Hi CSC,
The COMP network is still absolutely necessary for operation.
You can use the DAC to dynamically adjust the output voltage.
See figure 8 and equation 4 in https://www.ti.com/lit/an/slyt777/slyt777.pdf
Also why are you using parallel inductors? …
Hi Quang,
This spec is quite similar to the LM5145 EVM (5V/20A/225kHz). Please send a completed quickstart calculator as well: www.ti.com/tool/lm5145design-calc
Regards,
Tim
Hi Bindu,
Take a look at the LM5145 75V controller and its quickstart calculator https://www.ti.com/tool/LM5145DESIGN-CALC .
This allows you to review MOSFET power losses based on the entered parameters. Note the LM5145 EVM is setup for 5V/20A/225kHz…
Hi James,
The specs in the thread title indicate that Vin-min is less than Vout, requiring a buck-boost controller such as the LM5176. For example, at 11V input with a 20V output setpoint, a buck will operate in dropout such that Vout is slightly below…
Hi Ashwini,
Please use PSPICE for TI for circuit simulation. Also, you can avail of the LM5145 quickstart calculator, which assists with component selection, bode plot review and efficiency estimation.
https://www.ti.com/tool/LM5145DESIGN-CALC
Regards…
Hello, please complete and send the LM5145 quickstart calculator for this design: https://www.ti.com/tool/LM5145DESIGN-CALC . The schematic looks okay, but you can use 60V FETs if Vinmax is 36V. Try CSD18563Q5A. Also, you can tie the NC pins to GND.
…
Hi Luke,
I recommend checking these designs with the LM5145 quickstart calculator: https://www.ti.com/tool/LM5145DESIGN-CALC
Power dissipation at no load or light loads is related to inductor core loss and/or MOSFET switching losses. Check the inductor…
Hello,
This is likely a measurement setup error at high frequencies.
Also, please ensure that the filter filter is adequately damped. If the issue persists, you can forward the schematic and a completed LM5145 quickstart calculator file for review:…
Hi
yes it is possible to modified, you can use below link to re-calculate the component value , and in final design, you may need two pair of mosfet with good thermal dissipation way to avoid the thermal issue.
https://www.ti.com/tool/LM5145DESIGN-CA…
Hi Ding,
Thanks for the question. You can use the LM5145 quickstart calculator file to check efficiency and power losses. With 30V or 40V NexFETs, > 95% should be achievable.
Note that if Vin-max < 42V, you can use the LM25145.
Regards,
Tim …
