Query on designing an flyback for automotive application
Posted by: gowthamkrishna
on
I tried to design 60W 15V flyback converter using the solutions provided by your esteemed company. With a design constraints of input voltage variation from 250VDC to 550VDC and 60W, 15V output I found INN3949CQ in similar range. It would be great if you can kindly provide some insights on the performance of the converter at 250VDC as input.
In the sample design documents available in the website, I found that no information is provided for the input voltage in the range of 250VDC (300-1000VDC is specified as well as 200VDC is specified). I would like to know more about the efficiency at 250VDC as input.
Files
| Attachment | Size |
|---|---|
| No information of power output or efficiency in 250VDC input is specified. | 61.07 KB |
Hi gowthamkrishna,
We are currently doing some internal test for a 86 W / 13.5 V flyback operating from 300 - 900 Vin.
Your requirement of 250 Vin is somehow pretty close to 300 Vin and you can approximate the efficiency to be somewhere near 300 Vin curve.
Based from the attached curves, efficiency for 86 W at 300 Vin is somewhere ~ 94% (Figure 21 and Figure 22).
This design is also capable to deliver 86 W at 200 Vin at high ambient temperature (Figure 98).
For your 60 W design (depending on your component selection and transformer design), you can easily reach this level of efficiencies as well.