Sanyo EP93F Car Stereo System User Manual


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LA4708LA4708NFLA4705NALA4705NA
+
+
-
0.1
µ
F
C6
2.2
Ω
R2
2.2
Ω
R3
0.1
µ
F
C7
NON-INVERTING
OUT1
INVERTING
OUT1
R
L
2 to 4
Ω
POWER
PREDRIVER
16
17
POWER
PREDRIVER
15
**
**
LOAD SHORT
PROTECTOR
IN
+
-
+
+
-
0.1
µ
F
C8
2.2
Ω
R4
2.2
Ω
R5
0.1
µ
F
C9
INVERTING
OUT2
NON-INVERTING
OUT2
R
L
2 to 4
Ω
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
1813
POWER
PREDRIVER
12
**
**
**
OUTPUT PIN TO V
CC
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
Ω
PRE GND
OUTPUT PIN-TO-GND
SHORT PROTECTOR
OUTPUT PIN-TO-GND
SHORT PROTECTOR
OVER VOLTAGE/
SURGE PROTECTOR
THERMAL
SHUTDOWN
V
CC
POLYESTER FILM
CAPACITOR
C3
2200
µ
F
C5
V
CC
V
CC
2
POWER
GND2
POWER
GND1
LOAD SHORT
PROTECTOR
N.C
OUTPUT PIN TO V
CC
SHORT PROTECTOR
+
+
-
2.2
Ω
2.2
Ω
2.2
Ω
2.2
Ω
0.1
µ
F
0.1
µ
F
0.1
µ
F
0.1
µ
F
NON-INVERTING
OUT1
INVERTING
OUT1
R
L
2 to 4
Ω
POWER
PREDRIVER
16
17
POWER
PREDRIVER
15
**
**
IN
+
-
+
+
+
0.47
µ
F/
6.3V
+
+
-
INVERTING
OUT2
NON-INVERTING
OUT2
R
L
2 to 4
Ω
33
µ
F/
6.3V
+5V
IN2
POWER
PREDRIVER
6 8 9 10 11
13
14
1813
POWER
PREDRIVER
12
**
**
**
OUTPUT PIN TO V
CC
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
Ω
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
V
CC
POLYESTER FILM
CAPACITOR
2200
µ
F
V
CC
V
CC
2
V
CC
1
POWER
GND2
POWER
GND1
LOAD SHORT
PROTECTOR
NCNC
OUTPUT PIN TO V
CC
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 (V
CC
= 14.4 V, THD = 30%, R
L
= 4Ω)
■ Supports loads as low as R
L
= 2 Ω
■ Superb sound quality design (f
L
< 10 Hz, f
H
= 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 (V
CC
= 13.2 V, THD = 30%, R
L
= 4 Ω)
■ Supports loads as low as R
L
= 2 Ω (V
CC
= 13.2 V, THD = 30%, P
O
= 30 W)
■ Superb sound quality design (f
L
< 10 Hz, f
H
= 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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