FAN8705 데이터 시트보기 (PDF) - Fairchild Semiconductor

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FAN8705

5 Channel DSC Motor Driver

Fairchild Semiconductor 

5. Power Saving

The typical timing chart to get 1 frame of still image or motion pictures for shutter operation is shown following fig. If shutter is fully

opened within some time interval(to1) depending on shutter motor and mechanism, then we don’t need to operate shutter motor to be

opened more in ’WEAK OPEN’(to2). In other words we simply maintain the shutter open. The method to maintain this is to reduce

shutter current by control GAIN3 input. So, battery power can be saved. and ’WEAK CLOSE’ is the same.

To : High speed shutter motor : 1/5000s

Bulb shutter : > 1sec

tc1

tc2

Shutter motor

IDLE

OPEN

OPEN

to1

WEAK

OPEN

to2

CLOSE

20ms

0 ~ OO

WEAK

CLOSE

OPEN

20ms

Total Open

IDLE

OPEN

Total Close

Shutter

Speed

t0

t1

t2

Effective

Exposure

time

t3

t4

t5

Image Data Storing Start

IN9

IN10

GAIN3

Ishutter

To1

To2

T1

T2

20

www.fairchildsemi.com

FAN8705 Rev. 1.0.1

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