Looking for a small simple solution to create a synchronous buck converter to drive a high current LED and
have the capability to have PWM dimming. Looks like the LM5033 has a soft start pin that controls the output
FETs like a PWM dim input would. Can I configure the LM5033 as a simple two FET buck converter??
Don't know why my post was moved to isolated controllers?? I do not want an isolated
sychronous buck converter. I want a non isolated buck converter..
I'm not sure about the movement of the post from one folder to another, but I have forwarded your question to one of the apps engineers that knows this part.
Joseph Wu
Did you also consider other devices like the LM3424 or integrated solutions like TPS92550?
Jeff,
Yes you could configure the LM5033 as a sync buck. I have never done that, but let me know how it works. Have you looked at the LM5015, or the LM20323, these are both synchronous buck controllers.
Terry
Terry,
Thanks for the reply. Was off all last week and just getting back.
The other requirement that I should have mentioned is that I also have to have a PWM version of the LED powersupply.The Vf will be 6.5 for one and 9.75 volts for another. And the current is in the 5A range.
Looking at the way the enable pin is configured I don't think I can use this at the 20KHz dim rate I am looking for. I noticed one of the ICs also opens the loop filter with the dim signal. Have been trying to avoid the shunt method of dimming. But maybe that is the route I have to go. I like the LM3433 except for the negative supply configuration. I have to run from a +28 Volt DC supply.
Thanks,
Jeff
Sorry I'm not familiar with the LM3433, that's another group.