LB11870 Datasheet, PDF (5/14 Pages) Sanyo Semicon Device – Three-Phase Brushless Motor Driver for Polygonal Mirror Motors

LB11870
Pin Functions
Pin
OUT1
OUT2
OUT3
IN1+, IN1–
IN2+, IN2–
IN3+, IN3–
FG IN+
FG IN–
GND1
GND2
PWM
FC
PD
EI
EO
TOC
FGFIL
CSD
Pin No.
3
1
46
11, 12
9, 10
6, 8
13
14
15
16
17
19
21
22
23
24
25
26
Outputs
The PWM signal controls the duty from the low side transistor.
Hall inputs for the three phases
The logic H state means that V_IN+ is greater than V_IN–.
FG comparator noninverting input
FG comparator inverting input
Control system ground
Subsidiary ground.
Sets the PWM oscillator frequency. Insert a capacitor between this pin and ground.
Current control circuit frequency characteristics correction. Insert a capacitor between this pin and ground.
Phase comparator output. Outputs the phase error as changes in the pulse duty.
Error amplifier input
Error amplifier output
Torque command input. This pin is normally connected to the EO pin. When the TOC potential falls, the low side output
transistor on duty is changed and the torque increases.
FG filter connection. Insert a capacitor between this pin and ground if noise on the FG signal is a problem.
Sets the operating time for the rotor constraint protection circuit and the initial reset operation.
Insert a capacitor between this pin and ground. If the rotor constraint protection circuit is not used, insert a resistor in
parallel with this capacitor.
CLD
FGS
LD
S/S
CLK
BRSEL
PH
VREG
VM1
VM2
V_CC2
V_CC1
GND3
FRAME
27
Sets the phase locked signal mask time. Insert a capacitor between this pin and ground. Leave this pin open if there is no
need to mask.
28
FG Schmitt output. This is an open-collector output.
29
Phase locked state detection output. This output goes to the on state when the PLL phase is locked. This is an open-
collector output.
32
Start/stop control input. Low: start, High or open: stop.
33
Clock input. The maximum input frequency is 10 kHz.
Deceleration control switching input. Low: Reverse torque control, High or open: free running.
34
An external Schottky barrier diode is required on the output low side if reverse torque control is used.
35
Smoothes the RF waveform. Insert a capacitor between this pin and ground.
36
5 V regulator output (control circuit power supply). Insert a capacitor between this pin and ground for power supply
stabilization.
37
Output block power supply. Short this pin to VM2.
38
Output current detection. Insert a resistor between this pin and V_CC1.
The maximum output current IOUT is set to be IOUT = 0.5/Rf.
39
Upper diode cathode connection. Short this pin to V_CC1.
40
Power supply. Insert a capacitor between this pin and ground to assure that noise does not enter the IC.
44
Output circuit block ground.
Connect this pin to ground. The FRAME pin is connected internally to the metal surface on the back of the package. To
improve thermal dissipation, solder this metal surface to the PCB.
2, 4, 5, 7
18, 20, 30
NC
31, 41, 42 Since these pins are not connected to the IC internally, they can be used for wiring connections.
43, 45, 47
48
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