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UC3846: UC38846

Satyanarayana Arimanda
Prodigy 30 points
Part Number: UC3846
Other Parts Discussed in Thread: UCC28070, UCC28950, PMP6712, UCC28180, PMP8740, TIDA-00779, UCC28951

Can i use the current sense pins of the IC to measure output current using sense resistor. In the description it is given that peak switch current, May i know the correct function of the current sense pins.

  • 0
    TI__Mastermind 31580 points
    Hi Satyanarayana,

    What power supply topology do you intend to use the UC3846 in ?

    The UC3846 is designed to provide cycle by cycle current mode control of the power stage and it needs to monitor the primary side switch current to do this.

    There area number of technical articles on current mode control in the TI power supply design library such as

    www.ti.com/.../slup098.pdf
    www.ti.com/.../slup173.pdf

    TI has a large number of PWM controllers, if you give me your application details like input voltage range and output voltage and current I may be able to recommend another controller or TI reference design.

    Regards

    Peter
  • 0 in reply to Peter Meaney
    Prodigy 30 points

    Thanks peter for the reply

    I have choosen full bridge topology since my power rating is nearly 1.5kw. input voltage is 230 V ,50 hz and output voltage is 54.6 V , current is 25 A. I need the feedback from the output so i can switch to suitable mode (CCCV) using controller

    Thanks

    Satya.

  • 0 in reply to Satyanarayana Arimanda
    TI__Mastermind 31580 points

    UCC28070 (-Q1)

    PR779 A 1.2kW Universal Input Interleaved CCM PFC Power Board

    http://www.ti.com/tool/pr779

    85 - 270 VAC

    390 V

    1200 W

    X

    X

     

    CCM Interleaved PFC boost

    UCC28950 (-Q1)

    PMP6712 Dual-Channel Full-Bridge Converter (54V @ 30A) for PoE Power Sourcing (PSE)

    http://www.ti.com/tool/pmp6712

    38 - 60 V

    54 V

    1600 W

    X

    X

    X

    PSFB

    UCC28950 (-Q1) + UCC28180

    PMP8740 Design Review of a 2-kW Parallelable Power Supply Module

    https://www.ti.com/seclit/ml/slup349/slup349.pdf

    90 - 265 VAC

    20 - 32 V

    2000 W

     

    X

     

    CCM PFC boost + PSFB

    UCC28070 (-Q1)

    PMP4259 Pre-Regulator for Air Conditioner 390Vdc Output with 3kW

    http://www.ti.com/tool/pmp4259

    90 - 264 VAC

    390 V

    3000 W

    X

    X

     

    CCM Interleaved PFC boost

    UCC28180

    TIDA-00779 230-V, 3.5-kW PFC with >98% Efficiency, Optimized for BOM and Size Reference Design

    http://www.ti.com/tool/TIDA-00779

    190 - 270 VAC

    390 V

    3500 W

     

    X

     

    CCM PFC boost + PSFB

    UCC28070 (-Q1)

    PMP4311 5KW Interleaved CCM Power Factor Correction Converter

    http://www.ti.com/tool/pmp4311

    180 - 264 VAC

    400 V

    4800 W

    X

    X

     

    CCM Interleaved PFC boost

    Hi Satya,

    You will need a two stage design, Power Factor (PFC) front end + Phase Shifted Full Bridge (PSFB) dc/dc isolation stage. The PFC can be used to generate a 380V to 400V DC voltage and the PSFB can be used to step the voltage down through an isolation transformer.

    The UCC28180 is an 8 pin CCM PFC controller which can be used up 10kW and the UCC28070 is a two channel interleaved CCM PFC which is also suitable for high power PFC designs.

    The UCC28951 is the latest version of the PSFB controller and is very popular in this application space especially for CV and CC modes of control.

    Regards

    Peter

  • 0 in reply to Peter Meaney
    Prodigy 30 points
    Thanks for the reply peter.
    This resolved my issue.