LA4450 Ver la hoja de datos (PDF) - ON Semiconductor

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componentes Descripción

Fabricante

LA4450

2-Channel, 26V, Power Amplifier for Bus and Track in Car Stereo

ON Semiconductor 

LA4450

Test Circuit

+

100μF

VCC=26.4V

+ 1000μF

IN1

100μF+

10

7

DC

VCC

9

IN1

8

NF1

+

CH1

−

BS1 6

5

OUT1

11

PRE

GND

LA4450

CH1

PWR 4

GND

CH2

PWR 3

GND

+ 47μF

+ 1000μF

0.15μF

* RL=8Ω

2.2Ω

IN2

+

100μF

13

IN2

14

NF2

+

CH2

−

ST

12

BS2 1

2

OUT2

+ 47μF

1000μF

+

0.15μF

* RL=8Ω

2.2Ω

OFF

ON

10kΩ

+

5V

*Polyester Film Capacitor

1. Features and Usage Notes

 Pin 12 is the standby pin. The IC operates when a voltage of 2V or higher is applied through the external resistor R1.

Note that the maximum influx current to pin 12 is 500A.

 Changing the voltage gain

The voltage gain VG can be lowered by connecting an

IN

75Ω

NF

RNf’

+

CNF

+

−

30KΩ

external resistor in series between the NF pin (pins 8 and 14)

OUT

and CNF.

VG

=

20log

30k

75RNf

’

However, since the IC may oscillate if VG is 30dB or lower,

use a VG of 36dB or higher.

 The LA4450 includes a thermal protection circuit to prevent damage to or destruction of the IC due to abnormal

overheating. As a result, the output may be attenuated or cut off if the application heat sinking is inadequate.

 The LA4450 includes an overvoltage protection circuit to protect the IC against power supply surges and abnormal

voltages. This circuit has hysteresis characteristics : it operates at between 39 and 40V, and recovers at around 34V.

 Although the LA4450 includes a current limiter circuit to prevent damage due to abnormal currents, care must still be

exercised to prevent load shorts and other excessive current conditions.

No.4090-4/8

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