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KA3030DTF Datasheet(PDF) 10 Page - Fairchild Semiconductor

Part # KA3030DTF
Description  6-Channel Motor Drive IC
Download  17 Pages
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Manufacturer  FAIRCHILD [Fairchild Semiconductor]
Direct Link  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

KA3030DTF Datasheet(HTML) 10 Page - Fairchild Semiconductor

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KA3030D
10
4. FOCUS, TRACKING, SPINDLE, SLED DRIVE CIRCUITS
GV = 20log (VO/VIN) = GV1 + GV2 = 3.5dB + 6dB = 9.5dB
Vref is fixed to 2.5V as the external bias voltage and the input signal through the VIN is amplified to about 9.5dB through two
state AMP.
In the level shift circuitry, the input signal is transformed into the current so that the voltage V1 and V2 are shifted to V1’ and
V2’ respectively.
V1’ = V1 + (IC × VREF) = V1 + ∆V
V2’ = V2
− (IC × VREF) = V2 − ∆V
Because V1 and V2 voltages, in their initial state, are equal, the voltage, VM, on the sides of the motor is following VM = V1’
− V2’ = ∆V − (−)∆V = 2∆V
Rotation occurs due to 2
∆V voltage difference at both sides of the motor.
+
+
M
+
V1’
GV2
V2’
V2
V1
Rref
IC
VREF
+
GV1
VREF
(pin 23)
VIN
LEVEL SHIFTER


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