M63028/029FP

Rev.1.0, Sep.16.2003, page 13 of 21

REF

SPIN

RSP

R1

R2

1.65v

CTL

VM1

Rs

HB

HU+

HU-

HV+

HV-

HW+

HW-

U

V

W

M

Rh

5V

GND

Slide channel

The relationship between the differential voltage between SLIN and REF and the torque is shown in following Figure.

The voltage gain[Gvo] is 1.0 [V/V]. The current gain is 2.0[A/V] (at sensing resistor : 0.5

Ω and R1=∞, R2=0 Ω) in

forward torque directions, and the dead zone is from 0mV to 80mV (at R1=

∞, R2=0 Ω)).

The coil current gain under the reverse torque is the same with in forward torque directions.And the limitation function

gets on when the differential voltage of VM2(12V) to RSL is 0.5V.

Therefore current-gain-control and current-limit of this IC is determined with sensing resister value.

Forward

Reverse

Dead zone

current limit

current limit

Gio

Gio

Dead zone