SANYO LA4628

Ordering number : ENN6632
Monolithic Linear IC
LA4628
Overview
Package Dimensions
The LA4628 is a 2-channel general-purpose BTL audio
power amplifier provided in a miniature package. It was
designed for the best possible audio quality and features
an extended low band roll-off frequency provided by a
newly-developed NF circuit that does not require an
external capacitor. Furthermore, crosstalk, which can
cause muddiness in the audio output, has been
significantly reduced by both circuit and wiring pattern
improvements. Thus this amplifier can provide powerful
lows and clear highs.
unit: mm
Note that this device is pin compatible with the 13.5 W ×
2-channel LA4625, and allows end products differentiated
by their power rating to share the same printed circuit
board.
7.8
Two-Channel 20 W BTL Audio Power Amplifier
3113A-SIP14HZ
[LA4628]
4.0
1
1.94
0.5
4.6
5.2
8.4
11.8 R1.7
14.5max
27.0
20.0
14
0.4
1.6
3.56
2.2
Features
• Total output: 20 W + 20 W (at VCC = 13.5 V, RL = 4 Ω,
THD = 10%)
• High-fidelity design (fL < 10 Hz, fH = 130 kHz)
• Extremely low impulse noise levels
• An arbitrary amplifier startup time can be set up with
external components.
• Full complement of built-in protection circuits (includes
circuits that protect against shorting to VCC, shorting to
ground, load shorting, overvoltages and excessive
temperatures)
1.78
3.56
SANYO: SIP14HZ
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
92900RM (OT) No. 6632-1/8
LA4628
Allowable power dissipation, Pd max — W
Pd max — Ta
35
30
θjc=2.0°C/W
θf=3°C/W
25
θf=4°C/W
20
15
θf=7°C/W
θf=10°C/W
10
5
No Fin
0
–20
0
20
40
60
80
100
120
140
160
Ambient temperature, Ta —°C
Specifications
Maximum Ratings at Ta = 25°C
Parameter
Symbol
Conditions
Maximum supply voltage
VCC max
Maximum output current
IO peak
Per channel
Allowable power dissipation
Pd max
With an arbitrarily large heat sink
Ratings
No signal
Unit
24
V
4
A
32.5
W
Operating temperature
Topr
–20 to +85
°C
Storage temperature
Tstg
–40 to +150
°C
Ratings
Unit
Operating Conditions at Ta = 25°C
Parameter
Symbol
Recommended supply voltage
Conditions
VCC
13.5
V
Recommended load resistance range
RL op
4 to 8
Ω
Allowable operating supply voltage range
VCC op
9 to 20
V
Note: With VCC, RL, and the output level in ranges such that the Pdmax for the heat sink used is not exceeded.
Operating Characteristics at Ta = 25°C, VCC = 13.5 V, RL = 4 Ω, f = 1 kHz, Rg = 600 Ω
Parameter
Quiescent current
Symbol
ICCO
Conditions
With Rg = 0 and RL open.
Standby mode current drain
Ist
Standby mode (amplifier off), with no power supply capacitor.
