SCY99194 Datasheet, PDF (26/40 Pages) ON Semiconductor – Fixed Frequency Current Mode Controller

SCY99194
Figure 51. Start−up, Shutdown and AC Line Unplug Time Diagram
Oscillator with Maximum On Time and Frequency
Jittering
The SCY99194 includes an oscillator that sets the
switching frequency 65 kHz. The maximum duty cycle is
80%. In order to improve the EMI signature, the switching
frequency jitters ±6 % around its nominal value, with a
triangle−wave shape and at a frequency of 125 Hz. This
frequency jittering is active even when the frequency is
decreased to improve the efficiency in light load condition.
Figure 52. Frequency Modulation of the Maximum
Switching Frequency
http://onsemi.com
26