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IP4001S

5-CH MOTOR DRIVE IC

APPLICATION SUMMARY (Continued)

- Tray motor drive part

CH5 is a forward/reverse controlled DC motor driver for tray motor. The forward or reverse movement of the

tray motor is controlled by the pins 9 and 14. The output voltage status according to the control input conditions

are shown in the table. The magnitude of the differential output voltage is determined by the control current

generator. The control input voltage, VCTL at the pin20 approximately appears across R1 and hence the control

current,

∆i is VCTL/R1. This current enters into the control current distributor, which generates two output

currents,

∆i1 and ∆i2. The magnitude of ∆i1 and ∆i2 are equal each other and is the same as ∆i. When the pin9

is high and the pin14 is low, the direction of the current flow of

∆i1 and ∆i2 are the same direction as shown in Fig.

5. On the contrary, when the pin9 is low and the pin14 is high, the direction of

∆i1 and ∆i2 are reversed. If both

the pins 9 and 14 are high or low at the same time,

∆i1 and ∆i2 become to be zero and the tray motor is in the

brake mode. When the output is not in the brake mode, the magnitude of the differential output voltage and the

CTL-to-output transfer gain are given as in the following equations. The resistors, R1 and R2 are selected such

that Gv has a typical value of 1.0 V/V. Rb1 and Rb2 are used for setting the output voltage when the pin20 is

open circuited. The typical output voltage as the pin20 is opened is about 3.1V for the supply voltage of 8V.

INPUT

FWD(PIN9)

REV(PIN14)

DO5+(PIN15)

DO5-(PIN16)

STATUS

High

High

Vpref

Vpref

Brake

High

Low

High

Low

Forward

Low

High

Low

High

Reverse

Low

Low

Vpref

Vpref

Brake

OUTPUT

⋅⋅

⋅

∂

∂

G v=

R2

V o= 2

C TL

R1

V o

R2

=2

C T L

R1

Fig. 3. Tray drive part

VCTL

Δi=

R1

Vo5+ = Pref - VCTL

R1

Vo5- = Pref + VCTL

R1