No. 7256 -5/14

LB11870

Pin Functions

Pin

Pin No.

OUT1

OUT2

OUT3

3

1

46

Outputs

The PWM signal controls the duty from the low side transistor.

IN1+, IN1–

IN2+, IN2–

IN3+, IN3–

11, 12

9, 10

6, 8

Hall inputs for the three phases

FG IN+

13

FG comparator noninverting input

FG IN–

14

FG comparator inverting input

GND1

15

Control system ground

GND2

16

Subsidiary ground.

PWM

17

Sets the PWM oscillator frequency. Insert a capacitor between this pin and ground.

FC

19

Current control circuit frequency characteristics correction. Insert a capacitor between this pin and ground.

PD

21

Phase comparator output. Outputs the phase error as changes in the pulse duty.

EI

22

Error amplifier input

EO

23

Error amplifier output

TOC

24

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.

FGFIL

25

FG filter connection. Insert a capacitor between this pin and ground if noise on the FG signal is a problem.

CSD

26

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

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.

FGS

28

FG Schmitt output. This is an open-collector output.

LD

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.

S/S

32

Start/stop control input. Low: start, High or open: stop.

CLK

33

Clock input. The maximum input frequency is 10 kHz.

BRSEL

34

Deceleration control switching input. Low: Reverse torque control, High or open: free running.

An external Schottky barrier diode is required on the output low side if reverse torque control is used.

PH

35

Smoothes the RF waveform. Insert a capacitor between this pin and ground.

VREG

36

5 V regulator output (control circuit power supply). Insert a capacitor between this pin and ground for power supply

stabilization.

VM1

37

Output block power supply. Short this pin to VM2.

VM2

38

The maximum output current IOUT is set to be IOUT = 0.5/Rf.

39

40

Power supply. Insert a capacitor between this pin and ground to assure that noise does not enter the IC.

GND3

44

Output circuit block ground.

FRAME

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.

NC

2, 4, 5, 7

18, 20, 30

31, 41, 42

43, 45, 47

48

Since these pins are not connected to the IC internally, they can be used for wiring connections.