The current feedback ISENSE is connected to the 8 pin of UC3842 through a 10k resistor. What is the purpose?
Grey Posted on November 17, 2020
It must be good, I guess it is current compensation.
Zora Posted on November 17, 2020
Raise the potential of pin 3 to reduce the resistance of CS resistance and reduce loss.
In addition, it is best not to use words like -24V for the negative pole above.
It is easy to misunderstand that there is a negative voltage.
It can be written as: GND or 24V-.
Nada Posted on November 17, 2020
R9 and R5 divide the reference voltage Vref to obtain a control level to raise the IS signal level.
The advantage is: You can use a smaller R11 to adjust the current, thereby improving efficiency.
The disadvantage is that the current adjustment accuracy deteriorates and the risk of loss of control increases.
