Sanyo EP93F manual LA4705NA, LA4708NF8

Monolithic Linear IC

Car Stereo 17 W Two-Channel BTL AF Amplifier

LA4705NA

Overview

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.

Functions

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

■Supports loads as low as RL = 2 Ω

■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

Block Diagram

100∝F/16V

+

VCC

NC

VCC1

+

3

1

2200∝F

18

RIPPLE

OUTPUT PIN TO VCC

FILTER

SHORT PROTECTOR

INVERTING

IN1

PREDRIVER

POWER

17

OUT1

∝

+

2

**

0.1 F

+

+

LOAD SHORT

POWER

2.2Ω

RL

2.2∝F/

IN

16

-

PROTECTOR

GND1

Ω

6.3V

15**

2.2Ω

-

2 to 4

PREDRIVER

POWER

0.1∝F

PRE GND

NON-INVERTING

4

BIAS

OUTPUT PIN-TO-GND

**

OUT1

CIRCUIT

OVER VOLTAGE/

VCC SHORT PROTECTOR

AMP

SURGE PROTECTOR

POLYESTER FILM

10KΩ

THERMAL

CAPACITOR

OFF ON

5

STANDBY

OUTPUT PIN-TO-GND

SHUTDOWN

SW

SHORT PROTECTOR

+5V

NON-INVERTING

14

OUT2

PREDRIVER

POWER

IN2

0.1∝F

+

+

7

+

LOAD SHORT

POWER

**

2.2Ω

RL

2.2∝F/

- IN

PROTECTOR

GND2

13

2.2Ω

-

2 to 4Ω

6.3V

**

PREDRIVER

POWER

0.1∝F

POP NOISE

12

INVERTING

OUTPUT PIN TO VCC

OUT2

PREVENTION

CIRCUIT

SHORT PROTECTOR

6

8

9

10

11

+

+

NC

NC

VCC2

33∝F/

0.47∝F/

1,9,10 Pin······Non connect6.3V

6.3V

Monolithic Linear ICIC

Car Stereo 20 WW TwoTwo--ChannelChannelBTLBTL AFAF AmplifierAmplifier

LA4708NF8

Overview

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.)

Functions

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

■Supports loads as low as RL = 2 Ω (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

Block Diagram

100∝F/16V

+

VCC

C2

+

3

1

18

C5

2200∝F

RIPPLE

OUTPUT PIN TO VCC

INVERTING

FILTER

SHORT PROTECTOR

C1

PREDRIVER

POWER

17

OUT1

0.1∝F

IN1

**

C6

+

2

+

+

LOAD SHORT

POWER

2.2Ω

RL

IN

16

R2

∝

-

PROTECTOR

GND1

2.2Ω

Ω

2.2 F/

R3

-

2 to 4

6.3V

**

PREDRIVER

POWER

C70.1∝F

PRE GND

15

NON-INVERTING

4

BIAS

OUTPUT PIN-TO-GND

**

OUT1

CIRCUIT

OVER VOLTAGE/

VCC SHORT PROTECTOR

AMP

R1

SURGE PROTECTOR

POLYESTER FILM

THERMAL

CAPACITOR

OFF ON

10KΩ

STANDBY

5

OUTPUT PIN-TO-GND

SHUTDOWN

SW

SHORT PROTECTOR

+5V

NON-INVERTING

14

OUT2

C4

PREDRIVER

POWER

0.1∝F

IN2

**

C8

+

7

+

+

LOAD SHORT

POWER

2.2Ω

RL

13

R4

2.2∝F/

- IN

PROTECTOR

GND2

2.2Ω

-

2 to 4Ω

6.3V

**

R5

PREDRIVER

POWER

C90.1∝F

POP NOISE

12

INVERTING

OUTPUT PIN TO VCC

OUT2

PREVENTION

CIRCUIT

SHORT PROTECTOR

6

8

9

10

11

1,9 Pin······Don' t use

∝

+

∝ +

N.C

VCC2

10 Pin······Non connect

33 F/

C3

0.47 F/

6.3V

6.3V

57 Car Audio 58 Car Audio