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UCC28600 RUN LOGIC ISSUE

ASHOK SIHAG
Prodigy 100 points
Other Parts Discussed in Thread: UCC28600, BQ24600

DEAR SIR/MADAM,

I am using the IC UCC28600 for 65-W charging application.I used the same circuit as per the EVM doc sluu263c. http://www.ti.com/lit/ug/sluu263c/sluu263c.pdf

While testing the board, i observed the value like (VDD= VARYING B/W 8V TO 12.6V DC,Vovp=2.9V, Vfb= approx 0V).In the control circuit flow diagram it is mentioned that RUN will be logic LOW if  VREF<4V.

**decoupling cap & other critical component placed as per EVM guidance**

Q1:What could be the possible reason that VDD is not reaching >13V?

Q2:I used the same component for the Rovp1,Rovp2,Rpl & Rcs,transformer ( as per the EVM ) as my Voltage requirement is also same , so is there any other component which can effect the performance??

Q3:VREF is almost 0 volt ,VDD is varying bw 9V to 12.5V DC.....What could be the reason??

Please provide your valuable suggestion..

Thanks in advance..

with regards

ASHOK KUMAR SIHAG

PH:9242665332

  • 0
    Prodigy 100 points

    I got the solution....I am getting vout 18 V.......Soft start is also happening.....Still one issue...

    After the ucc28600 adapter portion i used the IC BQ24600 to charge the battery(type Li-ion) with 16.8V in same PCB.

    It is charging the Battery with 16.8v@3A(as per Iset) but transformer making the sound (like air is leaking from tube).

    When i am checking the adapter portion(ucc28600) only with resistive load(rheostat) there is no sound (16.8V@3amps).If i am checking the BQ24600 portion(powered from other power supply)only, it is charging the battery with16.8V@3amps without sound.When i am using the both circuit (belongs to ICucc28600 & BQ24600 ) then only sound is coming.

    what could be the cause of this issue???

    If ripple then how we can reduce the same.....??

    plz help

    thanks in advance

    WITH REGARDS

    Ashok Kumar Sihag

    ph:9242665332