Sanyo LA42071 Monolithic linear ic 5w 2-channel af power amplifier with dc volume control Datasheet

Ordering number : ENA0078
Monolithic Linear IC
LA42352
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.
Channel
PO
Mono
LA42051
5W
LA42052
5W
LA42351
5W
LA42352
5W
LA42071
7W
LA42072
7W
LA42152
15W
°
°
°
Volume
Stereo
°
°
°
°
°
°
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
LA42352
Specitications
Maximum Ratings at Ta = 25 °C
Parameter
Symbol
Maximum supply voltage
VCC max
Allowable power dissipation
Pd max
Maximum junction temperature
Tj max
Conditions
Ratings
Unit
No signal
24
Infinite heat sink
15
W
150
°C
θjc
Thermal resistance
V
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
10 to 22
V
Allowable operating voltage range
VCC op
Operating Characteristics at Ta = 25°C, VCC = 18V, RL = 8Ω, Volume = 5V, f = 1kHz, Rg = 600Ω
Parameter
Symbol
Ratings
Conditions
min
Standby current
ISTB
typ
1
10
µA
35
65
130
mA
4
5
Amplifier off
Quiescent current
ICCO
Rg = 0, Volume = 0V
Output power
PO
THD = 10%
Total harmonic distortion
THD
PO = 1W
Unit
max
32.5
W
0.1
0.8
%
34.5
36.5
dB
0.13
0.4
mVrms
Voltage gain
VG
VO = 0dBm
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
Standby control voltage
VSTB-H
Amplifier on
2.5
10
V
(The Pin 5 voltage)
VSTB-L
Amplifier off
0
0.5
V
Input resistance
Ri
26
kΩ
BPF = 20Hz to 20kHz
14
20
*0dBm = 1mW (600Ω) = 774.6mVrms
Package Dimensions
unit : mm
3107B
No.A0078-2/9
LA42352
Block Diagram
Standby
VCC
5
7
Ri =
20kΩ
Input amplifier
IN1
Output amplifier
2
12 OUT1
Volume 1 13
Pre
GND
3
11 NF1
Thermal protection
circuit
Ri =
20kΩ
10
Power
GND
8
OUT2
9
NF2
Input amplifier
IN2
Volume 2
Output amplifier
4
6
Ripple Filter
Block
1
Ripple
Filter
Sample Application Circuit
LA42352
Ripple
Filter
IN1
PRE
GND
IN2
STB
Vol 2
1
2
3
4
5
6
C3 +
47µF
/25V
VCC
OUT2
NF2
PWR
GND
NF1
OUT1
Vol 1
7
8
9
10
11
12
13
+5V
+
C1
1.0µF
/10V
+
C2
1.0µF
/10V
R3
10kΩ
C4
1000µF
/25V
+
C9 +
47µF
/16V
+
+
CPU
C7
0.1µF
R1
2.2Ω
C5
470µF
/16V
+5V
C10
47µF
/16V
+
RL
RL
C6
470µF
/16V
C8
0.1µF
R2
2.2Ω
No.A0078-3/9
LA42352
Pin Descriptions
Pin No
Symbol
Pin Voltage
Equivalent Circuit
Description
1
RF
VCC = 18V
17.6
2
IN1
4.4
4
IN2
3
PRE_GND
0
• Pre GND pin
5
STB
0 to 5V
• Standby pin
(Input voltage)
• Ripple filter reference
• Input pin
• The standby function is on when this
pin at ground level
6
Vol 2
0 to 5V
13
Vol 1
(Input voltage)
7
VCC
18
• Control Volume
• Power supply
Continued on next page.
No.A0078-4/9
LA42352
Continued from preceding page.
Pin No
Symbol
8
OUT2
12
OUT1
9
NF2
10
NF1
Pin Voltage
VCC = 18V
8.9
8.8
Equivalent Circuit
Description
• Output pin
• Negative feedback pin at Power
amplifier
• Connect NF capacitor
10
PWR_GND
0
• Power GND pin
Description of External parts
C1, C2
C3
C4
C5, C6
C7, C8
C9, C10
R1, R2
R3
: Input capacitors. A value of 1.0µF is recommended for capacitors. Note that the low-frequency area
characteristics can be adjusted by changing fL.
: 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.
: Power capacitor.
: Output capacitors. A value of 470µF is recommended for capacitors.
: Oscillation blocking capacitor. Use a polyester film capacitor that is good in high frequency response and
temperature characteristic.
: Feedback capacitor. A value of 47µF is recommended for capacitors. Decreasing the capacitance value
lowers the low frequency response. Increasing the capacitance value makes the starting time later.
: Resistor connected in series with oscillation blocking capacitor. Prevents phase shift attributable to the
oscillation blocking capacitor so that oscillation is hard to occur.
: 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.
No.A0078-5/9
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 through 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:
R3 =
(Applied voltage − 2VBE (≈1.4V))
− 15kΩ
500µA
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.
No.A0078-6/9
LA42352
No.A0078-7/9
LA42352
No.A0078-8/9
LA42352
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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
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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
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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. SANYO Semiconductor believes information herein is accurate and
reliable, but no guarantees are made or implied regarding its use or any infringements of intellectual
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This catalog provides information as of August, 2005. Specifications and information herein are subject
to change without notice.
PS No.A0078-9/9
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