No. 6209-6/9

LB11985H

Pin Functions

Pin No.

Symbol

Pin Voltage

Description

Equivalent circuit

Ground for circuits other than the output transistors.

The lowest potential of the output transistors will be

the that of the RF pin.

Output block power supply

1

VS1

8 V to 15 V

6

7

8

2

1

5

20

Ω

50 k

Ω

20

Ω

50 k

Ω

A13015

9

VS1

A13016

Coil output

6

Motor midpoint connection.

Half-wave drive is implemented by connecting the

motor midpoint to this pin.

9

MCOM

Continued on next page.

A diode is internally connected between VS1 and

this pin to prevent reverse current flow in half-wave

operating mode.

2

VS2

Ground sensing.

The influence of the common ground impedance on

Rf can be excluded by connecting this pin to the

ground near the Rf resistor in the motor ground lines

that include RF. (This pin must not be left open.)

3

GSENSE

Output current detection.

Current feedback is applied to the control block by

inserting the resistor Rf between these pins and

ground. Also, both the lower side saturation

prevention circuit and the torque ripple correction

circuit operate according to the voltage on this pin. In

particular, since this voltage sets the oversaturation

prevention level, the lower side oversaturation

prevention operation can be degraded if the value of

this resistor is set too low.

Note that the POWER pin and the SENSE pin must

be connected together.

4

5

RF(SENSE)

RF(POWER)

7

8

FRAME GND

Unit (resistance :

Ω )