• RE: LTC7149 for -28V genaration from +28V input

    Hi Shivakumar D,

    The LTC7149 looks good for this application. LTC7149 Datasheet and Product Info | Analog Devices

    You can try the design on page 23 of the datasheet then modify it to get -28Vout or get hold of the DC2354A demo board which should work within…

  • LTC7149 behavior

    Hi everyone. I have some problem with the LTC7149. In the picture there is the SW to Vout-=-5V (red) pin and the Vin=6V to SW pin (blu) The RT resistance is 249k so the fsw =400kHz. However the bottom switched is turned off before the next clock cycle…

  • LTC7149

    Hi all,

    I have build -12V voltage regulator with LTC7149. Input voltage is 12V. After 8 hours with 1.5A load capacitor C7 exploded.

    have anybody idea why it happen?

     PDF

  • LTC7149 problems

    i have some problems with the LTC7149EUFD#PBF. 

    I am using this regulator to convert 24V input to -5V output.  I designed the schematic based on the datasheet and i simulated the schematic with the LTSPICE. It worked well.

    But during testing, when i gave…

  • LTC7149 SYNC

    Does the SYNC pin Phase Locked Loop synchronize to an edge?  Does duty cycle of the SYNC signal affect the duty cycle of the converter?

  • LTC7149 voltage drop compensation

    Hello,

    Our design requests output current measurements in -5V 0.5A buck converter. We use the external 100mR resistor for current measurement. We modeled the circuit with LTC7149 and simulation circuit requested some special connections for the stable…

  • Problem with LTC7149

    Ladies and Gentlemen,

    we have the comparable problems as it is described in the discussion:
    ez.analog.com/.../323476

    Unfortunately, we could not understand what mistakes the customers were supposed to have made there.
    Their error description is very similar…

  • Question about LTC7149 LTpowerCAD model

    Hi,

     

    I can not download the following LTpowerCAD model of LTC7149 on its website.

    “LTC7149 Project – Inverting Buck Regulator (3.5-55V to -5V@4A)”

     

    Is there any problem on that file?

    If possible, could you send me the new one? 

     

    Thanks…

  • 用LTC7149将+12V转-12V给运放供电,变换器不启动的问题?

    您好!用LTC7149将+12V转-12V,正负12V给运放供电,发现+12V转-12V变换器不能正常启动,空载能启动,

    经查是由于启动前,+12V通过负载(RL)VOUT-到下边同步MOS管的体二极管至输出电感到GND存在电流通路,

    由于存在此电流通路,启动时芯片内部应该启动保护了,再也启动不了了。

    目前的解决办法:在-12V输出并联了一只肖特基二极管(导通压降为0.2V)将上述通路进行旁路后,+12V转-12V变换器

    就能正常启动了。

    问题:存在上述电流通路,芯片内部启动了什么保护?机理是什么样的…

  • 用LTC7149将+12V转-12V,正负12V给运放供电,变换器不能正常启动

    您好!用LTC7149将+12V转-12V,正负12V给运放供电,发现+12V转-12V变换器不能正常启动,空载能启动,

    经查是由于启动前,+12V通过负载(RL)VOUT-到下边同步MOS管的体二极管至输出电感到GND存在电流通路,

    由于存在此电流通路,启动时芯片内部应该启动保护了,再也启动不了了。

    目前的解决办法:在-12V输出并联了一只肖特基二极管(导通压降为0.2V)将上述通路进行旁路后,+12V转-12V变换器

    就能正常启动了。

    问题:存在上述电流通路,芯片内部启动了什么保护?机理是什么样的…