SANYO LA4742

Ordering number : ENN7043
Monolithic Linear IC
LA4742
45 W Four-Channel (Bridge Circuit) Power Amplifier
Overview
Package Dimensions
The LA4742 is a 45 W 4-channel power amplifier IC for
car stereo systems. It features a built-in bridge circuit and
the ability to radically reduce the number of external
components required.
unit: mm
3236-HZIP25
[LA4742]
29.2
25.6
Features
4.5
• Maximum output power: 45 W × 4 channels
(VCC = 14.4 V, 4 Ω load, 1 kHz)
• 40 W × 4 channels (VCC = 13.7 V, 4 Ω load, 1 kHz)
• Requires only seven external components and does not
require an oscillation prevention RC circuit, a noise
filter, or a BS capacitor.
17.4
3.3
2.60
Functions
10.2
14.4
R1.7
(1.0)
2.0
0.4
4.0
0.53
4.0
2.0
• Output offset detection function (DDL)
• Warning tone (beep) generation function
• Muting function
• Built-in standby switch
• Full complement of built-in protection circuits,
including protection from shorting to VCC, shorting to
ground, load shorting, overvoltages, and overheating.
• Maximum supply voltage before damage in the open
ground state: 16 V
SANYO: HZIP25
Specifications
Maximum Ratings at Ta = 25°C
Parameter
Maximum supply voltage
Symbol
Conditions
Ratings
Unit
VCC max1
Signal present
18
VCC max2
No signal (for 1 minute)
26
V
4.5/ch
A
Maximum output current
IOpeak
Allowable power dissipation
Pd max
50
W
Operating temperature
Topr
–40 to +85
°C
Storage temperature
Tstg
–40 to +150
Package thermal resistance
With an arbitrarily large heat sink
V
θjc
1
°C
°C/W
Any and all SANYO products described or contained herein do not have specifications that can handle
applications that require extremely high levels of reliability, such as life-support systems, aircraft’s
control systems, or other applications whose failure can be reasonably expected to result in serious
physical and/or material damage. Consult with your SANYO representative nearest you before using
any SANYO products described or contained herein in such applications.
SANYO assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other
parameters) listed in products specifications of any and all SANYO products described or contained
herein.
SANYO Electric Co.,Ltd. Semiconductor Company
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
92101TN (OT) No. 7043-1/9
LA4742
Operating Conditions at Ta = 25°C
Parameter
Symbol
Recommended supply voltage
VCC
Recommended load resistance
RL
Operating supply voltage range
VCC op
Conditions
Ratings
Unit
14.4
V
4
Ω
9 to 18
V
Operating Characteristics at Ta = 25°C, VCC = 14.4 V, f = 1 kHz, RL = 4 Ω, Rg = 600 Ω
Parameter
Quiescent current
Standby current
Output offset voltage
Voltage gain
Voltage gain difference
Symbol
ICCO
Ist
VNoffset
VG
Total harmonic distortion
Rg = 0
VO = 0 dBm
THD = 10 %
PO max2
VIN = 5 Vrms
CHsep
Ripple rejection ratio
Output noise voltage
100
200
–100
25
23
26
350
SVRR
fr = 100 Hz, VR = 0 dBm, Rg = 0
50
VNO
Rg = 0, B.P.F. = 20 Hz to 20 kHz
µA
+100
mV
27
dB
+1
dB
W
40
W
W
0.4
65
80
%
dB
60
100
70
mA
10
28
0.05
55
VO = 20 dBm
Unit
max
45
PO = 4 W
VO = 0 dBm, Rg = 10 kΩ
Mute(att)
typ
–1
VCC = 13.7 V, VIN = 5 Vrms
THD
Ratings
min
Vst = 0 V
PO max1
Channel separation
Muting attenuation
RL = ∞, Rg = 0
∆VG
PO1
Output power
Conditions
dB
200
µVrms
dB
No. 7043-2/9
LA4742
Sample Application Circuit and Block Diagram
+
0.022µF
2200µF
VCC1/2
6
IN 1
+
11
VCC3/4
20
+
+
9
–
–
7
OUT 1+
0.22µF
10kΩ
+5V
25
Clip Detect
Circuit
OUT 1–
CLIP DET
Protective
Circuit
IN 2
+
12
8
–
+
5
+
–
3
0.22µF
Aux
Circuit
ST BY
4
+5V
ST ON
+ 10
R.F
47µF
IN 3
2
PWR GND 1
OUT 2+
OUT 2–
PWR GND 2
Stand by
Switch
Ripple
Filter
10kΩ
Mute
Mute
Circuit
22
+
3.3µF
+
15
–
+
17
1
+
–
19
13
Protective
Circuit
OUT 3+
Low Level
Mute ON
0.22µF
AUX IN
+
0.22µF
PRE GND
IN 4
+
14
18
–
+
21
+
–
23
0.22µF
ON TIME C
16
+
22µF
Muting &
ON Time Control
Circuit
24
OUT 3–
PWR GND 3
OUT 4+
OUT 4–
PWR GND 4
Top view
A13765
No. 7043-3/9
LA4742
Pin Functions and Equivalent Circuits at VCC = 14.4 V, ST-BY = 5 V
Pin No.
