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Ordering number : ENA0078
LA42352
Monolithic Linear IC
5W 2-Channel AF Power Amplifier
With DC Volume Control
Overview
LA42352 is 5W 2-channel AF power amplifier with DC volume control intended for televisions.
LA42000 series is power IC which made Pin compatible possible altogether in 3 to 15W. They consist of four kinds of power
ICs. (mono, stereo, mono with volume function, stereo with volume function.). They realized PCB layout communalization
of an audio power block of TV.
PO
LA42051 5W
LA42052 5W
LA42351 5W
LA42352 5W
LA42071 7W
LA42072 7W
LA42152 15W
Channel
Mono Stereo
°
°
°
°
°
°
°
°
Volume
°
Feature
• PO 5W×2ch (VCC = 18V, RL = 8Ω, THD = 10%)
• Built-in DC Volume Control.
• Built-in Standby function.
• Built-in overheat protection.
Any and all SANYO Semiconductor 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 Semiconductor representative
nearest you before using any SANYO Semiconductor products described or contained herein in such
applications.
SANYO Semiconductor 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 Semiconductor
products described or contained herein.
92706 / 83005 MS PC B8-9060 No.A0078-1/9
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LA42352
Specitications
Maximum Ratings at Ta = 25 °C
Parameter Symbol Conditions Ratings Unit
Maximum supply voltage VCC max No signal 24 V
Allowable power dissipation Pd max Infinite heat sink 15 W
Maximum junction temperature Tj max 150 °C
Thermal resistance θjc 3 °C/W
Operating temperature Topr -25 to +75 °C
Storage temperature Tstg -40 to +150 °C
Operating Conditions at Ta = 25 °C
Parameter Symbol Conditions Ratings Unit
Recommended supply voltage VCC 18 V
Recommended load resistance RL 8 Ω
Allowable operating voltage range VCC op 10 to 22 V
Operating Characteristics at Ta = 25°C, VCC = 18V, RL = 8Ω, Volume = 5V, f = 1kHz, Rg = 600Ω
Parameter Symbol Conditions
Standby current I
Quiescent current I
Output power PO THD = 10% 4 5 W
Total harmonic distortion THD PO = 1W 0.1 0.8 %
Voltage gain VG VO = 0dBm 32.5 34.5 36.5 dB
Output noise voltage VNO Rg = 0, Volume = 0V,
Volume Attenuation Att VIN = 100mV, Vcont = 0V, with 1k-BPF 70 80 dB
Channel separation Sep. Rg = 10kΩ, VO = 0dBm 48 55 dB
(The Pin 5 voltage)
Input resistance Ri 14 20 26 kΩ
Amplifier off 1 10 µA
STB
Rg = 0, Volume = 0V 35 65 130 mA
CCO
BPF = 20Hz to 20kHz
V
-H Amplifier on 2.5 10 V Standby control voltage
STB
V
-L Amplifier off 0 0.5 V
STB
min typ max
*0dBm = 1mW (600Ω) = 774.6mVrms
Package Dimensions
unit : mm
3107B
Ratings
0.13 0.4 mVrms
Unit
No.A0078-2/9
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Block Diagram
p
p
LA42352
IN1
Volume 1
Pre
GND
IN2
Volume 2
2
13
3
4
6
Ri =
20kΩ
Ri =
20kΩ
ut amplifier
In
ut amplifier
In
Standby
5
Thermal protection
circuit
VCC
7
Output amplifier
Output amplifier
12
11
10
8
OUT1
NF1
Power
GND
OUT2
Sample Application Circuit
C3
47µF
/25V
Ripple
Filter
1
+
IN1
2
+
1.0µF
/10V
PRE
GND
3
C1
IN2
4
+
1.0µF
/10V
C2
STB
5
CPU
LA42352
Vol 2
R3
10k
Ω
Ripple Filter
6
+5V
Block
1
Ripple
Filter
V
CC
7
1000µF
0.1µF
C4
/25V
+
C7
R1
2.2
OUT2
Ω
8
C9
47µF
/16V
+
C5
470µF
/16V
NF2
9
+
PWR
GND
10
RLR
9
NF2
NF1
11
+
470µF
L
C10
47µF
/16V
C6
/16V
OUT1
12
+
C8
0.1µF
R2
2.2
Ω
Vol 1
13
+5V
No.A0078-3/9
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LA42352
Pin Descriptions
Pin No Symbol
1
2
4
3 PRE_GND 0 • Pre GND pin
5
6
13
7 VCC 18 • Power supply
RF 17.6 • Ripple filter reference
IN1
IN2
STB 0 to 5V
Vol 2
Vol 1
Pin Voltage
VCC = 18V
4.4 • Input pin
• Standby pin
(Input voltage)
0 to 5V
(Input voltage)
• Control Volume
Equivalent Circuit Description
• The standby function is on when this
pin at ground level
Continued on next page.
No.A0078-4/9
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LA42352
Continued from preceding page.
Pin No Symbol
8
12
9
10
10 PWR_GND 0 • Power GND pin
OUT2
OUT1
NF2
NF1
Description of External parts
C1, C2 : Input capacitors. A value of 1.0µF is recommended for capacitors. Note that the low-frequency area
characteristics can be adjusted by changing fL.
C3 : Ripple filter capacitor. A value of 47µF is recommended for capacitors. Decreasing the capacitance value
excessively or removing this capacitor causes ripple to occur. However, increasing the capacitance value
does not always cause ripple to reduced. Decreasing the capacitance value makes the starting time earlier.
C4 : Power capacitor.
C5, C6 : Output capacitors. A value of 470µF is recommended for capacitors.
C7, C8 : Oscillation blocking capacitor. Use a polyester film capacitor that is good in high frequency response and
temperature characteristic.
C9, C10 : Feedback capacitor. A value of 47µF is recommended for capacitors. Decreasing the capacitance value
lowers the low frequency response. Increasin g the capacitance value makes the starting time later.
R1, R2 : Resistor connected in series with oscillation blocking capacitor. Preven ts phase shift attributable to the
oscillation blocking capacitor so that oscillation is hard to occur.
R3 : Standby switch current limiting resistor. A value of 10kΩ is recommended for resistance (when the applied
voltage for the standby switch is 3V to 10V). This resistor cannot be removed.
Pin Voltage
VCC = 18V
8.9 • Output pin
8.8 • Negative feedback pin at Power
Equivalent Circuit Description
amplifier
• Connect NF capacitor
No.A0078-5/9
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LA42352
Features of IC Inside and Usage Note
Standby function
• Pin 5 is the standby switch pin. The amplifier is turned on by applying approximately 3V or more to this pin th roug h an
external resistor (R3).
• If voltage in excess of 10V is to be applied to the standby switch, calculate the value of R3 using the following formula
so that the current flowing into pin 5 is 500µA or less:
(Applied voltage − 2VBE (≈1.4V))
R3 =
Protector
• In order to prevent damage or degradation which may be caused by abnormally heated IC, the LA42352 has a thermal
shutdown protector. Accordingly, if the IC junction temperature (Tj) climbs to around 160°C due to inadequate heat
dissipation, the thermal shutdown protector will operate to control the output gradually into attenuation.
500µA
− 15kΩ
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LA42352
No.A0078-7/9
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LA42352
No.A0078-8/9
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LA42352
Specifications of any and all SANYO Semi conductor p roducts 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 S emiconductor 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 Semiconductor products (including technical data,services) described
or contained herein are controlled under any of applicable local export control laws and regulations, such
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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 Semiconductor 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. SANY O Semiconductor 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 August, 2005. Specifications and information herein are subject
to change without notice.
No.A0078-9/9
PS
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