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KA3030DTF 数据表(PDF) 10 Page - Fairchild Semiconductor |
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KA3030DTF 数据表(HTML) 10 Page - Fairchild Semiconductor |
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10 / 17 page  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 |
类似零件编号 - KA3030DTF |
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类似说明 - KA3030DTF |
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