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  • UC3823A: UC3823A duty cycle

    TI Thinks Resolved
    Part Number: UC3823A Other Parts Discussed in Thread: UC1825 , UC1823 Short description: Unable to obtain PWM duty cycle of less than 30% with UC3823A.Case details or comments: When error amplifier output voltage (pin 3) is lowered, the duty cycle reduces…
    • Answered

  • UC3823A: Pspice model

    Resolved
    Part Number: UC3823A Other Parts Discussed in Thread: UC3825A Hi Team, Customer is asking if we can provide UC3823A or 3825A spice model? Thanks! Andrew
    • Resolved

  • RE: UC3823A: pin9 - Ilim: temp coefficient

    Thanks! Very helpful! Have a good day! Andrew

  • UC2825a UC3825a UC3823a UC2823a UC isolated feedback

    TI Thinks Resolved
    Other Parts Discussed in Thread: UC2825A , TL431 Hello, I'm using the UC2825a for a voltage-controlled halfbridge converter. I need help for the isolated feedback. Because of the 1.25-V-Ramp-offset and the comparator-offset, the output of the integrated…

  • UC3823 vs UC3823A

    Other Parts Discussed in Thread: UC3823A , UC3823 I am considering using the UC3823 PWM controller but I noticed that there is a UC3823A version also available. I would consider using the A version except that I will be driving SiC FETs so I need 20 volts…
    • Answered

  • UC3823a

    Resolved
    Other Parts Discussed in Thread: UC3823A Hello. I'm building a buck dc/dc power supply with the UC3823a pwm controller. How do I control the Pwm signal? I don't understand how i should calculate the value of my resistors and capacitors. Can anyone help…
    • Resolved

  • UC3823A sync problem

    Other Parts Discussed in Thread: UC3823A Using the circuit in Figure 10 on Page 9 of the UC3823A spec sheet does not work on the bench or in simulation at 19.5 kHz unless replacing 39pF with 4700pF, 120 ohms with zero and 22 ohms with 16 ohms. Using Rt…

  • UC3823A current limit problem

    When increasing power FET current to test the ILIM function I find that the output goes low as it should when ILIM is exceeded, but a single 5 usec pulse appears at the output about 800 usec after the ILIM comparator trips. Soft start C = 10uF, Rt = 42…

  • UC2825B: Techinical Document on how to set up switching MOSFET

    TI Thinks Resolved
    Part Number: UC2825B Other Parts Discussed in Thread: UC3823A , UC3825A , UC2825 I am searching for ways to set up the UC2825B for a flyback converter DC to DC; however, the its datasheet is very generic without pointing into how to set up the circuitry…

  • UC2825B: Technical questions

    TI Thinks Resolved
    Part Number: UC2825B Other Parts Discussed in Thread: UC3823A , UC3825A , UC2825 Team, My customer has been using this PWM Controller UC2825BN in a flyback converter for 20+ years. They are changing a few parts around this circuitry, especially the…

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