UC1845A-SP: Error Amplifier

Hey Rolf,

The block diagram showing 2.5 V near the error amplifier is implying that to be an output or an input.
Its biased to 5 V.

Thanks,
Daniel

Hi Daniel. 

Thank you for the answer, but somehow it does not make sense to me....Or we misunderstood each other

Here the reference is 2.5V and in Figuer.17 it is 5V

Which Voltage level do I need set for my Feedback circuit?

Hi Daniel

Guess I found another mistake in the Datasheet

The Y-axis (vertiacal) of Figure 20 and 21 should be swapped. Do you agree?

BG

Rolf

And how would be the duty cycle vs timing resistance range using UC1845A? for example: Would a 2k resistor correspond to a max duty of 80/2 = 40%?

Best regards Rolf

Hey Rolf,

I do not agree they should be swapped.
They seem correct to me the way they are.

Thanks,
Daniel

Hey Rolf,

You will have to divide by 2 here correct.

Thanks,
Daniel

Hey Daniel 

What if I show it like this? Left side (Fig. 20) should be a frequency on the Y-Axis not a Duty Cycle! And In Figure 21 a Duty Cycle instead of a Frequency.

What is about my assumption 2k = 40% Duty?

Best Regards

Rolf