Anston,
Joe found this App Note that looks like the problem he was seeing:
SNVA475A–March 2011–Revised April 2013
AN-2129 Boot Capacitor Regulation in LM25007 Constant-On-Time (COT) Converter
Mark Pearson
Hi Paolo
Or you can try the way described in this Application Report. Please refer Figure 4. Boot Capacitor Regulation in LM25007 Constant-On-Time (COT) Converter (Rev. A)
Regards,
Hi Dave,
"AN-2129 Boot Capacitor Regulation in LM25007 Constant-On-Time (COT)" (Figure 3) shows what this regulator might do in a situation like this. In the worse case, in no load, the VOUT is expected to behave like Figure 3 in the app note cycling…
Hi Stefan,
In Buck-Boost mode the abs max between the VIN and GND pin is (VIN+VOUT)=24+15=39V which is really close to the abs max 42V of the IC. It is possible to that there are spikes above 42V. The buck-boost circuit current flow is different than…
Hi,
I've attached the 2013 User's Guide for power products. Starting on page 53 you will find a selection of PWM controllers. many of these teh frequency can be varied according to external criteria.
As an example if you use a UC3842 it is a simple…
Gary,
Most any of our power controllers with dual output capability will provide the control. See attached document starting at page 50 with the dual output controllers on page 53 and 54 and choose what features you want.
Regards,
John
