Hi,
We do have some quick start calculator that you can download and you can compared your design with the calculator
www.ti.com/.../lm5116-5116wg-25116design-calc
Thanks
-Arief
Suggest using the LM5116 Quick start calculator. Need to watch for The losses in the FET as well as the Current capability of the VCC regulator if you do not intend to use an external VCC bias supply?
See link below to QS calc.
www.ti.com/.../lm5116…
Hi Jose,
Not sure exactly why both FETs are updated together in WEBENCH - it may be related to power loss optimization.
In any event, take a look at the LM5146 100V controller and its quickstart calculator (as it allows entry of MOSFET parameters for…
Hi Saleem
No issue from the device point of view. In general, 480W design requires good thermal design to dissipate power loss and optimized layout to minimize switching noise. Please refer the quick start at www.ti.com/.../lm5116-5116wg-25116design-…
Hi
Please refer my comments below.
-Place C_vin as close to the IC
-Populate C_uvlo if you wnat a hiccup operation.
-Please ground VCCX pin if it is not used.
-Reserve foot prints for RC snubber at SW node.
-Reserve a foot print for a gate resistor…
Hi Manu,
Looking at the schematic, R6 should be a fixed value resistor and set R9 as the feedback variable resistor. Also try to change Pin 17 (VCCX) connection by connecting it to ground. The inductor value looked to be oversized(2mH). You may want to run a WEBENCH…
Eric is correct to caution you about the 100V input rating for the LM5116 buck controller.
If you can reduce the maximum Vin a little, filter the Vin pin and snub the SW pin to limit the spike voltages, the LM5116 could cover the 2nd of the two converter…
Hello,
The answer to this question is:
The Rramp goes to VCC in the calc tool on line for the LM5116 and goes to Vsw for the LM5117 & this is the correct configuration.
Best regards, Keith
David, when I pressed "reply" button previously (question referred to the possibility that math estimate is not even possible), then I saw your post with link to calculating efficiency that makes my previous question irrelevant. Calculations provided…
Part Number: LM5145 Other Parts Discussed in Thread: CSD18563Q5A , LM5116 , CSD18531Q5A , LM5146-Q1 For a new project for a customer we want to make a design where we need 3* +24V/15A and 1* +24V /6A out of incoming 230Vac per unit (each machine will contain…