• LTC3891 -PLL Input

    Has anyone used the PLLIN/MODE for external synchronization?

    I've tried all the options shown on the evaluation board schematic and had no luck.

    Other circuits that I've designed recently using the LTC3895 and LTC3858-1, have both worked as described…

  • LTC3891 PLLIN

    Sorry, repeat question that I asked in the wrong forum.

    Has anyone used the PLLIN/MODE for external synchronization?

    I've tried all the options shown on the evaluation board schematic and had no luck.

    Other circuits that I've designed recently using…

  • LTC3891 - Over-temperature Protection?

    Hi,

    We use the LTC3891 controller in our buck design, 24V to 5V, 1.4W.

    We have performed some thermal characterization tests on our design up to 175°C and maybe more, depending on oven calibration (less than 200°C).

    The 5V buck has been turned…

  • LTC3891 support 12V/20A

    Hello

                Could LTC3891 support 54VIN to 12V/20A (non-isolate) ? What is max OCP of LTC3891? Thank you.

    BR

    Patrick 

  • LTC3891 RUN pin noise

    I am currently utilizing the LTC3891 with a 499k between PWR and RUN and a 100k between RUN and GND.  I do not need the UVLO function, and I believe I am potentially picking up noise on this device that is causing the RUN pin to go low.

    The LTC3891 says…

  • RE: LTC3891 - maximum voltage adjustment range ?

    Hello,

    the limitation towards 24V comes from the current sense opamp inside the LTC3891. The SENSE+ and SENSE-  pins have an absmax rating of 28V. So if you go beyond 24V internal opamps will not work properly AND (more severe) is a possible failure reason…

  • LTC3891 low output current

    I cannot reach the design current of 6A with this IC.

    The maximum current I can achieve is ~1A, if I increase the load further the gate drive signals clash. I have experimented with adding additional capacitors in the input, output and after the output…

  • 请教一下关于LTC3891开关电源遇到的开关频率调节问题

    LTC3891测试.rar最近在使用LTC3891做DC-DC时,遇到这个问题:在进行开关频率调节的时候,根据数据手册所给的要求,对FREQ引脚的下拉电阻进行不同值的调试,同时也进行了分别接到GND和INTVCC两种状态去调试,发现TG和BG上的频率与数据手册所给的频率图表对不上,每一值都相差10倍左右,测试时是将MOS断开进行测试的,请问这是什么情况?附件中为我的测试记录和原理图。

  • RE: LTC3891IFE现在需要调整电阻使输出电压为5V,输出电流可以达到多少

    LTC3891是控制器,输出电流主要和外部功率器件相关,可以去到5A以上

  • RE: LTC3372

    We will not have an LTC3372 LTPC model for a few months. Meanwhile, the LTC3891 LTPowerCAD model or LTspice model can be used to model the LTC3372 HV converter.