Page 1
Ordering number : EN*5716
Preliminary
Monolithic Linear IC
LA4728
2-Channel BTL Power Amplifier (35 W+35 W)
with Standby Switch for Car Stereos
Overview
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.
Features
⋅ High power: supports total output of 35 W+35 W. [EIAJ
power] (V
=14.4 V, THD=30 %, RL=4 Ω)
CC
⋅ 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 support-
ed)
⋅ 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.
Package Dimensions
unit: mm
3113A-SIP14HZ
[LA4728]
SANYO: SIP14HZ
Specifications
Maximum Ratings at Ta = 25 ˚C
Parameter Symbol Conditions Ratings Unit
Maximum supply voltage V
Surge supply voltage V
Maximum output current I
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
Recommended Conditions at Ta = 25 ˚C
Parameter Symbol Conditions Ratings Unit
Recommended supply voltage V
Operating voltage range V
Recommended load resistance R
max 18 V
CC
surge f ≤ 0.2 s, single giant pulse 50 V
CC
peak Per channel 3.5 A
O
CC
op Range where Pd max is not exceeded 9 to 16 V
CC
op 4 Ω
L
13.2 V
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
Page 2
LA4728
Operating Characteristics Ta = 25 ˚C, VCC = 13.2 V, RL = 4 kΩ, f = 1 kHz, Rg = 600 Ω
Parameter Symbol Conditions
Quiescent current I
Standby current I
Voltage gain VG 38 40 42 dB
Total harmonic distortion THD P
Output power
Output offset voltage V
Output noise voltage V
Ripple rejection ratio SVRR Rg=0, f
Channel separation Chsep Rg=10 kΩ, V
Input resistance Ri 21 30 39 kΩ
Standby pin applied voltage Vst Amp on, applied through 10 kΩ 2.5 V
35
Arbitrarily large heat sink
32
30
θf=3˚C/W
25
θf=4˚C/W
20.8
20
Pd max — Ta
N offset
Rg=0 70 125 250 mA
CCO
ST
=1 W 0.06 0.2 %
O
RL=4 Ω, THD=10 %, VCC=13.2 V 16 20 W
P
O1
P
RL=4 Ω, THD=10 %, VCC=14.4 V 25 W
O2
P
RL=4 Ω, THD=30 %, VCC=14.4 V 35 W
O3
Rg=0 –300 +300 mV
Rg=0, B.P.F.=20 Hz to 20 kHz 0.1 0.5 mVrms
NO
=100 Hz, VR=0 dBm 40 50 dB
R
=0 dBm 50 60 dB
O
θjc=2.0˚C/W
min typ max
Ratings
10 60 µA
CC
Unit
V
15
θf=7˚C/W
13.9
θf=10˚C/W
10.4
10
5
No fin
3.1
Allowable power dissipation, Pd max — W
0
–20 0 20 40 140 16060 80 100 120
Ambient temperature, Ta — ˚C
No.5716-2/3
Page 3
Block Diagram and Sample Application Circuit
100 µF/16V
+
LA4728
C5
V
+
2200 µF
CC
2
Ripple
filter
Predriver Power
++
ONOFF
+
5V
C1
2.2 µF/6V
R1
10kΩ
C4
IN2
2.2 µF/6V
1
3
4
6
+
IN
–
Predriver Power
BIAS
circuit
Standby
SW
Predriver Power
+
IN
–
Predriver Power
Pop noise
prevention
circuit
Load short
protector
Overvoltage/
surge protector
Thermal
shutdown
Load short
protector
V
CC
14
Output pin-to-V
short protector
Output pin-to-GND
short protector
Output pin-to-GND
short protector
Output pin-to-V
short protector
CC
Power
GND2
CC
OUT1
13
C6
**
R2
2.2Ω
12
R3
2.2Ω
**
C7 0.1 µF
11
OUT1
**
(Polyester film
capacitor)
OUT2
9
C8 0.1 µF
**
R4
2.2Ω
10
R5
2.2Ω
**
C9 0.1 µF
8
OUT2
–
0.1 µF
+
–
+
R
4Ω
R
4Ω
L
L
5
+
33 µF/6V 0.47 µF/6VC3 C10
No products described or contained herein are intended for use in surgical implants, life-support systems,
7
+
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.
A07431
This catalog provides information as of March, 1997. Specifications and information herein are subject to
change without notice.
No.5716-3/3
Loading...