Hi Navneet,
1, The threshold for PKLMT is 0.0 V. Connect this input to the negative voltage on the current sense resistor. Use a resistor to REF to offset the negative current sense signal up to GND. However, In your circuit, PKLMT is connected to GND…
Hello,
You have a low frequency instability in your power supply. You should re-calculate the compensation network component values in the feed back circuit. The first sample shows an instability at 0.3Hz and the second is unstable at 0.6Hz. When your power…
Other Parts Discussed in Thread: UC3854A , UC3854B , UC2854A Reference spec page 2 And spec page 8 :
Q: Why setting 250uA Limit for AC high line ?
If over 250uA can influence which function ?
Which tolerance for this 250uA test plan in TI mass product…
Hello,
I am answering my own question. I am using UC3854B and the voltage feedback reference is changed with UC3854A&B versions. It's not 7.5V its 3V. So my Rvi and Rvd is wrong. I changed my Rvd to 4K7 and now its working.
Now, should I use…
TI released a brand new PFC controller UCC28180, which is functionally simlar to UC3854B, but it has a lower pin-count, it reduces system BoM cost, it helps to reduce shunt power resistor power dissipation and it features programmable switching frequency…
Other Parts Discussed in Thread: UC3854B , UCC28070 , UCC28051 Hello,
I have an application where I need an ultrawide range pfc at about 10W (not a typical application).
We have experience using uc3854b, ucc385xx, ucc28070 over typical wide range input…
