755 points

    Hi Minqiu,

    Customer measured the vout by a digital multimeter. (The device was operate with the actual load.) I got a question from customer as follows. Would you answer it?
    - This device changes the mode between PWM mode and PFM(burst) mode. This device monitor the ripple current of inductor, if ripple current is less than 100mA then device is into discontinuous current mode. If the ripple current is reduced more, then device is into burst mode, correct? If so, customer would like to know what is the threshold of load current to change the each mode. I think figure 36/37 in datasheet are a good examples. Is my understanding correct?

    Best Regards,
    Fujiwara

  • 0 in reply to Yasushi Fujiwara
    TI__Mastermind 21565 points

    Hi Yasushi:

    Yes. There are CCM, DCM, and Burst. The 100mA (typical) is CCM-DCM boundary. With more light loading, the converter will enter into Burst mode. During the burst mode, the Vout will be a little higher than normal target. 

    For the value enter into Burst mode, it's hard to give. Customer can use the EVm or do the test in their board to get some typical result.