LA4708
LA4708NF
LA4705NA
LA4705NA
+
+
-
0.1
µ
F
C6
2.2
Ω
R2
2.2
Ω
R3
0.1
µ
F
C7
NON-INVERTING
OUT1
INVERTING
OUT1
RL
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
RL
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
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
Ω
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
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
RL
2 to 4
Ω
POWER
PREDRIVER
16
17
POWER
PREDRIVER
15
**
**
IN
+
-
+
+
+
0.47
µ
F/
6.3V
+
+
-
INVERTING
OUT2
NON-INVERTING
OUT2
RL
2 to 4
Ω
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
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
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
Ω
)
■
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
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
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
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.)
