Part Number: UC2842A The schematic diagram is as follows.
Design requirement: Input 85-265VAC and output 12V 2A.
Currently, during testing, it was found that the output load adjustment rate is relatively poor, and the output decreases at 240mA. Could…
Part Number: UC2842A Other Parts Discussed in Thread: UC2844A Customer fund that the duty cycle would be unstable at quite light load and certain input condition. However, when C303 is added between Pin3 and Pin4, the problem is gone. We'd like to know…
Part Number: UC2842A Hi Team,
How to adjust the output current by MCU? Use ADC to adjust Vref voltage? Is there a production EVM available for testing?
Part Number: UC2842A Other Parts Discussed in Thread: UC2842 Hello, I've designed a flyback converter with UC2842 IC. Design is based on TI's tool and reference schematics and there is a problem, The AC Board's fuse keeps burning up. When I disable the…
Part Number: UC2842A Other Parts Discussed in Thread: TL431 Hi,
I understood the working of the Flyback circuit from the block diagram attached in this mail.
The driver circuit for the Power Mosfet is UC2842A. I understood that this is a PWM controller…
Part Number: UC2842A Hi,
I have read datasheet of UC2842A and application circuit ( calculation ).
Questions :
1. Snubber Circuit ( RCD snubber selection ) Calculation not specified ? Please give the calculation details.
2. Is there any Simulation…
Part Number: UC2842 Hi I have attached two images for more reference.
1.What is the voltage range? ( marked as yellow colour )
2. Explain the Auxiliary Transformer working ? Why it is needed ? ( Marked in red colour )
3. Explain the optoisolator…
Part Number: UC2842 Hi,
I have read datasheet of UC2842A and application circuit ( calculation ).
Questions :
1. Snubber Circuit ( RCD snubber selection ) Calculation not specified ? Please give the calculation details.
2. Is there any Simulation…
Hi Brain,
You can use a diode, a CCCS and a capacitor to establish opto-coupler model. Attached for your reference. thank you. Optocoupler_H11A817A.TSC
Part Number: UC2842A Hi Team,
My customer would like to know what is the min. VCC voltage that can keep VREF stay at 5V output?
Thanks a lot.
Vincent Chen
