MM1538 データシートの表示（PDF） - Mitsumi

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MM1538

4-ch Motor Driver for Portable CD Players

Mitsumi 

MITSUMI

4ch Moter driver IC for Portable CD Player

3 DC-DC converter block

(1) Output voltage

· 3.2V typ. voltage multiplier circuit can be constructed using external components. This voltage can be

varied with the addition of an external resistor. The setting method is as follows.

VSYS1=1.2

R1 · R3 R2 · R4

+

R1+R3 R2+R4

(V)

R2 · R4

R2+R4

VSYS1

12

R1

7

EI

R2

R3

R4

1.2V

R1=external resistor

R2=external resistor

R3=35kΩ

R4=21kΩ

(2) Short protect function

· When the error amplifier output(6PIN)has switched to the high-level state,SPRT(8PIN)is charged, and when

the voltage reaches 1.2V typ. , the SW(5PIN)switching stops.The time until switching stops is set by the

capacitor connected to SPRT(8PIN)according to the following formula.

t=CSPRT

VTH (sec) (VTH=1.2V, ISPRT=10µA)

ISPRT

(3) Soft start function

· The soft start function operates when a capacitor is connected between DEAD(4PIN)and GND.

Also, the maximum duty can be varied by connecting a resistor to 4PIN.

t=CDEAD R (sec) (R=65kΩ)

(4) Power off function

· When low-level is applied to OFF(40PIN), SPRT(8PIN)is charged, and when the voltage reaches 1.2V typ. ,

the SW(5PIN)switching stops. The time until switching stops is set by the capacitor connected to

SPRT(8PIN)according to the following formula.

t=CSPRT VTH (sec) (VTH=1.2V, IOFF=20µA)

IOFF

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