FAN8400D (FAN8400BD3)

9

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

2. Hall AMP Block

• Detection of rotor position using 3 phase hall sensors

• Determination of output commutation by hall signal

3. AGC Block

• This block is remained output amplitude.

• It is controlled by envelope through hall signals.

NOTES:

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

Hall U

Hall V

Hall W

Forward torque [ Reverse torque]

Output U

Output V

Output W

H

L

H

L [H]

H [L]

M [M]

H

L

L

L [H]

M [M]

H [L]

H

H

L

M [M]

L [M]

H [L]

L

H

L

H [L]

L [H]

M [M]

L

H

H

H [L]

M [M]

L [H]

L

L

H

M [M]

H [L]

L [H]

V

AGC

1

H

NI

H

I

–

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