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KA3021DTF Arkusz danych(PDF) 9 Page - Fairchild Semiconductor

Numer części KA3021DTF
Szczegółowy opis  4-Channel Motor Driver
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Producent  FAIRCHILD [Fairchild Semiconductor]
Strona internetowa  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

KA3021DTF Arkusz danych(HTML) 9 Page - Fairchild Semiconductor

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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


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