LV8711T Datasheet, PDF (11/12 Pages) Sanyo Semicon Device – PWM Constant-Current Control Stepping Motor Driver

Application Circuit Example
LV8711T
1 VM
2 _NC
3 REG5
Logic input
4 _PS
Abnomal condition sensing monitor
5 _EMO
It is a pull-up resistor for
Abnomal condition
sensing monitor.
The setting range is
10k‰ to 100k‰
6 VREF
The REG1 voltage (1V) can be
used to set output current.
It can connect to VREF directly
or after divided with resistors.
The setting range (total) is
10k‰ to 100k‰
Please refer to P.7 for details.
7 REG1
8 ATT1
9 ATT2
It sets the PWM frequency.
The setting range is
100pF to 500pF
Please refer to P.8 for details.
220pF
10 CHOP
11 VCC
12 GND
IN1A 24
IN1B 23
OUT1A ²²
RNF1 21
OUT1B 20
VMM 19
OUT2A 18
RNF2 17
OUT2B 16
PGND ¹⁵
IN2A 14
IN2B 13
Logic input
It is a resistor to detect output
current
The setting range is
0.1‰ to 1‰
Please refer to P.7 for details.
M
Logic input
Each constant setting method for the above circuit diagram example is as follows :
Current LIMIT (100%) set
VREF = 1.0V (when internal regulator output is connected)
ILIMIT = VREF / 5 / RNF resistance
= 1.0V / 5 / 0.47Ω = 425mA
Chopping frequency setting
Fchop = Ichop / (Cchop × Vt × 2)
= 10μA/ (220pF × 0.5V × 2) = 45 kHz
No.A1685-11/12