Voltage gain
VG
VO = 0 dBm
Total harmonic distortion
Output power
Output offset voltage
THD
PO = 1 W, Filter = FLAT
PO1
VCC = 13.5 V, THD = 10%, RL = 4 Ω
PO2
VCC = 16.5 V, THD = 10%, RL = 4 Ω
VN offset
Output noise voltage
VNO
Ripple rejection ratio
SVRR
Channel separation
CH Sep
Input resistance
Standby pin applied voltage
Rg = 0
70
38
16
typ
Unit
max
130
250
mA
10
60
µA
40
42
dB
0.06
0.2
20
30
–300
Rg = 0, BPF = 20 Hz to 20 kHz
0.1
%
W
W
+300
mV
0.5
mV
Rg = 0, VR = 0 dBm, fR = 100 Hz
40
50
dB
Rg = 10 kΩ, VO = 0 dBm
50
60
dB
21
30
Amplifier on (applied through an external 10 kΩ resistor)
2.5
Ri
VST
Ratings
min
39
VCC
kΩ
V
No. 6632-2/8
LA4628
Equivalent Circuit Block Diagram
C2
100 µ/16 V
VCC
+
+
2200 µ
25 V
C5
2
14
OUTPUT PIN TO VCC
SHORT PROTECTOR
RIPPLE
FILTER
–OUT1
PREDRIVER
C1
+
1
+
–
2.2 µ
10 V
**
LOAD SHORT
PROTECTOR
IN
3
R1
ON 10 K
OFF
Standby
SW
POWER
GND1
12
**
PREDRIVER
PRE GND
13
POWER
11
POWER
THERMAL
SHUT DOWN
STANDBY
SW
OUTPUT PIN TO GND
SHORT PROTECTOR
+5 V
–OUT2
PREDRIVER
C4
+
9
POWER
IN2
**
6
+
–
2.2 µ
10 V
LOAD SHORT
PROTECTOR
IN
PREDRIVER
33 µ
10 V
10
8
**
–
C8 0.1 µ
R4
2.2
R5
2.2
C9 0.1 µ
+OUT2
RL
4Ω
+
OUTPUT PIN TO VCC
SHORT PROTECTOR
5
+
C3
POWER
GND2
POWER
POP NOISE
PREVENTION
CIRCUIT
+
+
**
(POLYESTER
FILM
CAPACITOR)
VCC
4
+OUT1
RL
4Ω
OUTPUT PIN TO GND
SHORT PROTECTOR
OVER VOLTAGE/
SURGE
BIAS
CIRCUIT
–
C6 0.1 µ
R2
2.2
R3
2.2
C7 0.1 µ
0.47 µ
10 V
7
C10
C3
Sets the amplifier starting time
(Approximately 0.6 seconds when 33 µF)
C10
Impulse noise reduction
(Note: The device’s ability to withstand shorting
to VCC or shorting to ground when VCC is around
16 V may be reduced as the value of this
capacitor is increased. We recommend 0.47 µF.)
No. 6632-3/8
LA4628
Pin Voltages
VCC = 13.5 V, with 5 V applied to STBY through a 10 kΩ resistor, RL = 4 Ω, Rg = 0
Pin No.
1
2
3
4
5
6
7
Pin
IN1
DC
PRE–GND
STBY
ON TIME
IN2
POP
Pin voltage
1.55 V
6.63 V
0V
3.21 V
2.32 V
1.55 V
2.07 V
Pin No.
8
9
10
11
12
13
14
Pin
+OUT2
–OUT2
PWR–GND2
+OUT1
PWR–GND1
–OUT1
VCC
Pin voltage
6.6 V
6.5 V
0V
6.5 V
0V
6.6 V
13.5 V
External Components
C1 and C4: Input capacitors. A value of 2.2 µF is recommended. Determine the polarity based on the DC potential of the
circuit connected directly to the LA4628 front end. Note that the low band response can be adjusted by
varying fL with the capacitors C1 and C4.
C2: Decoupling capacitor (ripple filter)
C3: Sets the amplifier starting time, which will be approximately 0.6 seconds for a value of 33 µF. The starting
time is proportional to the value of this capacitor, and can be set to any desired value.
C5: Power-supply capacitor
C6, C7, C8, and C9:
Oscillation prevention capacitors. Use polyester film capacitors (Mylar capacitors) with excellent
characteristics. (Note that the series resistors R2, R3, R4, and R5 are used in conjunction with these
capacitors to achieve stable amplifier operation.) A value of 0.1 µF is recommended.
C10: Impulse noise reduction capacitor. A value of 0.47 µF is recommended. Caution is required when selecting
the value for this capacitor, since increasing its value influences the operation of the circuits that protect
against shorting the amplifier output pins to VCC or to ground when higher VCC voltages (approximately
16 V or higher) are used.
R1: Standby switch current limiting resistor. A value of 10 kΩ is recommended when a voltage in the range 2.5
to 13.5 V will be applied as the standby switching voltage. Note that this resistor is not optional: it must be
included.
IC Internal Characteristics and Notes
1. Standby function
• Pin 4 is the standby switch. A voltage of 2.5 V or
higher must be applied through an external resistor to
turn the amplifier on.
• If a voltage of over 13.5 V will be applied as the
standby mode switching voltage, use the following
formula to determine the value of R1 so that the
current entering at pin 4 remains under 500 µA.
