A3082B 데이터 시트보기 (PDF) - Fairchild Semiconductor

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A3082B

Bi-Directional DC Motor Driver

Fairchild Semiconductor 

KA3082

3. Logic Switch Circuit

5

SVCC

V1

V2

6

Q4

Q7

Q6

Q5

VCTL

4

7.4V

This circuit define reference voltage of output.

When pin #5 is “H” and pin #6 is “L”,

- V1 = VZD + VBEQ4 + VBEQ5 ·=· 8.9V

- V2 = VBEQ 7 + VSATQ6 ·=· 0.87V

V1 and V2 are related with the output voltage of the motor and change according to the voltage of pin #4 (VCTL).

4. Drive Output Circuit

V1

Q1

PVCC

V2

Q4

Q2

Q5

R1

VO1

RL

R2

M

VO2

Q3

Q6

V1 = 8.9V

V2 = 0.87V

VO1 = V1 - VBEQ1 - VBEQ2

VO2 = VQ6SAT

VO = VO1 - VO2

= V1 - VBEQ1 - VBEQ2 - VQ6SAT

IRL = (VO1 - VO2) / RL

8

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