Dirk,
The failure to start switching is usually caused by insufficient voltage on the BST pin capacitor. If the SW pin has residual bias from 5V and 24V output caps, there will not be enough voltage difference from VCC to BST to charge he BST capacacitor…
Other Parts Discussed in Thread: LM5007 , TINA-TI Hi all,
I am trying to simulate the model of lm5007 in PSpice 16.5 demo/trial version. Please help me the procedure how to simulate in it.
Thanks,
Bhushan
>Your electrolytic cannot respond fast enough to damp them and the ceramic is too small. So they feed into your switcher which passes the high frequencies straight through to your CPU and logic supplies.
The 85 volt input TI-LM5007 +5 bucking switcher…
Other Parts Discussed in Thread: LM5010 , LM5008 , LM5007 , LM5010A I've designed a DC/DC converter from 48V to 12V using LM5010.
The output gives just about 7V, which breakes down to about 3V when I connect an 1kΩ resistor.
I tested it with two…
In addition, TI has a lot devices can be used for your design. The LM5007 (80V rated), LM5018 (100V rated) constant on time buck regulator are good canaditates and ease of use.
Thanks for the reply, Greenja.
I will go over my grounding, and beef it up as a test.
I did do a "similar" layout in WebBench using the LM5007, but gained no insight to my problem, so I didn't think it worth mention.
Cheers,
R. Main.
I don't see any mention of that in the datasheet, but there are caveats like that in LM5007/8 datasheets. It may work with lower current like 500uA or so. You should however verify the operation across the whole VIN range.
Hope that helps.
Hi Akshay
Thaks for your suggestion. :)
Yes of course, I can use Webench, I also tried it, but It will be better to simulate in Pspice, in which we can check the input current waveform during starting and such things. The Pspice model for LM5007 is…
Other Parts Discussed in Thread: COT , LM5007 , LM5085 , LM34923 , LM5017 , LM5006 Dear comunity,
Can anyone give me an idea what is difference between adaptive on-time D-CAP2 mode and Adaptive Constant-On-Time (COT) control mode? I am not sure it…