Function
1
AUX IN
DC voltage [V]
Notes
Internal equivalent circuit
2
8
18
POWER GND
24
VCC
130 Ω
3
–OUT2
5
+OUT2
7
–OUT1
9
+OUT1
17
+OUT3
19
–OUT3
21
+OUT4
23
Lowsaturation
voltage circuit
3
5
2.7
7
9
17
130 Ω
–OUT4
19
21
23
A13766
10 kΩ
4
4
• The amplifier will be on when the
applied voltage is between 2 V and
VCC.
ST-BY
30 kΩ
1.5 kΩ
A13767
6
VCC1/2
20
VCC3/4
Bias circuit ST-BY power
supply line
Input amplifier ST-BY
power supply line
10
SVR
13.2
VCC
• Low ripple power supply line for all
internal IC blocks
200 Ω
200 Ω
1 kΩ
10
A13768
Continued on next page.
No. 7043-4/9
LA4742
Continued from preceding page.
Pin No.
Function
DC voltage [V]
Notes
Internal equivalent circuit
Input amplifier
ST-BY power
supply line
5 pF
11
IN1
12
IN2
14
IN4
15
IN3
VREF
3.1
30 kΩ
1 kΩ
Inverter
amplifier
• Input amplifiers that require no
capacitor in the input noise filter.
100 Ω
11
12
14
15
13
A13769
PRE GND
Bias circuit
power supply line
20 kΩ
VREF
2 kΩ
• Amplifier turn-on time control circuit
16
ON TIME MUTE
2.6
• Impulse noise prevention circuit
• With a 22 µF capacitor, the turn-on
time will be 0.6 s.
16
10 kΩ
200 Ω
2 kΩ
40 kΩ
13 kΩ
A13770
Input amplifier
ST-BY power
supply line
22
MUTE
4.1
• The muting function is activated when
the applied voltage is under 1 V.
3 kΩ
1 kΩ
100 Ω
VREF
22
7.5 kΩ
10 kΩ
Amplifier
bias circuit
VREF
100 kΩ
A13771
25
CLIPDET
No. 7043-5/9
LA4742
Notes on Usage and Handling
• Oscillator stabilization
In some cases, details of the printed circuit board layout may lead to induced parasitic oscillation. This oscillation can
be prevented by adding any one of the following components. Verify the optimal values for these capacitors by testing
in actual end products.
Technique 1 ... Connect Mylar capacitors (0.1 µF) between the BTL amplifier outputs.
Technique 2 ... Connect an RC circuit (2.2 Ω and 0.1 µF in series) between each output and ground.
• Audio quality (low band)
The low-band frequency characteristics can be improved by adjusting the values of the input capacitors. The
recommended value is 2.2 µF.
• Impulse noise
The LA4742 includes a built-in impulse noise suppression circuit. However, further improvement can be achieved by
using the muting circuit. When first applying power, activate the muting function at the same time as applying power.
Then, after the output DC potential has stabilized, turn off the muting function. When turning off the power, first
activate the muting function and then turn off the power. Sample transient responses are attached (see the timing
charts).
Transient Responses at Power On
Power on: Standby and muting activated at the same time.
Muting is turned off after the output has stabilized.
