FAN8400BD3 データシートの表示（PDF） - Fairchild Semiconductor

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FAN8400BD3

3-Phase BLDC Motor Driver with PLL

Fairchild Semiconductor 

Application Information

1. Output Block

• 3 Phase power transistor and free wheeling diodes

• Reverse active type upper side diodes and parasitic lower side diodes

• full wave current linear drive with current feedback

• Connection with external capacitor to prevent voltage spike and oscillation by current drive

• Output transistor commutation by "Winner takes all" method

• Built in over current limit (OCL) circuit

FAN8400D (FAN8400BD3)

2. Hall AMP Block

• Detection of rotor position using 3 phase hall sensors

• Determination of output commutation by hall signal

Hall U

Hall V

Hall W

H

L

H

H

L

L

H

H

L

L

H

L

L

H

H

L

L

H

3. AGC Block

• This block is remained output amplitude.

• It is controlled by envelope through hall signals.

Forward torque [ Reverse torque]

Output U

Output V

Output W

L [H]

H [L]

M [M]

L [H]

M [M]

H [L]

M [M]

L [M]

H [L]

H [L]

L [H]

M [M]

H [L]

M [M]

L [H]

M [M]

H [L]

L [H]

V

AGC

∝

---------1-----------

HNI – HI

NOTES:

VAGC is voltage of AGC output.

HNI is hall non inverting input voltage.

HI is hall inverting voltage.

4. Speed Control Block

• Digital phase locked loop (PLL) circuit

• Generating error pulse between rising edge of clock and falling edge of FG signal.

• High precision stable speed control

9

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