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UCC12050: Output power specification

Kuramochi Tadahiko
Guru 28715 points

Part Number: UCC12050

Hi,

My customer is considering using UCC12050.

They would like to know if UCC12050 can output 550mW surely.

However, I can not find specifications regarding output power.

Is the maximum output power guaranteed?

Best Regards,

Kuramochi

  • 0
    TI__Mastermind 33135 points

    Hi Kuramochi,

    Section 6.12, pages 10-11 of the UC12050 data sheet show our temperature derating curves for all VISO output voltage settings and the range of allowable input voltage, VINP. One example for VISO-5V is shown below. You can see that if 550 mW is required, this is only possible for -40 C<T<25 C when VINP=5 V or -40 C<T<105 C for VINP=5.5 V. Thanks for connecting through E2E.

    Regards,

    Steve M

  • 0 in reply to Steven Mappus1
    Guru 28715 points

    Hi Steve-san,

    Thank you for your help.

    How much is the dispersion of the maximum output power at VINP=VISO=5V, Ta=25℃?

    Best Regards,

    Kuramochi

  • 0 in reply to Kuramochi Tadahiko
    TI__Mastermind 33135 points

    Kuramochi,

    From my previous response, for VINP=VISO=5 V, TAMB=25 C, PISO=550 mW. The efficiency curves given in the UCC12050 data sheet only show nominal values such as VINP=VISO=5 V, TAMB=25 C, PISO=500 mW. From the curve below, it seems the efficiecny over one additional division would mainatin 60% at IISO=110 mA (550 mW case):

    Calculate the total input power as:

    PIN=PISO/0.6=550 mW/0.6=917 mW~920 mW

    Calculate the UCC12050 power dissipations as:

    PDISS=PIN-PISO=920 mW-550 mW=370 mW

    Junction-to-ambient and junction-to-case, thermal impedance from the UCC12050 data sheet:

    RJA=57.5 C/W

    RJC=21.4 C/W

    Calculate estimated junction temperature at TAMB=25 C:

    TJ=[RJA*PDISS]+TAMB=(57.5 C/W*370 mW)+25 C=46.275 C

    Calculate estimated case temperature:

    TC=TJ-(RJC*PDISS)=46.275 C-(21.6 C/W*370 mW)=38.3 C

    Below is a thermal image for VINP=VISO=5 V, TAMB=25 C, PISO=500 mW

    The calculated case temperature is 38.3 C for PISO=550 mW compared to the measured case temperature of 40.7 C for PISO=500 mW. The results are very close but not exact due to emissivity setting of the thermal camera, exact room temperature, etc.

    Thanks for connecting through E2E!

    Regards,

    Steve M  

  • 0 in reply to Steven Mappus1
    Guru 28715 points

    Hi Steve-san,

    Thank you for your help.

    How much is the manufacturing dispersion of PISO for our reference?

    I would like to know that how much power UCC12050 can output actually.

    Best Regards,

    Kuramochi

  • 0 in reply to Kuramochi Tadahiko
    TI__Mastermind 33135 points

    Kuramochi

    For the parameters you provided, VINP=VISO=5 V,  T=25 C, you can expect 550 mW of output power as the worst case. This is according to what TI has committed to from the data sheet curves I’ve used in my calculations. The data sheet temperature curves are taking process and tolerance into  consideration. TI also applies some guard band limits to assure manufacturability but these limits are not shown in the data sheet. We don’t want customers designing beyond the power and temperature derating guidance provided in the data sheet.  I hope the analysis I’ve provided helps  assure you of the advanced process, packaging and integration capabilities of  this exciting technology. Thanks for connecting with us through E2E.

    Regards,

    Steve M