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Hi,
I'd like to have 3 boards, with a 8-bit shift register on each,
and run the 3 line serial bit shifting line along the 3 boards.
I'd like each board to have 6 LEDs only, (not fully using the 8 bits).
Is there a way (hardware) to "jump" these 2 unused connections ?
can I connect the Q6 to...
Hi,
I am using a PIC (18F14K22@16MhzX4) to send a pulse of about 100uSec to a gate driver (FAN3214).
PIC has 0.1uF and 100uF bypass both ceramic SMD.
the gate driver is powered by 18-19v, also has 0.1uF and 100uF bypass both ceramic SMD.
The gate driver is powering an array of 10 IGBTs...
Thanks.
Is there any calculator you would recommend for ferrite core winding ?
I searched for very long, but none of the calculators are complex,
These who calculate number of turns and core size - ignore wire gauge and saturation current.
So i don't know which core i should be using.
If i...
Hi,
For a PFC boost converter, I need a 470uH at about 4A Isat., maybe a bit more.
these are quite hard to find.
can I use 4 pieces of 470uH 2A inductors in series parallel ?
2 in series will give 940uH, and then paralleled to another series couple, it will give 470uH again.
What about the...
OK,
But how do I make sure that the second stage buck converter will not empty the PFC capacitor ?
I have to prevent the PFC capacitor to discharge below ~320v so that the PFC won't be bypassed, right ?
Since the last stage output capacitor will be huge, (6000uF) relatively to the PFC...
So it is inevitable to use PFC and a buck converter as you suggested ?
In that case, can I use a relatively small PFC output capacitor, which will cause larger voltage ripple ,
and let the buck converter deal with the varying input voltage (I will restrict the PFC cap not to fall below 320v...
Oh I get it, since there is the "inrush diode" that initially charges the PFC capacitor directly from mains (bypassing the PFC circuit), that means that when i discharge this capacitor, all charge from 0 to 310v will be done by the NON-PFC path, while the remaining 310 to 380v will be charged...
I don't necessarily need PFC.
I just fount the idea of using a PFC controller to do that task.
It look perfect for this, since it is used to charge a DC bus capacitor to the voltage i need,
while allowing 110-220v input, and using the sine wave fully to charge, while a regular rectifier will...
I was asking how the UC3854 is better than the MCC33260 ?
why is it better for my application ?
If the feedback resistor voltage divider is setting the target output voltage, both chips use this method, so it should be achievable by both...
More opinions please
Why ?
I really like to low-parts count with the MC33260, while the 3854 need 3 times more supporting parts...
What is better with this one than the MCC33260 ?
Hello,
I am thinking of using a PFC boost-converter in order to charge big capacitors off mains power.
I have read that PFC converters are made for charging a DC-bus of 370 to 390 volts usually, with low accuracy (no voltage regulation)
In my application I need to charge big 360v capacitors...
Hi,
thanks, the spikes are the one i suspect. as i said the problem comes when the output voltage is above 500v mainly so it might be the limit that start generating really big spikes (?)
The datasheet doesnt show any snubber, although the datasheet of LT3751 (a similar part, identical...
The chip drives the gate to VCC-2v.
I tried both VCC of 12v, and VCC of 16v. - no change in heating.
the only thing which i am not sure about and comes into my mind is that the inductive spike caused by the transformer leakage inductance strikes on the Mosftet Vds. (like explained in the...
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