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3977 Datasheet(PDF) 13 Page - Allegro MicroSystems

Part # 3977
Description  MICROSTEPPING DMOS DRIVER WITH TRANSLATOR
PDF  18 Pages
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Manufacturer  ALLEGRO [Allegro MicroSystems]
Direct Link  http://www.allegromicro.com
Logo ALLEGRO - Allegro MicroSystems

3977 Datasheet(HTML) 13 Page - Allegro MicroSystems

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3977
MICROSTEPPING DMOS DRIVER
WITH TRANSLATOR
www.allegromicro.com
13
Dwg. WK-004-13
PHASE 1
CURRENT
PHASE 2
CURRENT
SLOW
DECAY
MIXED
DECAY
SLOW
DECAY
MIXED
DECAY
STEP
INPUT
HOME
OUTPUT
100%
–100%
100%
–100%
SLOW
DECAY
MIXED
DECAY
SLOW
DECAY
MIXED
DECAY
38.3%
70.7%
–70.7%
70.7%
–70.7%
–38.3%
38.3%
–38.3%
Quarter-Step Operation
MS1 = L, MS2 = H, DIR = H
The mixed-decay mode is controlled by the percent fast
decay voltage (VPFD). If the voltage at the PFD input is
greater than 0.6VDD then slow-decay mode is selected. If
the voltage on the PFD input is less than 0.21VDD then
fast-decay mode is selected. Mixed decay is between
these two levels.



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