Uc3842 Power Supply Circuit Diagram. Likes 1 dislikes 1 reply. Uc3842 ic can be easily found in most of the electronic equipment switching power supply.
Figure 5a shows that the uvlo turn on and turn off thresholds are fixed internally at 16 v and 10 v respectively. This circuit insures that v cc is adequate to make the uc3842 fully operational before enabling the output stage. Feedback to control voltage is taken from the auxiliary winding.
Fig 11 schematic diagram of low power short circuit protection circuit when the output circuit is shorted the output voltage disappears the optocoupler ot1 does not turn on the voltage of pin 1 of uc3842 rises to about 5v and the partial voltages of r1 and r2 exceed the tl431 reference making it conductive the vcc potential of pin 7 of.
U 100a uc3842 3 4 5 provides low cost current mode. Likes 1 dislikes 1 reply. I created this switching power supply for analogue semiconductor oscilloscope. Principle of input circuit and common circuit.
