FAN8463 Ver la hoja de datos (PDF) - Fairchild Semiconductor

Número de pieza

componentes Descripción

Fabricante

FAN8463

BTL Single Phase Full Wave BLDC Motor Driver

Fairchild Semiconductor 

3. Hall Sensor Amplifier

Figure 2. Hall Sensor Interface

V+

IN2

3

FAN8463

1

IN1

RH1

Ri

Hall

Sensor

RH2

case1

2

HB

IN2

3

FAN8463

1

IN1

Ri

Hall

Sensor

RH

case2

The hall current (IH) is determined as follows;

IH=

-------------------V--------+---------------

RH1 + RH2 + Ri

case1

IH = -R---V-H----H-+----B-R-----i

case2

Where, RH1 or RH2 is an external limiting resistor and Ri is input impedance of hall sensor. An external resistor, RH1 or RH2, can be

used to decide an amplitude of hall signal. The input range of hall amplifier is between 0.3V and VCC-1.0V as shown in following fig-

ure.

Figure 3. Hall Amplifier Input Range

VCC

IN1 or IN2

IN1 or IN2

VCC/2

GND

Hall input available range

VCC-1V ~ 0.3V

OUT1 or OUT2

OUT1 or OUT2

Table1. Hall Sensor Outputs and Related Pin outputs

IN1 IN2

LD

OUT 1

OUT 2

L

H Low Level

H

L

H

L Low Level

L

H

-

-

-

-

FG

H

L

L or H

Remark

ROTATING

LOCK

4. Open Collector FG and 1/2FG Output for Speed Feedback

The FG output comes from the hall amplifier output. Because the FG output is open collector type, end user can pull up this pin with

a external resistor to the supply voltage of their choice(that is 5 or 3.3V). This FG output signal has two pulses per revolution on a four

pole motor and 1/2FG output signal has one pulse per revolution on a eight pole motor. It is recommended that this FG output be

higher than the GND potential.

5. Supply Voltage Consideration

A supply sustain capacitor(CR) should be placed as close to VCC pin with GND as layout permits. A reverse supply protection

diode(DR) prevent motor current from recirculating to power source when phase commutation occur. This results in increasing VCC

pin voltage. This capacitor absorbs motor recirculating current and limits VCC pin voltage. In general, large motor winding inductance

and current need large value of CR.

6. Thermal Shutdown

TSD on: Two high side outputs are off.(Typ. 175oC)

TSD off:The circuit can be reactivated and begin to operate in a normal condition. (Typ. 150oC)

FAN8463 Rev.1.0.0

9

www.fairchildsemi.com

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