KA3030 データシートの表示（PDF） - Fairchild Semiconductor

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KA3030

6-Channel Motor Drive IC

Fairchild Semiconductor 

KA3030D

Application Information

1. REFERENCE INPUT & MUTE CIRCUITS

Pin 23 can be used as a reference input terminal and a mute terminal.

• Reference input circuit

An external allowable reference voltage to pin 23 is normally 2.5V.

In general conditions, pin 23 is used as the reference input terminal and is good to be used between about

2V-6.5V.

• Mute circuit

The following represents the conditions when the external mute is permitted to pin 23.

Mute voltage

Min.

Mute on voltage[V]

-

Mute off voltage[V]

2

Typ.

Max.

Device condition

-

0.5

Mute

-

-

Operate

2. THERMAL SHUT-DOWN CIRCUIT

VREF BG

R1

R2

Mute control

Q

The setting voltage of VBE

VBE = VREF BG × R2 / (R1 + R2) = 400mV

Because the thermal coefficient of VBE(Q) is −2mV / 1°C and if TR Q reaches 175°C from its normal off state

(at 25°C), VBE for turning on Q becomes 400mV, and then Q turns on and the mute control circuit operates.

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