Part Number: UC3827-1 Dear sirs.
I am working with the UC3827-1 controller, for a high voltage psu.
In the breadboard stage, I have found that the output signal of the Buck stage, pin 2, has a minimum duty cycle of around 6-7%, and a max. duty cycle…
I appreciate that you are digging into the subject Chuck..
I just checked the layout. The UC3827 pin 4 goes direct to the cap, 0.47uF ceramic, which goes direct to ground. I am using a 2 layer board, but I was careful to lay in a very solid ground system…
Hi Derek,
The voltage on the RT pin is regulated at 2V and an external resistor is connected between the RT and Ground to programme a current which sets the internal oscillator frequency. The formula for the oscillator frequency is on page 12 of the datasheet…