KA8329B 데이터 시트보기 (PDF) - Fairchild Semiconductor

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KA8329B

3-PHASE CAPSTAN MOTOR DRIVER

Fairchild Semiconductor 

VCR PRODUCTS

KA8329B

3. MOTOR SPEED CONTROL (INPUT CURRENT LIMITATION)

The maximum output current is limitted by pin 19 voltage as follows. So a motor speed is controlled by the output

current. In case of no-use, it is to be short-circuit with VCC1.

GML = ∆IO / ∆VLIM = (IO2 − IO1) / (VLIM2 − VLIM1), where VLIM1 = 1.45V → Output current=IO1

VLIM2 = 1.55V → Output current=IO2

Output

Current

(Max.)

19

0.67A/V

0 1.25V

VLIM (Pin19)

4. MOTOR SPEED CONTROL (INPUT VOLTAGE CONTROL)

The control of motor speed is possible on the conditions of VCTL (Pin20) ≥ VREF.

The control gain is approx. 1.0A/V as follows.

GML = ∆IO / ∆VCTL = (IO2 − IO1) / (VCTL2 − VCTL1), where VREF = 2.5V, VCTL1 = 2.6V → Output current=IO1

VREF = 2.5V, VCTL2 = 2.7V → Output current=IO2

VCC1

20

Output

Current

(Max.)

1.0A/V

GOUT

0

VREF

VLIM (Pin20)

MIC-99D001

9

January 1999

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