LB11870 Datasheet, PDF (7/14 Pages) Sanyo Semicon Device – Three-Phase Brushless Motor Driver for Polygonal Mirror Motors

LB11870
Pin Functions
Pin No.
3
1
46
Pin
OUT1
OUT2
OUT3
Motor drive output
Function
44
GND3 Output block ground
Output block power supply and current detection.
37
VM1 Insert the resistor Rf between this pin and V_CC1.
38
VM2 The output current will be limited to the current value
I_OUT = VRF/Rf.
VCC1
Equivalent circuit
39
300Ω
38
37
1 3 46
39
V_CC2 Upper diode cathode connection. Short this pin to V_CC1.
VREG
11
IN1+ Hall element inputs.
12
IN1– The high state is when IN+ is greater than IN-, and the
9
IN2+ ^{low state is the reverse.}
10
IN2–
An amplitude of at least 100 mVp-p (differential) is
300Ω
desirable for the Hall element signal inputs. If noise on ^{6 9 11}
6
IN3+ _{the Hall signals is a problem, insert capacitors between}
8
IN3– the IN+ and IN– inputs.
44
300Ω
8 10 12
FG input.
13
FGIN+ _{If noise on the FG signal input is a problem, connect a}
14
FGIN– filter consisting of either a capacitor or a capacitor and a
resistor.
VREG
300Ω
13
300Ω
14
15
GND1 Control circuit block ground
16
GND2 SUBGND pin
Continued on next page.
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