LB11870 Datasheet, PDF (10/14 Pages) Sanyo Semicon Device – Three-Phase Brushless Motor Driver for Polygonal Mirror Motors

Continued from preceding page.
Pin No. Pin
Function
LB11870
VREG
Equivalent circuit
Phase lock state detection output.
29
29
LD
This output goes to the on state (low level) when the
phase is locked.
Start/stop control input
Low: 0 to 1.5 V
32
S/S High: 3.5 V to VREG
Hysteresis: 0.5 V
Low: start. This pin goes to the high level when open.
VREG
22kΩ
2kΩ
32
Clock input.
Low: 0 to 1.5 V
High: 3.5 V to VREG
33
CLK _{Hysteresis: 0.5 V}
f_CLK = 10 kHz (maximum)
If noise is a problem, use a capacitor to remove that
noise at this input.
VREG
Deceleration switching control input.
Low: 0 to 1.5 V
High: 3.5 V to VREG
34
BRSEL _{This pin goes to the high level when open.}
Low: reverse torque control, High: free running. An
external Schottky barrier diode is required on the output
low side if reverse torque control is used.
VREG
VREG
RF waveform smoothing.
35
PH
If noise on the RF waveform is a problem, insert a
capacitor between this pin and ground.
22kΩ
2kΩ
33
30kΩ
2kΩ
34
500Ω
35
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No. 7256 -10/14