Epson LQ 1050 Technical Manual - Page 63
Pulse-Width Modulation
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REV.-A 2.3.2.5 Pulse-Width Modulation (PWM) Circuit Figure 2-16 shows the internal circuit of the NJM2355 IC. The PWM comparator operates as follows: In circuit 1 the output from AMP 1 flows into the negative terminal of comparator 1, and the outputs from AMP 2 and AMP 3 in circuit 2 flow into the negative terminal of PWM comparator 2 without wired OR. Dead-time control voltage is also input to additional negative terminals of both PWM comparators 1 and 2. A sawtooth waveform from the oscillator is input to the positive terminals. The sawtooth waveform from the oscillator causes the comparators to generate pulses as shown in Figure 2-17. r C- i-rc- u- i-t - 1 1 i II I I PWM Comparator 1 I I I h- -t - - - - - - - - - - - - - - - - - - I t - - - - +- 1%12 Osc 3 1% -1 J r C-i-rc- u- -it- -2 J - - -1 - - PWM Comparator 2 I I I II I L i Figure 2-16, NJM2355 Internal Circuit 2-19 ,,