5 [V]
External 10 kΩ muting switch
MUTE
0
MUTE OFF
Standby set high
5 [V] Standby pin
0 [V]
4
Output pin
2
Mute 10 kΩ
22
0
3.3 µF
+
ON TIME
200 ms/div
Transient Responses at Power Off
Power off: After activating the muting circuit, turn the power off.
5 [V]
0
External 10 kΩ muting switch
MUTE
5 [V]
Standby set low
0 [V] Standby pin
4
2
0
Output pin
Mute 10 kΩ
22
3.3 µF
+
200 ms/div
No. 7043-6/9
LA4742
250
4
O
I CC
200
3
VN
150
2
100
I CCO
1
VN
50
0
0
5
10
15
100
7
5
3
2
5
Output power, PO — W
Quiescent current, ICCO — V
RL=Open
Rg=0Ω
Vst=5 V
Output pin voltage, VN — V
ICCO, VN — VCC
300
1.0
7
5
3
2
0.1
7
5
3
2
0
25
20
10
7
5
3
2
PO — VIN
VCC=14.4V
RL=4Ω
f=1kHz
Rg=600Ω
VG=26dB
All channels driven
0.01
10
2
3
5
Supply voltage, VCC — V
PO — VCC
48
Output power, PO — W
40
36
Total harmonic distortion, THD — %
RL=4Ω
f=1kHz
Rg=600Ω
THD=10%
All channels driven
44
32
28
24
20
16
12
8
4
8
10
12
14
16
18
10
7
5
THD — PO
3
2
1
7
5
3
2
0.1
7
5
3
2
2
3
5
7
1
2
3
5
7 10
3
2
10
7
5
2
3
Output power, PO — W
5
0.1
7
5
OUT2, 4
3
2
OUT1, 3
2
3
5 7
100
7
5
3
2
OU
4
5 7 100
10
7
5
3
2
2
3
5
1
7
5
3
2
0.1
7
5
3
2
2
3
5
7
1
2
3
5
7 10
7 100
2.2 µF
0.2
–2
2µ
F
0
–4
VCC=14.4V
RL=4Ω
Rg=600Ω
VO=0 dBm at f = 1 kHz
ALL channels driven
–6
2 3
5 7 100
THD — PO
–8
2 3
5 7 10
VCC=14.4V
RL=4Ω
f=10kHz
Rg=600Ω
All channels driven
,3
10
3
T1
0.01
2
1
2
2
3
2
3
3
2
f — Response
3
T2,
2
7 10k
4
1
7
5
0.1
7
5
5
Output power, PO — W
Response — dB
2
3
1
7
5
0.01
0.1
7 100
VCC=14.4V
RL=4Ω
Rg=600Ω
PO=2W
All channels driven
OU
Total harmonic distortion, THD — %
3
2
3
2
THD — f
10
7
5
7 1k
Output power, PO — W
VCC=14.4V
RL=4Ω
f=1kHz
Rg=600Ω
All channels driven
0.01
0.1
5
VCC=14.4V
RL=4Ω
f=100Hz
Rg=600Ω
All channels driven
0.01
0.1
20
Total harmonic distortion, THD — %
Total harmonic distortion, THD — %
3
2
3
THD — PO
100
7
5
Supply voltage, VCC — V
100
7
5
2
7 100
Input level, VIN — mVrms
5 7 1k
2 3
5 7 10k
Input frequency, f — Hz
2 3
5 7100k
–10
10
2 3
5 7 100
2 3
5 7 1k
2 3
5 7 10k
2 3
5 7100k
Input frequency, f — Hz
No. 7043-7/9
LA4742
CH Sep — f
CH Sep — f
0
VCC=14.4V
RL=4Ω
Rg=10kΩ
VO=0dBm
–20
Channel separation, CH Sep — dB
Channel separation, CH Sep — dB
0
–40
1→3
1→2
–60
1→4
–80
–100
10
2 3
5 7 100
2 3
5 7 1k
2 3
5 7 10k
2 3
VCC=14.4V
RL=4Ω
Rg=10kΩ
VO=0dBm
–20
–40
–60
2→3
–80
–100
10
5 7100k
2→1
2→4
2 3
Input frequency, f — Hz
5 7 100
CH Sep — f
Channel separation, CH Sep — dB
Channel separation, CH Sep — dB
–40
3→4
3→2
–80
–100
10
2 3
5 7 100
2 3
5 7 1k
2 3
5 7 10k
2 3
–20
–60
4→
2
4→3
4→1
–80
–100
10
5 7100k
2 3
5 7 100
7
5
3
2
7
5
3
2 3
5 7 10k
2 3
Input resistor, Rg — Ω
100
]
Pd
2
[W
10
I CC
10
[A]
7
5
1
3
2
1
0.01 2 3
5 7 0.1
2 3
5 7 1
2 3
5 7 10k
2 3
5 7100k
5 7 10
Output power, PO — °C
VCC=14.4V
RL=4Ω
Rg=0Ω
VCCR=0dBm
–40
–60
–80
2 3
5 7100
2 3
5 7 1k
2 3
5 710k
2 3
5 7100k
Ripple frequency, fr — Hz
Pd, ICC — PO
VCC=14.4V
RL=4Ω
Rg=600Ω
f=1kHz
All channels driven
2 3
–20
–100
10
5 7100k
2 3
0.1
5 7 100
Current drain, ICC — A
100
Power dissipation, Pd — W
Ripple rejection ratio, SVRR — dB
0.1
ICCO — Ta
300
Quiescent current, ICCO — mA
Output noise voltage, VNO — mVrms
2
5 7 1k
