KA3084D 查看數據表（PDF） - Fairchild Semiconductor

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KA3084D

2-Phase BLDC Motor Driver

Fairchild Semiconductor 

KA3084D

Application Informations

1. A DIAGRAM SUMMARIZING THE ENTIRE SYSTEM

HALL+

IO

IC

4IC

2IC

Hall_IN

AMP.

DRIVE

HALL−

IC

If

4IC

GM

VCTL

V/I

Converter

VREG

TSD

R1

R2

FG_IN

AMP &

COMP

FG_OUT

PG_IN

AMP &

COMP

PG_OUT

Figure 1.

Figure 1 is a conceptual diagram of the KA3084D. It shows that it turns on or off depending on the signal of the hall sensor

used for sensing the rotor position of motor.

The AMP, GM (Feedback) and output blocks are circuits used to determine current gain of KA3084D.

Furthermore, HallIN represents the hall signal switch.

It supplies stable bias to each VREG block. The TSD block is a thermal shutdown circuit that protects the IC during an high

temperature inside the IC.

Moreover, FG. and PG. blocks output individual signals generated in the motor using the amplifier and comparator.

These signals transmit motor speed and position data to controller of external servo etc. for their control.

2. CURRENT CONTROL

Figure 2 simplifies figure 1.

The supplied IO current drives the motor and the Ic current controls the motor speed.

Figure 3 is a graph of ICTL vs. IO.

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