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  • UC1844A: Issues with compensation and IC not providing continuous PWM signals

    TI Thinks Resolved
    Part Number: UC1844A Other Parts Discussed in Thread: UC3844A Hi, I am using UC3844A IC for my Flyback simulation. Simulation input conditions, Frequency 200KHz, Output voltage is 20V. and Input current is 0.55A. Facing following Issues 1. Discontinuous…

  • RE: UC1843A-EP: UC1843A-SP Oscillator frequency bend and temp. effect

    Hi, There is a mistake in your design, RT is recommended to be large than 5kohm. If you want to limit the maximum duty at 50%, UC1844A is recommended. Regards, Teng
    • Answered

  • UC1844A / Off-Line Flyback Regulator

    Resolved
    Other Parts Discussed in Thread: UC1844A , UC1845A , UC2845A Hi Team, I would like to ask 2 questions about "Off-Line Flyback Regulator" in datasheet page.8. 1) Is it possible to operate if 9.5V DC is supplied instead of 117V AC? My customer also assumes…
    • Resolved

  • Alternative to UC1844a-EP for current mode control

    Other Parts Discussed in Thread: UC1844A-EP Hi, We have been using UC1844a-ep for a long time for Flyback converter. I saw on TI website that there are new generation of PWM converter, enhance mode. I am not able to really distinguish between new generation…

  • I need Pspice model for UC1844A & TLV3011? Please can you support.

    Other Parts Discussed in Thread: TLV3011 , UC1844A , UC3844 I need Pspice model for UC1844A & TLV3011? Please can you support.
    • Answered

  • LM5046 & UC1844A

    Resolved
    Other Parts Discussed in Thread: LM5046 , UC1844A , AMC1210 , ADS1205 , SM320F28335-HT , TMS320F2808 Dear Sir, I have a number of questions, relating to different power devices & topologies. Firstly, I note that you have a 'one eighth' brick design…
    • Resolved

  • Startup current and waveforms in the UC1844A

    Other Parts Discussed in Thread: UC1844A Im working on an "off the line" switcher from 277 VAC to 24 volts DC using the UC1844A in a double ended forward converter topology. I've followed the application note U-100A as closely as possible but s…

  • UC1845A-EP: Oscillator max frequency

    TI Thinks Resolved
    Part Number: UC1845A-EP Other Parts Discussed in Thread: UC1843A , UC1845A , UC1842A , UC1844A , UC1843A-EP Does the UC1845A-EP support a 1MHz oscillator frequency as shown in Figure 6 of the datasheet? The title page refers to "500kHz" operation but it…

  • UC2845A: How much temperature can UC2845A Junction be withstanded ?

    TI Thinks Resolved
    Part Number: UC2845A Other Parts Discussed in Thread: UC2843A , UC1844A , UC3844A , UC1845A , UC3845A , UC3842A , UC2842A , UC1842A , UC2844A , UC3843A , UC1843A Hi, Team. Could you tell me how much temperature how much temperature can UC2845A Junction be withstanded…

  • RE: UC3843A: Flyback Converter Design

    If you look at the device comparison table in the data sheet for this part then you will find it is better to use the UC1844A than the UC3843A because of its greater hysteresis between UVLO(on) and UVLO(off). Also this other part has a Dmax of 50% which…

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