5 7 1k
0
3
2 3
2 3
Input frequency, f — Hz
VCC=14.4V
RL=4Ω
DIN AUDIO
5 7 100
5 7100k
SVRR — fr
5
2 3
2 3
–40
VNO — Rg
7
0.01
10
5 7 10k
VCC=14.4V
RL=4Ω
Rg=10kΩ
VO=0dBm
Input frequency, f — Hz
1
2 3
0
VCC=14.4V
RL=4Ω
Rg=10kΩ
VO=0dBm
–20
–60
5 7 1k
CH Sep — f
0
3→1
2 3
Input frequency, f — Hz
VCC=14.4V
RL=OPEN
Rg=0Ω
250
200
150
100
50
0
–60
–40
–20
0
20
40
60
80
100
Ambient temperature, Ta — °C
No. 7043-8/9
LA4742
Total harmonic distortion, THD — %
THD — Ta
10
7
5
VCC=14.4V
RL=4Ω
Rg=600Ω
f=1kHz
PO=2W
All channels driven
3
2
1
7
5
3
2
0.1
7
5
3
2
0.01
–60
–40
–20
0
20
40
60
Ambient temperature, Ta — °C
80
100
Specifications of any and all SANYO products described or contained herein stipulate the performance,
characteristics, and functions of the described products in the independent state, and are not guarantees
of the performance, characteristics, and functions of the described products as mounted in the customer’s
products or equipment. To verify symptoms and states that cannot be evaluated in an independent device,
the customer should always evaluate and test devices mounted in the customer’s products or equipment.
SANYO Electric Co., Ltd. strives to supply high-quality high-reliability products. However, any and all
semiconductor products fail with some probability. It is possible that these probabilistic failures could
give rise to accidents or events that could endanger human lives, that could give rise to smoke or fire,
or that could cause damage to other property. When designing equipment, adopt safety measures so
that these kinds of accidents or events cannot occur. Such measures include but are not limited to protective
circuits and error prevention circuits for safe design, redundant design, and structural design.
In the event that any or all SANYO products (including technical data, services) described or contained
herein are controlled under any of applicable local export control laws and regulations, such products must
not be exported without obtaining the export license from the authorities concerned in accordance with the
above law.
No part of this publication may be reproduced or transmitted in any form or by any means, electronic or
mechanical, including photocopying and recording, or any information storage or retrieval system,
or otherwise, without the prior written permission of SANYO Electric Co., Ltd.
Any and all information described or contained herein are subject to change without notice due to
product/technology improvement, etc. When designing equipment, refer to the “Delivery Specification”
for the SANYO product that you intend to use.
Information (including circuit diagrams and circuit parameters) herein is for example only; it is not
guaranteed for volume production. SANYO believes information herein is accurate and reliable, but
no guarantees are made or implied regarding its use or any infringements of intellectual property rights
or other rights of third parties.
This catalog provides information as of September, 2001. Specifications and information herein are
subject to change without notice.
PS No. 7043-9/9