500 µA or lower
10 kΩ
4
R1
Applied standby
voltage
About 1.4 V
(2 VBE)
<applied voltage> – 1.4
R1 = —————————— – 10 kΩ
500 µA
Pin 4 Internal Equivalent Circuit
2. Muting function
• Pin 5 connects the capacitor that determines the starting time to prevent impulse noise. It can also be used to mute
the amplifier output by shorting pin 5 to ground. When this function is used, the recovery time depends on C3.
No. 6632-4/8
LA4628
3. Impulse noise improvements
• While the LA4628 achieves a low level of impulse noise, if even further reductions in impulse noise at power on/off
(and when switching into or out of standby mode) a 0.47 µF capacitor may be inserted between pin 7 and the PRE
GND pin (pin 3). (Pin 7 is the output amplifier bias pin. Since the ability to withstand shorting the output pins to
VCC or ground is reduced for supply voltages over 16 V if the pin 7 capacitance is large, we recommend a value of
0.47 µF or lower for this capacitor.)
4. Protection circuits
• Due to the system structure of the protection circuit for shorts to VCC or ground, if there is a DC resistance between
the amplifier output pins and ground, the protection circuit may operate when power is first applied and the
amplifier may fail to turn on. The basic design approach we recommend is not to adopt any designs in which there is
a DC resistance between the amplifier outputs and ground.
• The LA4628 includes a built-in thermal protection circuit to prevent the IC from being damaged or destroyed if
abnormally high temperatures occur. This thermal protection circuit gradually reduces the output if the IC junction
temperature (Tj) reaches the range 170 to 180°C due to inadequate heat sinking or other problem. If the temperature
falls, the amplifier will restart automatically.
• The LA4628 also includes other protection circuits. Use of these circuits also requires care during end product
design and testing.
5. Other notes
• The LA4628 is a BTL power amplifier. When testing this device, the ground systems for the test equipment
connected to IC inputs, and that for the test equipment connected to IC outputs, must be isolated. Do not use a
common ground.
Printed Circuit Pattern
(copper foil side)
GND
C5
14
1
LA4628
+
VCC
C1
IN1
+
+
C2
--OUT1
R2
C6
STB
GND
R1
+OUT1
R3
+
C3
+
C7
IN2
C4
+
C10
--OUT2
GND
R4
C8
R5
C9
+OUT2
ILA00349
No. 6632-5/8
LA4628
PO — VCC
40
35
30
25
RL
=
4Ω
20
RL
=6
Ω
15
10
1.0
7
5
3
2
0.1
7
5
3
2
5
0.01
1.0
0
6
7
8
9
10
11
12
13
14
15
16
Supply voltage, VCC — V
17
18
2
3
5 7 100
2
3
5 7 1k
ILA00335
f Response
0
THD = 3 %
15
Response — dB
Output power, PO — W
5 7 10
2
THD = 10 %
THD = 1 %
10
5
0
10
2 3
5 7 100
2 3
5 7 1k
2 3
5 7 10k
5 7100k
ILA00338
Total harmonic distortion, THD — %
3
2
1.0
7
5
3
2
10 kHz
0.1
7
5
100 Hz
1 kHz
3
2
0.01
0.1
2
3
5 7 1.0
2
3
5 7 10
2
