LB11847 Datasheet, PDF (12/15 Pages) Sanyo Semicon Device – PWM Current Control Type Stepping Motor Driver

Sample Application Circuit
LB11847
10μF
5V
Logic input
28 27 26 25 24 23 22 21 20 19 18 17 16 15
LB11847
1
2
3
4
5
6
7
8
9 10 11 12 13 14
1.5V to 4.0V
voltage setting
1.5V
L
L
SBD
15kΩ
470pF
0.51Ω
SBD SBD
SBD
0.51Ω
15kΩ
42V
470pF
47μF
Notes on Usage
1. External diodes
Because this IC uses upper-side transistor switching in SLOW DECAY mode and dual-side transistor switching in
FAST DECAY mode, it requires external diodes between the OUT pins and ground for the regenerative current during
switching OFF. Use Schottky barrier diodes with low VF.
2. VREF pin
Because the VREF pin serves for input of the set current reference voltage, precautions against noise must be taken.
The input voltage range is 0 to 3.0V.
3. GND pin
The ground circuit for this IC must be designed so as to allow for high-current switching. Blocks where high current
flows must use low-impedance patterns and must be removed from small-signal lines. Especially the ground
connection for the sensing resistor RE at pin E, and the ground connection for the Schottky barrier diodes should be in
close proximity to the IC ground.
The capacitors between VCC and ground, and VBB and ground should be placed close to the VCC and VBB pins,
respectively.
No.6183-12/15