FAN8705 데이터 시트보기 (PDF) - Fairchild Semiconductor

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FAN8705

5 Channel DSC Motor Driver

Fairchild Semiconductor 

2. Channel 3

CH3 is constant voltage driver. The output voltage can be calculated by following equations.

When, Gain2 = low,.

VMOTOR = VADJ2 × 4.9 – VDSON ≈ VADJ2 × 4.9= 3.6V

when, Gain2 = high

VMOTOR

=

VADJ2

×

1--

3

×

4.9

–

VDSON

≈

VADJ2

×

1--

3

×

4.9=

1.2V

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. VADJ2 is about 0.75V typically as following equation. can be adjusted by installing external resister RADJ2.Calculated

VMOTOR should be less than power supply voltege VM2 for operating constant voltage mode.

VADJ2=

3--

4

×

Vref

IN5,6

ADJ2

VADJ2

RADJ2

Vref

R

L

2R

H

R

4.9X

VM2

Constant

Voltage

H-bridge

CH3

GAIN2

3. Channel 4

Channel 4 is operated by saturated H-bridge mode.

PGND2

OUT5

Iris

OUT6

VM3

IN7

OUT7

IN8

Saturated

H-Bridge

CH4

DC

M

OUT8

PGND2

17

www.fairchildsemi.com

FAN8705 Rev. 1.0.1

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