Output power, PO — W
3
VCC = 13.5 V
RL = 4 Ω
PO = 1 W
3
2
1.0
7
5
3
2
0.1
7
5
3
2
0.01
10
2 3
5 7 100
2 3
5 7 1k
2 3
5 7 10k
Frequency, f — Hz
2 3
5 7100k
ILA00340
10
7
5
VCC = 13.5 V
RL = 4 Ω
Rg = 600 Ω
VO = 0 dBmMono
at 1 kHz
2 3
5 7 100
2 3
5 7 1k
2 3
5 7 10k
2 3
5 7100k
ILA00339
3
2
THD — PO
VCC = 13.5 V
RL = 6 Ω
Rg = 600 Ω
1.0
7
5
3
2
10 kHz
0.1
7
5
1 kHz
3
2
0.01
0.1
5 7 100
ILA00336
100 Hz
2
3
5 7 1.0
2
3
5 7 10
2
Output power, PO — W
THD — f
10
7
5
--6
Frequency, f — Hz
THD — PO
VCC =13.5 V
RL =4 Ω
Rg = 600 Ω
--4
--10
10
2 3
3
5 7 100
ILA00337
CH sep. — f
0
Channel separation, CHsep — dB
10
7
5
--2
--8
VCC = 13.5 V
RL = 4 Ω
Rg = 600 Ω
Frequency, f — Hz
Total harmonic distortion, THD — %
3
Input voltage, VIN — mVrms
20
Total harmonic distortion, THD — %
2
ILA00334
PO — f
25
PO — VIN
VCC = 13.5 V
RL = 4 Ω
f = 1 kHz
10
7
5
3
2
Output power, PO — W
Output power, PO — W
100
7
5
3
2
f = 1 kHz
Rg = 600 Ω
THD = 10 %
VCC = 13.5 V
RL = 4 Ω
Rg = 10 kΩ
VO = 0 dBm
--10
--20
--30
--40
--50
CH1 → 2
--60
CH2 → 1
--70
--80
--90
10
2 3
5 7 100
2 3
5 7 1k
2 3
5 7 10k
Frequency, f — Hz
2 3
5 7100k
ILA00341
No. 6632-6/8
LA4628
VNO — Rg
5
3
2
0.1
7
5
3
3
5 7 1k
2
3
5 7 10k
2
Signal source resistance, Rg — Ω
3
100 Hz OUT1
100 Hz OUT2
--60
3 kHz OUT2
3 kHz OUT1
--80
Calculated at SVRR = 20 log
--100
0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
Power supply ripple, VCCR — Vrms
1.8
2.0
5
9
11
13
15
)
5V
.
3
(1
8
17
19
21
Supply voltage, VCC — V
23
ILA00343
SVRR — fR
0
VCC = 13.5 V
RL = 4 Ω
Rg = 0
VCCR = 0 dBm
--20
--40
OUT1
--60
OUT2
--80
--100
10
2 3
5 7 100
2 3
5 7 1k
2 3
5 7 10k
2 3
5 7100k
ILA00344
Frequency, f — Hz
Power dissipation, Pd — W
Pd
7
Pd — PO (RL = 6 Ω)
RL = 6 Ω
Rg = 600 Ω
f = 1 kHz
Calculated at
Pd = (VCC × ICC) -- (2PO)
28
24
20
6.5
V)
1
d(
16
P
12
3.5
(1
Pd
V)
8
4
4
0
0.1
2
3
5 7 1.0
2
3
5 7 10
2
3
Output power, PO — W/ch
5 7 100
ILA00346
0
0.1
2
3
5 7 1.0
2
3
5 7 10
Output power, PO — W/ch
2
3
5 7 100
ILA00347
ICC — PO
RL = 4 / 6 Ω
Rg = 600 Ω
f = 1 kHz
R
6Ω
L
=4
Ω
4
L
=
3
R
Current drain, ICC — A
--80
32
12
5
OUT2
--60
ILA00345
V)
(1
6.5
16
Pd
Power dissipation, Pd — W
Pd — PO (RL = 4 Ω)
VO
VCCR
RL = 4 Ω
Rg = 600 Ω
f = 1 kHz
Calculated at
Pd = (VCC × ICC) -- (2PO)
20
6
OUT1
ILA00342
VCC = 13.5 V
RL = 4 Ω
Rg = 0
--40
24
--40
5 7 100k
SVRR — VCCR
--20
28
--20
--120
2
0
32
Rg = 0
fR = 100 Hz
VCCR = 0 dBm
--100
2
0.01
100
Ripple rejection ratio, SVRR — dB
Ripple rejection ratio, SVRR — dB
7
SVRR — VCC
0
VCC = 13.5 V
RL = 4 Ω
DIN AUDIO
Ripple rejection ratio, SVRR — dB
Output noise voltage, VNO — mVrms
1.0
2
1
0
0.1
2
3
5 7 1.0
2
3
5 7 10
Output power, PO — W/ch
2
3
5 7 100
ILA00348
No. 6632-7/8
LA4628
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, 2000. Specifications and information herein are
subject to change without notice.
PS No. 6632-8/8