FP5452

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Rev. 1.0

15/21

Oscillator / PWM Comparator

The oscillator frequency can be adjusted from 20KHz to 500KHz by the resistor (RT) and

capacitor (CT) that are connected to pin1 and pin2 respectively. A sawtooth waveform would be

compared with the error amplifier output signal and duty control voltage. Figure 20 shows the

relationship of oscillator, error amplifier and PWM comparator. Figure 21 is their waveforms.

Figure 20 Oscillator / PWM Comparator with Frequency RC Circuits

Figure 21 FP5452 Timing Waveforms