For the input capacitor, it is possible to use a ceramic bypass capacitor. In fact I always use ceramic input capacitors with my designs (not necessarily LM2674). You just need to be careful about the possible ringing on the input if your connection to…
Part Number: LM2674 I am trying to find out if the LM2674-5.0 has a minimum load requirement to maintain regulation. The spec sheet shows the output voltage for: V IN = 8 V to 40 V, I LOAD = 20 mA to 500 mA, which seems to imply a minimum load of 20 mA…
Other Parts Discussed in Thread: LM2674 We have been using the LM2674 in a standard application where feed voltage (+VP) is 24VDC and output (+12V) is 12VDC at 300mA. See included schematic. We are looking at using the same circuit board but in an application…
Other Parts Discussed in Thread: LM2674 Hi
I have made the power supply design of 12 V for the below requirement using IC LM2674. Please let know the inductor selection and capacitor selection are effective design. I can see the difference in wbench…
Part Number: LM2674 Tool/software: WEBENCH® Design Tools I am using the LM2674 switching regulator to step a Vin of 24 to 33V down to 3.3V at a maximum load current of .5A. When I use the instructions on the datasheet page 13 to find L1, I go to Figure…
Yes! The smaller die can affect this value and make it larger than it should be. If you have tolerance to play with, I would suggest using the worse of the two values.
Thanks,
Anston
Juan,
I talked to Webench team and understand why there is a difference between the ds and calcuation.
In Webench calculation, the target inductance is picked such that the peak-2-peak inductor current ripple is 30% of the maximum DC load current…
hi,
I used LM2674M-3.3/NOPB in my system. As I know LM2674M-3.3 is not available from TI's website. But from the open market(such as Avnet) it's still available. I got some sample,it marked as MCAB 2674M3.3. How can I distinguish whether it's compliance…
I had a problem after building the circuit following the datasheet. The LM2674-5V is use of powering the arduino to drive some sensors and the LM2678-ADJ is the charge a Lipo 11.1V with a solar panel. Aside from the application now is in testing the circuit…
Hi Joerg,
Based on the output current change you mentioned, you can calculate the change in input current based on your input to output voltage ratio. An input cap value, that is big enough to stabilize the input voltage while supplying the current…
