Uc3842 Application Circuit Diagram. Don t worry i will write a complete article on uc3842 pwm controller in coming days. Output short circuit current isc 30 85 180 30 85 180 ma oscillator section frequency tj 25 c ta tlow to thigh fosc 47 46 52 57 60 47 46 52 57 60 khz frequency change with voltage vcc 12 v to 25 v fosc v 0 2 1 0 0 2 1 0 frequency change with temperature ta tlow to thigh fosc t 5 0.
Output short circuit current isc 30 85 180 30 85 180 ma oscillator section frequency tj 25 c ta tlow to thigh fosc 47 46 52 57 60 47 46 52 57 60 khz frequency change with voltage vcc 12 v to 25 v fosc v 0 2 1 0 0 2 1 0 frequency change with temperature ta tlow to thigh fosc t 5 0. You don t have a knowledge about pwm controller ics. Don t worry i will write a complete article on uc3842 pwm controller in coming days.
The 6v hysteresis prevents vcc oscillations during power sequencing.
Pin numbers in parentheses refer to the d package. Applications off line switched mode power supplies dc to dc converters uc3842 block diagram note. The 6v hysteresis prevents vcc oscillations during power sequencing. Figure 5 shows that the uvlo turn on and turn off thresholds are fixed internally at 16v and 10v re spectively.
