FAN8705 데이터 시트보기 (PDF) - Fairchild Semiconductor

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FAN8705

5 Channel DSC Motor Driver

Fairchild Semiconductor 

Application Information

1. Channel 1 and Channel 2

CH1 and CH2 are constant voltage driver. The output voltage can be calculated by following equations.

when, Gain1 = low,.

VMOTOR = VADJ1 × 4.9 – VDSON ≈ VADJ1 × 4.9= 3.6V

when, Gain1 = high

VMOTOR

=

VADJ1

×

2--

3

×

4.9

–

VDSON

≈

VADJ1

×

2--

3

×

4.9=

2.4V

where, VMOTOR is motor driving voltage. VDSON is drain-source voltage of output lower MOSFET in on time, It’s less than

0.1V@300mA. VADJ1 is about 0.75V typically as following equation. It can be adjusted by installing external resister RADJ1.Calcu-

lated VMOTOR should be less than power supply voltege VM1 for operating constant voltage mode.

VADJ1=

3--

4

×

Vref

IN1,2

IN3,4

ADJ1

VADJ1

RADJ1

Vref

R

L

R

H

2R

4.9X

VM1

Constant

Voltage

H-bridge

CH1,2

OUT1,3

OUT2,4

GAIN1

PGND1

12

www.fairchildsemi.com

FAN8705 Rev. 1.0.1

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