ML1469 Ver la hoja de datos (PDF) - Minilogic Device Corporation Limited

Número de pieza

componentes Descripción

Fabricante

ML1469

4-channel BTL driver for CD players

Minilogic Device Corporation Limited 

ML1469

_______________________________________________________________

™ Application Circuit

SERVO PRE AMP

TRACKING ACT

28

27

26

25

24

23

22

Vcc

SLED MOTOR

M

21

20

19

18

17

16

15

ML1469 V50

1

2

3

4

5

6

7

8

9

10

11

12

13

14

FOCUS ACT

MUTE

ON-Low

Vcc

OFF - High

5.0V Regulated Output

2SB1237

+

22uF

M

SPINDLE MOTOR

Precautions for use

(1) A thermal shut down circuit is built. The output current is muted, when the temperature of the chip reaches 175oC

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).

(6) The built-in input resistance has a positive temperature coefficient of 1500ppm/oC. When changing the gain using an

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.

BTL Driver for CD Player

4/5

May, 2004 V1.3

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