FAN8420D3 Просмотр технического описания (PDF) - Fairchild Semiconductor

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производитель

FAN8420D3

3-Phase BLDC Motor Driver

Fairchild Semiconductor 

2. Short Brake

VCC

ON

OFF

18

1kΩ

20kΩ

OFF

2

ON

4

7

FAN8420D3

MOTOR

Pin # 18

High

Low

Short brake

On

Off

When the pick-up mechanism moves from the inner to the outer spindle of the CD, the brake function of the reverse voltage is

commonly employed to decrease the rotating velocity of the spindle Motor.

However, if the spindle motor rotates rapidly, the brake function of the reverse voltage may produce more heat at the Drive IC.

To remove this shortcoming and to enhance the braking efficiency, the short brake function is added to FAN8420D3. When the

short brake function is active, all upper power TRs turn off and all lower power TRs turn on, and the motor slows down. But

FG and DIR functions continue to operate normally.

3. Power Save

VCC

Start

Stop

23

40kΩ

30kΩ

OFF

2

OFF

4

7

MOTOR

Pin # 23

High

Low

Start/Stop

Operate

Stop

When power save function is active, all power TRs turn off.

Rev. 1.0.1

9

Oct. 2000.

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