FAN8461GX datasheet(9/14 Pages) FAIRCHILD

Part #	FAN8461GX

Description	Single Phase Full Wave BLDC Motor Driver

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Manufacturer	FAIRCHILD [Fairchild Semiconductor]

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FAN8461G

9

3. Hall Sensor Amplifier

Figure 2. Hall Sensor Interface

The hall current (IH) is determined as follows;

Where, RH is an external limiting resistor and Ri is input impedance of hall sensor. An external capacitor, CH1, can be used to

reduce a power supply noise.CH2 can reduce the instant peak current using H-bridge’s commutation. The input range of hall

amplifier is between 0V and VCC-2.8V as shown in following figure.

Figure 3. Hall Amplifier Input Range

Table 1. Hall Sensor Outputs and Related Pin outputs

8. Open Collector FG 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 resulting output signal has two pulses

per revolution on a four pole motor. It is recommednd that this FG output be higher than the GND potential.

9. 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 wind-

ing induactance and current need large value of CR.

10. Thermal Shutdown

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

°C)

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

°C)

H+

H-

LD

OUT 1

OUT 2

AL

TACO

Remark

H

L

Low Level

L

H

L

ROTATING

L

H

Low Level

H

L

H

--

-

H

L or H

LOCK

CH1

FAN8461G

IN-

IN+

1

2

V+

Hall

Sensor

CH2

RH

Ri

IH

VCC

R

H Ri

+

()

---------------------------

=

VS

V S - 2.8V

V S / 2

GN D

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