Epson LQ 1050 Technical Manual - Page 65
REV.-A
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REV.-A 2.3.2.6 +5V Regulator Circuit Figure 2-18 shows the +5 VDC regulator circuit An NJ M2355 switching regulator IC is used for constant-frequency pulse-width modulation. The circuit shown below employs an NJ M2355 configured as a chopper-style switching regulator circuit. This IC has a built-in oscillator. The oscillation frequency is determined by external components connected to pins 2 and 3. Therefore, R22, and C9 cause the circuit to oscillate at about 30 kHz. The oscillator waveform is shown in Figure 2-19. +o I NJM 2355 (7A) C3746 0 1 3 012 () A1015 :?; 9 R 13 D3 2.IWw 03 L2 - - +5#v Cll t 1000U' 10V lo5t : R14 - 3. 3K ':" 1 - R 19 33K () VA1$ - c 12 N I o. IM +N C7 o 4 _ GND Figure 2-18. +5V Regulator Circuit 20ys/ DI V Figure 2-19. Oscillator Waveform 2-21 ,.