*
Ordering number : EN 5716
Monolithic Linear IC
LA4728
2-Channel BTL Power Amplifier (35 W+35 W)
with Standby Switch for Car Stereos
Preliminary
Overview
Package Dimensions
The LA4728 is a BTL two-channel power IC for car
audios developed in pursuit of excellent sound quality.
Low-region frequency characteristics have been improved
through the use of a new NF capacitorless circuit, and
crosstalk which causes “muddy” sound has been reduced
by improving both circuit and pattern layout. As a result
the LA4728 provides powerful bass and clear treble.
unit: mm
3113A-SIP14HZ
[LA4728]
Features
⋅ High power: supports total output of 35 W+35 W. [EIAJ
power] (VCC=14.4 V, THD=30 %, RL=4 Ω)
⋅ Less pop noise.
⋅ Designed for excellent sound quality.
(fL<10 Hz, fH=130 kHz)
⋅ Any rise time settable by an external capacitor.
⋅ Standby switch circuit on chip. (microcontroller supported)
⋅ Various protectors on chip.
(output-to-ground short/ output-to-VCC short/ load
short/ overvoltage/ thermal shutdown circuit)
⋅ The LA4728 is pin-compatible with the LA4725.
SANYO: SIP14HZ
Specifications
Maximum Ratings at Ta = 25 ˚C
Parameter
Maximum supply voltage
Surge supply voltage
Symbol
Conditions
VCC max
VCC surge f ≤ 0.2 s, single giant pulse
Ratings
Unit
18
V
50
V
Maximum output current
IO peak
Per channel
3.5
A
Allowable power disspation
Pd max
With arbitrarily large heat sink
32
W
Operating temperature
Topr
–35 to +85
˚C
Storage temperature
Tstg
–40 to +150
˚C
Ratings
Unit
Recommended Conditions at Ta = 25 ˚C
Parameter
Recommended supply voltage
Operating voltage range
Recommended load resistance
Symbol
Conditions
VCC
VCC op
RL op
Range where Pd max is not exceeded
13.2
V
9 to 16
V
4
Ω
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN
32497RM(KOTO) No.5716-1/3
LA4728
Operating Characteristics Ta = 25 ˚C, VCC = 13.2 V, RL = 4 kΩ, f = 1 kHz, Rg = 600 Ω
Parameter
Symbol
Quiescent current
Conditions
ICCO
Standby current
IST
Voltage gain
VG
Total harmonic distortion
Output power
Output offset voltage
Rg=0
Ratings
min
70
38
THD
PO=1 W
PO1
RL=4 Ω, THD=10 %, VCC=13.2 V
PO2
PO3
VN offset
max
125
250
mA
10
60
µA
40
42
dB
0.06
0.2
W
RL=4 Ω, THD=10 %, VCC=14.4 V
25
W
RL=4 Ω, THD=30 %, VCC=14.4 V
35
–300
VNO
Rg=0, B.P.F.=20 Hz to 20 kHz
Ripple rejection ratio
SVRR
Rg=0, fR=100 Hz, VR=0 dBm
40
50
Channel separation
Chsep
Rg=10 kΩ, VO=0 dBm
50
60
21
30
Standby pin applied voltage
Vst
Allowable power dissipation, Pd max — W
Ri
35
32
30
25
20.8
20
15
13.9
10.4
10
5
3.1
Amp on, applied through 10 kΩ
0.1
2.5
W
+300
Output noise voltage
Input resistance
%
20
Rg=0
16
Unit
typ
0.5
mV
mVrms
dB
dB
39
VCC
kΩ
V
Pd max — Ta
Arbitrarily large heat sink
θjc=2.0˚C/W
θf=3˚C/W
θf=4˚C/W
θf=7˚C/W
θf=10˚C/W
No fin
0
–20
0
20
40
60
80
100
120
140
160
Ambient temperature, Ta — ˚C
No.5716-2/3
LA4728
Block Diagram and Sample Application Circuit
100 µF/16V
+
VCC
+
C5
2
14
Output pin-to-VCC
short protector
Ripple
filter
Predriver
13
Power
**
+
C1
+
1
2.2 µF/6V
–
Load short
protector
IN
Predriver
12
**
11
Power
OUT1
BIAS
circuit
R1
OFF ON 10kΩ
4
Overvoltage/
surge protector
Standby
SW
Thermal
shutdown
VCC
Predriver
Output pin-to-GND
short protector
OUT2
9
Power
+
+
–
Load short
protector
IN
Power
10
GND2
**
Predriver
8
Power
–
C8 0.1 µF
R4
2.2Ω
R5
2.2Ω
C9 0.1 µF
OUT2
RL
4Ω
+
Output pin-to-VCC
short protector
Pop noise
prevention
circuit
5
+
33 µF/6V
+
**
(Polyester film
capacitor)
**
6
2.2 µF/6V
RL
4Ω
Output pin-to-GND
short protector
+5V
C4
IN2
–
C6 0.1 µF
R2
2.2Ω
R3
2.2Ω
C7 0.1 µF
OUT1
3
2200 µF
7
+
C3
0.47 µF/6V
C10
A07431
No products described or contained herein are intended for use in surgical implants, life-support systems,
aerospace equipment, nuclear power control systems, vehicles, disaster/crime-prevention equipment and
the like, the failure of which may directly or indirectly cause injury, death or property lose.
Anyone purchasing any products described or contained herein for an above-mentioned use shall:
Accept full responsibility and indemnify and defend SANYO ELECTRIC CO., LTD., its affiliates,
subsidiaries and distributors and all their officers and employees, jointly and severally, against any
and all claims and litigation and all damages, cost and expenses associated with such use:
Not impose any responsibilty for any fault or negligence which may be cited in any such claim or
litigation on SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors or any of
their officers and employees jointly or severally.
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 March, 1997. Specifications and information herein are subject to
change without notice.
No.5716-3/3
This datasheet has been download from:
www.datasheetcatalog.com
Datasheets for electronics components.