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ML1469

BTL Driver for CD Player

May, 2004 V1.3

Application Circuit

ML1469 V50

SERVO PRE AMP

M

M

Vcc

Vcc

5.0V Regulated Output

+

22uF

2SB1237

FOCUS ACT

TRACKING ACT

SPINDLE MOTOR

MUTE

ON-Low

OFF - High

SLED MOTOR

28

27

26

25

24

23

22

21

20

19

18

17

16

15

1

2

3

4

5

6

7

8

9

10

11

12

13

14

Precautions for use

typical.

(2) It the mute (Pin 7) voltage is open or less than 0.5V, the output current is muted. Under normal operating conditions,

make sure to pull this pin above 2.0V.

(3) If the bias pin (Pin 23) drops below 1.4V, the output current is muted. Make sure that under normal conditions, this

pin is at 1.6V or above.

(4) If the power supply voltage drops below 4.5V typical, the drivers are turned off. When the voltage exceeds 4.7V

typical, the drivers return to their previous state.

(5) The channel 4 output is muted in the event of a thermal shut down, mute on, bias pin voltage drop. Other sections are

not muted. When muted, the internal bias voltage of the output pin becomes (roughly (VCC-VF)/2).

external resistance, the gain will change as the temperature of the resister changes. When using the built-in input

resistance, there are virtually no gain variation due to temperature.

(7) Make sue to connect a 0.47uF capacitor to the IC input to filter out voltage ripple.

(8) Heat dissipation fins are attached to the GND on the inside of the package. Make sure to connect these to the external

GND.

(9) The capacitor connected between the regulator output (Pin 6) and the GND also serves to stop oscillation of the IC

circuit. Consequently, make sure to use one with good temperature characteristics.

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