Car stereo 17 w two-channel btl af amplifier, Car stereo 20 w two-channel btl af amplifier, Monolithic linear ic – Sanyo EP93F User Manual

Page 31

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background image

LA4708

LA4708NF

LA4705NA

LA4705NA

+

+

-

0.1

µ

F

C6
2.2

R2
2.2

R3
0.1

µ

F

C7

NON-INVERTING
OUT1

INVERTING
OUT1

RL
2 to 4

POWER

PREDRIVER

16

17

POWER

PREDRIVER

15

**

**

LOAD SHORT

PROTECTOR

IN

+
-

+

+

-

0.1

µ

F

C8
2.2

R4
2.2

R5
0.1

µ

F

C9

INVERTING
OUT2

NON-INVERTING
OUT2

RL
2 to 4

2.2

µ

F/

6.3V

33

µ

F/

6.3V

1,9 Pin······Don' t use

10 Pin······Non connect

1,9,10 Pin······Non connect

+5V

C4

IN2

POWER

PREDRIVER

6

8

9

10

11

13

14

18

1

3

POWER

PREDRIVER

12

**

**

**

OUTPUT PIN TO VCC
SHORT PROTECTOR

RIPPLE

FILTER

STANDBY

SW

IN

+
-

7

5

4

+

100

µ

F/16V

C2

+

2.2

µ

F/

6.3V

C1

IN1

2

R1

10K

PRE GND

OUTPUT PIN-TO-GND

SHORT PROTECTOR

OUTPUT PIN-TO-GND

SHORT PROTECTOR

OVER VOLTAGE/

SURGE PROTECTOR

THERMAL

SHUTDOWN

VCC

POLYESTER FILM
CAPACITOR

C3

2200

µ

F

C5

VCC

VCC2

POWER
GND2

POWER
GND1

LOAD SHORT

PROTECTOR

N.C

OUTPUT PIN TO VCC
SHORT PROTECTOR

+

+

-

2.2

2.2

2.2

2.2

0.1

µ

F

0.1

µ

F

0.1

µ

F

0.1

µ

F

NON-INVERTING
OUT1

INVERTING
OUT1

RL
2 to 4

POWER

PREDRIVER

16

17

POWER

PREDRIVER

15

**

**

IN

+
-

+

+

+

0.47

µ

F/

6.3V

+

+

-

INVERTING
OUT2

NON-INVERTING
OUT2

RL
2 to 4

33

µ

F/

6.3V

+5V

IN2

POWER

PREDRIVER

6

8

9

10

11

13

14

18

1

3

POWER

PREDRIVER

12

**

**

**

OUTPUT PIN TO VCC
SHORT PROTECTOR

POP NOISE

PREVENTION

CIRCUIT

RIPPLE

FILTER

STANDBY

SW

IN

+
-

7

5

4

+

100

µ

F/16V

+

2.2

µ

F/

6.3V

2.2

µ

F/

6.3V

IN1

2

+

0.47

µ

F/

6.3V

10K

AMP

OFF ON

AMP

OFF ON

PRE GND

NC

OUTPUT PIN-TO-GND

SHORT PROTECTOR

OUTPUT PIN-TO-GND

SHORT PROTECTOR

OVER VOLTAGE/

SURGE PROTECTOR

THERMAL

SHUTDOWN

VCC

POLYESTER FILM
CAPACITOR

2200

µ

F

VCC

VCC2

VCC1

POWER
GND2

POWER
GND1

LOAD SHORT

PROTECTOR

NC

NC

OUTPUT PIN TO VCC
SHORT PROTECTOR

LOAD SHORT

PROTECTOR

BIAS

CIRCUIT

POP NOISE

PREVENTION

CIRCUIT

BIAS

CIRCUIT

57

Car Audio

58

Car Audio

Overview

Functions

Block Diagram

Overview

Functions

Block Diagram

Total output: 25 W + 25 W (VCC = 14.4 V, THD = 30%, RL = 4

)

Supports loads as low as RL = 2

Superb sound quality design (fL < 10 Hz, fH = 130 kHz)

Noise filter circuit does not require capacitors

The turn-on time can be set arbitrarily with an external capacitor

Extremely low levels of impulse noise

Built-in standby mode switching circuit (microcontroller support)

Built-in each protection circuit

Output pin-to-Vcc short

Output pin-to-GND short

Load short

Overvoltage

Thermal shutdown

Package: SIP18H

Monolithic Linear IC

Car Stereo 17 W Two-Channel BTL AF Amplifier

Monolithic Linear IC

Car Stereo 20 W Two-Channel BTL AF Amplifier

Monolithic Linear IC

Car Stereo 17 W Two-Channel BTL AF Amplifier

Monolithic Linear IC

Car Stereo 20 W Two-Channel BTL AF Amplifier

The LA4705NA is a two-channel BTL power amplifier IC designed for car stereo systems. It was designed with
particular emphasis placed on achieving superb audio quality.
The low band frequency characteristics were extended with a new capacitor-free noise filter circuit, and
improvements in both circuit and pattern designs allow crosstalk, a source of audio quality problems, to be
reduced, resulting in audio with powerful bass and clear treble.
The LA4705NA also features a full complement of protection circuits and a standby mode switch.

High power with a total output of 30 W + 30 W (VCC = 13.2 V, THD = 30%, RL = 4

)

Supports loads as low as RL = 2

(VCC = 13.2 V, THD = 30%, PO = 30 W)

Superb sound quality design (fL < 10 Hz, fH = 130 kHz)

Noise filter circuit does not require capacitors

The turn-on time can be set arbitrarily with an external capacitor

Extremely low levels of impulse noise

Built-in standby mode switching circuit (microcontroller support)

Built-in each protection circuit

Output pin-to-Vcc short

Output pin-to-GND short

Load short

Overvoltage

Thermal shutdown

Package: SIP18H

The LA4708NF is two-channel BTL power amplifier IC designed for car stereo systems. It was designed with
particular emphasis placed on achieving superb audio quality.
The low band frequency characteristics were extended with a new capacitor-free noise filter circuit, and
improvements in both circuit and pattern designs allow crosstalk, a source of audio quality problems, to be
reduced, resulting in audio with powerful bass and clear treble.
The LA4708NF also features a full complement of protection circuits and a standby mode switch.
Note that the LA4708NF is pin compatible with the LA4705NA (car stereo 17 W two-channel power amplifier
IC), and allows end product power to be increased simply by switching ICs.
(Pins 1 and 9 must be left open to allow the same circuit board to be used.)

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