FAN8024ED Просмотр технического описания (PDF) - Fairchild Semiconductor

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FAN8024ED

4-Channel Motor Driver

Fairchild Semiconductor 

Application Information

1. Reference Input & and Stand-by Function

• Reference input (PIN 27)

The applied voltage at the reference input pin must be between 0.8V and 6.5V, when VCC=8.5V.

• Stand-by input (PIN 28)

The following input conditions must be satisfied for the stand-by function.

Stand-by input voltage

Below 0.5V or open

Above 2.0V

OPERATION

The stand-by function is activated so the bias block and

power block are disabled

Recover the normal operation

2. Protection Function

Thermal shutdown (TSD)

If the chip temperature rises above 175°C, the thermal shutdown (TSD) circuit is activated and the output circuit enters the mute

state, which is off state. The TSD circuit has a temperature hysteresis of 25°C.

3. Separation of Power Supply

• PVCC1 (PIN 9)

PVCC1 is the power supply for the loading driver. The range is between 5V~12V.

• PVCC2 (PIN 21)

PVCC2 is the power supply for the actuator drivers that include focus and tracking actuators. The range is between 5V~12V

• VCC (PIN 8)

VCC pin supplies power for the sled driver and the signal logic part. VCC≥PVCC1(PVCC2).

4. Current feedback channels (channel 1 & and 4)

Command

20k

10k

ref

current feedb ack amp

poweramp

7.5k

7.5k

X2

actuator

Sensing resistor

Rext Cext

• The reference voltage(ref) is supplied externally through pin 27.

• The input OP-amp output signal is amplified by (20K/10K) times and then fed to the current feedback amplifier.

• The current feedback amplifier compares the output current sensed input and command input and then makes the controlled out-

put to eliminate delay effect of the load. Please refer to the Application Note 4109 for additional information about current feedback

theory (http://www.fairchildsemi.com/an/AN/AN-4109.pdf).

• The DC gain of current feedback amplifier and power amplifier is unity, which is 1 [A/V]. Users can change the gain by adding

external resistor at the command input.

8

FAN8024ED Rev. 1.0.0

www.fairchildsemi.com

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