Part Number: LM5155EVM-SEPIC Other Parts Discussed in Thread: LM5155 , Tool/software: The same ringing issue mentioned in a previous post was observed in our LM5155 SEPIC design. We installed a snubber network in parallel with the output diode as described…
Part Number: LM5155EVM-SEPIC As we can see on the user's guide. The switching frequency is 2.2MHz,
In the datasheet, the frequency can be 100kHz or 2.2MHz.
I want to know why does EVM choose this 2.2MHz? Is there any benefit or limitation of EVM…
Part Number: LM5155EVM-SEPIC Other Parts Discussed in Thread: LM5155 , , LM5156 Hello guys,
One of my customers is evaluating LM5155 using LM5155EVM-SEPIC.
But they knew recently that it is difficult to get LM5155 by their mass-production start dead line…
Part Number: LM5155EVM-SEPIC
Hi,
Is it possible to run LM5155QDSSRQ1 (no hiccup) in constant output current mode? Will the output current will be limited and stable with no resets when the load is high?
I would like to select different output current…
Part Number: LM5155EVM-SEPIC Other Parts Discussed in Thread: LM5155 Hi,
I've loaded the LM5155EVM-SEPIC with 10 ohm load. Vin 17v. Switching frequency 2.14MHz
I'm observing very large ringing on:
Output diode's anode
FET's drain
…
Part Number: LM5155 Other Parts Discussed in Thread: , LM5176 Hi
I have modified a LM5155EVM-SEPIC evaluation module to 5V output voltage by changing R9 (Rfbt) to 18.7 kOhm and that works just fine with up to 2A output current with an input voltage between…
Hi Jass,
The SEPIC topology is not specifically listed in the control scheme, but I would assume a CMC Flyback would be the most accurate replacement. (I will need to check this with a compensation expert) For alternative calculation guides, we have an…
Hi Prit,
The layout has many issues. You should follow LM5155EVM-SEPIC .
You should select SMD diode and MOSFET for best performance.
Best Regards,
Feng Ji
Hi Lin,
Thanks for using the e2e forum. Are you referring to the LM5156 quickstart calculator tool in SEPIC topology? For a SEPIC design, it is both possible to use a coupled or uncoupled inductor. The calculator sheet uses a coupled inductor design. You…
Hi Ishan,
I am glad to hear you are making progress with your design.
- Yes, I can AGND and PGND should be connected through a small trace or nettie. If there is no connection, the two ground levels can shift apart, which can result in instability or…
