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BA6392FP Datasheet(PDF) 5 Page - Rohm |
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BA6392FP Datasheet(HTML) 5 Page - Rohm |
5 / 8 page 328 Optical disc ICs BA6392FP FInput / output circuits FCircuit operation (1) Fig. 3 shows the inputs from the digital servo IC for CH1-CH3 drivers (all drivers except the spindle). SW1 is on when the forward input signal (HIGH level, over 2.4V) is present. SW2 is on when the reverse input signal is present (Fig. 2) The constant current (I1) at this time enters the RC and generates an integral waveform based on the duty of the input waveform. The BTL is output from BUF1 and BUF2 (Fig. 4). To maintain the HIGH level with forward (or reverse) in- put, the DC voltage generated at point A is : I1 R 2.5V (reverse : *2.5V) This is the voltage generated relative VREF. The setting is such that a voltage differential of 5V is generated be- tween output pins. The time constant is : R C = 2.4 µsec |
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