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KA3021DTF Arkusz danych(PDF) 9 Page - Fairchild Semiconductor |
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KA3021DTF Arkusz danych(HTML) 9 Page - Fairchild Semiconductor |
9 / 12 page KA3021D 9 3. FOCUS, TRACKING ACTUATOR, SLED MOTOR DRIVE PART • The reference voltage REF is given externally through pin 23. • The input signal,pin3,20.25 is amplified by R2 / R1 times and then fed to the level shift circuit. • The level shift circuit produces the differential output voltages and drives the two output power amplifiers. Since the differential gain of the output amplifiers is equal to 2 × (1+ R4 / R3), input signal is amplified by (R2 / R1) × 2 × (1 + R4 / R3). • If the total gain is insufficient, the external resistors can be used through pin 4, 24 to increase the gain. • The bias voltage (Vref) is about a half of the supply voltage(VM). 4. TRAY MOTOR DRIVE PART − M 23 4 3 Vref R1 AP1 R2 + − LEVEL SHIFT R3 Vr R3 AP2 AP3 R4 R4 Power amp 20 25 24 M 12 13 19 16 15 DO2+ DO2 − D LEVEL SHIFT M.S.C S.W D CTL IN FWD REV IN |
Podobny numer części - KA3021DTF |
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Podobny opis - KA3021DTF |
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