FAN8705 데이터 시트보기 (PDF) - Fairchild Semiconductor

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FAN8705

5 Channel DSC Motor Driver

Fairchild Semiconductor 

4. Channel 5

Channel 5 is constant current driver. motor current is determined by ADJ3 voltage VADJ3, sensing resistance RSENSE and GAIN3

input and calculated by the following equation.

when, GAIN3 = Low

when, GAIN3 = High

IMOTOR

=

---------V-----A---D----J---3---------

RSense + RW

IMOTOR

=

-V----A----D---J---3----×-----1-----⁄--3--

RSense + RW

where, RW is internal bonding resistance and metal resistance is around 0.05Ω

IN9,10

Vref

7R

ADJ3

VADJ3

L

RADJ3

2R

H

R

FC1 FC2

GAIN3

VM4

Constant

current

H-bridge

CH5

OUT9

OUT10

RW

RS

RSense

Shutter

If oscillation or overshoot will be appeared in the output terminals, add external capacitors at FC1 and FC2 terminals. The output

response time depend on the FC1/FC2 capacitance and interval of input signal.

18

www.fairchildsemi.com

FAN8705 Rev. 1.0.1

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