SANYO LA4278 Datasheet
Ordering number: ENN7096
SANYO Electric Co.,Ltd. Semiconductor Company
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
Monolithic Linear IC
LA4278
10 W 2-Channel Power Amplifier
Overview
The LA4278 is a 10 W 2-channel power amplifier intended
for televisions.
This IC has a series of pin compatible monaural and 2channel power amplifiers, thus allows the end product to
use a common circuit boad.
Features
• Television audio output.
• Pin compatible with the LA4266 (3 W)/LA4267 (5 W)/
4268 (10 W) and the LA4276 (3 W × 2)/4277(5 W × 2).
• Package: SIP-10H (2.54 mm pitch, straight pins).
• Thermal protection circuit and overvoltage protection
circuit on chip.
• Output power: 10 W × 2(VCC = 28 V/RL = 8 Ω).
Specifications
Maximum Ratings at Ta = 25°C
Package Dimensions
unit: mm
3024A-SIP10H
[LA4278]
27.0
20.0
8.4
7.0
1.4
0.5
2.54
R1.7
101
2.07
SANYO: SIP10H
11.8
13.2max
6.0
1.0 min
4.0
0.4
2.0
Parameter Symbol Conditions Ratings Unit
Maximum supply voltage V
Maximum output current IO peak Per channel 2.5 A
Allowable power dissipation Pd max Infinite heat sink 25.0 W
Thermal resistance
Operating temperature Topr –20 to +75 °C
Storage temperature Tstg –40 to +150 °C
CC
θ
j-c 3.0 °C/W
Rg = 0 35 V
Operating Conditions at Ta = 25°C
Parameter Symbol Conditions Ratings Unit
Recommended supply voltage V
Load resistance R
Operating supply voltage range VCC op Range does not exceed Pd 10 to 34 V
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.
CC
L
28 V
8 Ω
41202RM (II) No. 7096-1/6
LA4278
Operating Characteristics at Ta = 25°C, VCC = 28 V, RL = 8 Ω, f = 1 kHz, Rg = 600 Ω, with specified board, in
specified circuit
Parameter Symbol Conditions
Quiescent current I
CCO
Rg = 0 55 80 mA
Voltage gain VG VO = 0 dBm 38 40 42 dB
Total harmonic distortion THD PO = 0.5 W 0.1 0.8 %
Output noise voltage V
Output power P
NO
O
Rg = 10 kΩ, BPF = 20 Hz to 20 kHz 0.25 1.0 mV
THD = 10 % 8.0 10 W
Ripple rejection SVRR Rg = 0, fr = 100 Hz, Vr = 0.5 Vrms 45 55 dB
Crosstalk CT Rg = 10 kΩ, VO = 0 dBm 40 55 dB
Ratings
min typ max
Unit
28
Infinite heat sink
25
24
20
16
100 × 100 × 1.5 mm
12.5
12
50 × 50 × 1.5 mm
8
7
No heat sink
4
3.2
Allowable power dissipation, Pd max — W
0
--20
Pd max – Ta
3
200 406080
Ambient temperature, Ta — ¡C
Pin Assignment and Equivalent Circuit Diagram
30 kΩ300 Ω
25
3
7.5
4.2
1.92
AI heat sink
Mounting
torque 39N¥cm
Flat washer
Silicone grease
applied
ILA00880
160140120100
30 kΩ
NF1
1 2 3 4
+
C1
100 µF
IN1
C2
Filter
PRE GND
IN2
NF2
300 Ω
OUT2
Power GND
V
CC
OUT1
5 6 7 8910
+
C3
100 µF
R1
750 Ω
4.7 µF
+
C4
+
C5
4.7 µF
+
100 µF
C6
1000 µF
R
L
C7
R2
0.1 µF
1.0 Ω
+
C8
+
1000 µF
C9
R
L
C10
R3
0.1 µF
1.0 Ω
1000 µF
* For Muting, add a resistor between pin 3 and GND. 750 Ω for the LA4266/67/68, 200 Ω for the LA4276/77.
No. 7096-2/6
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