lv8735v ON Semiconductor, lv8735v Datasheet - Page 24

• Manufacturer Part Number: lv8735v
• Description: Bi-cmos Lsi Pwm Constant-current Control Stepping Motor Driver
• Manufacturer: ON Semiconductor

Application Circuit Example
• Stepping motor driver circuit (DM = Low)
The formulae for setting the constants in the examples of the application circuits above are as follows :
Constant current (100%) setting
Chopping frequency setting
Timer latch time when the output is short-circuited
When VREF = 1.5V
Short-circuit state
detection monitor
Position detection
Logic input
monitor
Clock input
I OUT = VREF/5/RF resistance
Fchop = Ichop/ (Cchop × Vtchop × 2)
Tcem = Ccem × Vtcem/Icem
100pF
200pF
-
+
= 1.5V/5/0.47Ω = 10.64A
= 10μA/ (200pF × 0.5V × 2) = 50kHz
= 100pF × 1V/10μA = 10μs
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1
2
3
4
5
6
7
8
9
VG
VM
CP2
CP1
VREG5
ATT2
ATT1
EMO
CEM
EMM
CHOP
MONI
RST/BLK
STEP/DC22
FR/DC21
MD2/DC12
MD1/DC11
DM
OE/CMK
ST
VREF
GND
LV8735V
OUT1A
OUT1A
OUT1B
OUT1B
OUT2A
OUT2A
OUT2B
OUT2B
PGND
PGND
VM1
VM1
VM2
VM2
RF1
RF1
RF2
RF2
NC
NC
NC
NC
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