Tool/software: WEBENCH® Design Tools
Hi all,
For a power supply solution, our customer like to have power modules used in the design. As the featured THT ones from the customer are not feasible for this particular design, your website recommended the LMZ31710 instead.
Now we have to use the synchronization fefature for the output voltages of 5V, 3.3V and 1.5V, each from one of the LMZ31710.
Unfortunately, there is some information missing in the datasheet, as well as options in the WEBench tools.
The input on all three will be: Vin = 12V ±5%
Output 1 will be Vout1 @2.5A = 5V
Output 2 will be Vout2 @2.5A = 3.3V
Output 3 will be Vout3 @3.5A = 1.5V
That said, the datasheet values will not allow to run the LMZ31710 with the same switching frequency on all three output voltages, as well as the WEBench tools.
But my calculation stated, that a minimum on-time of 210ns is within a safe operating area. From this, I calculated a worst case switching frequency and added some headroom.
With this, I landed on a switching frequency of 530 kHz, which results in an estimated R_rt = 165kOhm.
So, my question is, will this work as intended and will WEBench support using custom switching frequency on the LMZ31710 model?
The goal is to see the calculated operating parameters like peak efficiency, output ripple voltage, load step response, control loop bandwidth and all the values presented if I 'am using a regular (discrete) solution from TI.
BR
Frank