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  • UC1843A: How long time if overvoltage - UC1843

    Part Number: UC1843A Hello, In the frame of a space appplication (Exomars2020 mission), we have selected this référence : UC1843J883B (5962-8670402PA) in CDIP-8 package. The maximum absolute rating (following the datasheet) is 30V. The question…

  • UC1843 SYNC Pulse Voltage

    Other Parts Discussed in Thread: UCC28C43 , UC1843 What is the maximum voltage that can be applied to the RT/CT pin when synchronizing the converter? Thanks for your help with this! Richard Elmquist
    • Answered

  • UC1901-SP: Avoiding the 2.5V Feedback Offset in Reference Design UC1843BEVM-CVAL

    Resolved
    Part Number: UC1901-SP Other Parts Discussed in Thread: UC1843BEVM-CVAL , UC1901 , UC1843-SP , UC1843 , UC1843B-SP Hello, I am designing a power supply using the UC1901-SP for isolated feedback. In the reference design for the 'UC1843BEVM-CVAL' eval board…
    • Resolved

  • UC1843 PWM dc-dc up converter

    Other Parts Discussed in Thread: UC1846 , UC1843 , UC1825 , UC1901 , UC1843A I'm looking for application reference information (reference schematics, app notes, etc). The information provided in the data sheet is very sparse. The application is a forward…

  • Externally synchronizing UC1843

    TI Thinks Resolved
    Other Parts Discussed in Thread: UC1843A , UC1843 To externally synchronize a UC1843 or UC1843A PWM, the free running frequency must be lower than the synchronized frequency. How much lower does it have to be? More specifically, how high can the free-running…
    • Answered

  • UC1843 failing to startup

    Resolved
    No gate driver operation. Anyone have any ideas? Controller was operating with fairly large capacitor on VCC, 22uF. Attempted reducing size to reduce delay time to start. Now, after VCC rises to UVLO turn ON level of 8.4V, oscillator starts but no gate…
    • Resolved

  • UC1843A: Frequency Response

    TI Thinks Resolved
    Part Number: UC1843A Other Parts Discussed in Thread: UC1843 Is there a frequency response model available for the UC1843/3843 PWM? Have you any recommendations for modelling the device?

  • Spice Model for UC1843-SP Internal Error Amp

    Hi, I'm looking for an accurate gain-phase model for the error amp inside the 1843 PWM for use on a space product. Thanks

  • LM5025: LM5026; LM5030;LM5020

    TI Thinks Resolved
    Part Number: LM5025 Other Parts Discussed in Thread: LM5020 , UC1843 , I am working with a power supply project. The project has two power module which switching frequency must be between 400kHz ~ 600kHz. module 1 : Vin 20V~34V ; Vout : +5V/16A -5V0.5A module…

  • Buck converter design using UC1843

    Other Parts Discussed in Thread: UC1843 Hello. I am a power supply circuit designer . These days, I'm designing the buck converter using UC1843 (military application) So the rough circuit concept and specification are the below 1. Input voltage range…

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