• LTC3805-5 seems working incorrectly

    Hello, I am going to use LTC3805-5 as the controlling circuit of a flyback converter.

    Firstly, I built a small circuit to get some knowledge of the chip. The schematic is shown below:

    The components in the shadow are not installed on the pcb. It is…

  • LTC3805-5通电后没有反应

    Hi,

    我在使用LTC3805-5设计flyback converter时,发现通电后LTC3805-5的GATE引脚没有输出驱动信号。VCC和RUN上有电压,都是5V;FS引脚上没有看到任何波形。

    电路图如下:

    请问应该测量哪些引脚以判断该芯片是否正常工作?这些引脚上的波形大致是什么样的?

    另外,该芯片的GND引脚位于封装背面,请问如何手工焊接?焊接时需要注意什么?

  • Why LTC3805-5 restarts again and again?

    I have the following circuit.

    The components with cross over them are not installed on the board.

    I have made two boards and made a few measurement of the boards separately. Here is the result.

    board #1 board #2
  • LTC3805 issue in boost configuration

    Hello everybody,

    I'm working on a boost converter, used to boost a 400V input voltage up to 550V.

    The circuit is build around the LTC3805 but I figure out mainly a startup problem: after the controller issues 4-5 pulses, it stop to work. After some…

  • LTC3805 Ith Pin Clamp Voltage and current

    Hi All,

    I'm using the LTC3805 flyback in a configuration with feedback through an opto similar to the "typical application" on page 17 of the datasheet:

    However, I run the system at very light loads sometimes and I am wondering what the…

  • How to use the sync pin of the LTC3805

    Hello People,

    I'm using a LTC3805 in a sepic design and I have some questions regarding the sync input.

    I have a Vin of 19V to 24V, Vout of 20V and -20V at Iout(max) of 260mA and -200mA. I use two coupled inductors of 330uH and the sense resistor…

  • +-5 from single +5

    can you suggest any way to produce +-5 from +5.
    I need it for one 4ch differential signal summer op-amp plus salen-key filter op-amp.

    Is there any DC/DC converter or something in ADI that doing this?

  • RE: AD7091R-5

    Yes. The voltage range on the VDRIVE pin on AD7091R-5 is from 1.8V to 5.25V. However, the voltage on the VDRIVE pin must never exceed the voltage on the VDD pin by more than 0.3V for ADR7091R-5.

    For the AD7091R, the voltage on the VDRIVE pin can be anywhere…

  • LTC1693-5

    Hello,

    Do the transient thermal curves of part# LTC1693-5 allow its output to quickly charge a capacitor as depicted here? Less than several microsec charge time is desired. The datasheet lists Rth of 200 C/W, which suggests this is not possible, but…