Ordering number : ENA0078
Monolithic Linear IC
LA42352
Overview
5W 2-Channel AF Power Amplifier
With DC Volume Control
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
Mono
LA42051
LA42052
LA42351
LA42352
LA42071
LA42072
LA42152
5W
5W
5W
5W
7W
7W
15W
Channel
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
Maximum supply voltage
Allowable power dissipation
Maximum junction temperature
Thermal resistance
Operating temperature
Storage temperature
Symbol
VCC max
Pd max
Tj max
θjc
Topr
Tstg
No signal
Infinite heat sink
Conditions
Ratings
24
15
150
3
-25 to +75
-40 to +150
Unit
V
W
°C
°C/W
°C
°C
Operating Conditions
at Ta = 25
°C
Parameter
Recommended supply voltage
Recommended load resistance
Allowable operating voltage range
Symbol
VCC
RL
VCC op
Conditions
Ratings
18
8
10 to 22
Unit
V
Ω
V
Operating Characteristics
at Ta = 25°C, VCC = 18V, RL = 8Ω, Volume = 5V, f = 1kHz, Rg = 600Ω
Parameter
Standby current
Quiescent current
Output power
Total harmonic distortion
Voltage gain
Output noise voltage
Volume Attenuation
Channel separation
Standby control voltage
(The Pin 5 voltage)
Input resistance
Symbol
ISTB
ICCO
PO
THD
VG
VNO
Att
Sep.
VSTB-H
VSTB-L
Ri
Amplifier off
Rg = 0, Volume = 0V
THD = 10%
PO = 1W
VO = 0dBm
Rg = 0, Volume = 0V,
BPF = 20Hz to 20kHz
VIN = 100mV, Vcont = 0V, with 1k-BPF
Rg = 10kΩ, VO = 0dBm
Amplifier on
Amplifier off
70
48
2.5
0
14
20
80
55
10
0.5
26
dB
dB
V
V
kΩ
32.5
35
4
Conditions
min
Ratings
typ
1
65
5
0.1
34.5
0.13
0.8
36.5
0.4
max
10
130
µA
mA
W
%
dB
mVrms
Unit
*0dBm = 1mW (600Ω) = 774.6mVrms
Package Dimensions
unit : mm
3107B
No.A0078-2/9
LA42352
Block Diagram
Standby
5
VCC
7
Ri =
20kΩ
Input amplifier
IN1
2
Output amplifier
12 OUT1
Volume 1 13
Pre
GND
3
Thermal protection
circuit
Ri =
20kΩ
Input amplifier
11 NF1
10
Output amplifier
8
Power
GND
IN2
4
OUT2
Volume 2
6
9
Ripple Filter
Block
1
Ripple
Filter
NF2
Sample Application Circuit
LA42352
Ripple
Filter
1
C3 +
47µF
/25V
PRE
GND
3
PWR
GND
10
IN1
2
IN2
4
STB
5
Vol 2
6
VCC
7
OUT2
8
NF2
9
NF1
11
+
OUT1
12
Vol 1
13
+5V
+
C1
1.0µF
/10V
+
C2
1.0µF
/10V
C4
+5V
1000µF
/25V
+
R3
10kΩ
C9 +
47µF
/16V
C10
47µF
/16V
+
CPU
C7
0.1µF
R1
2.2Ω
C5
470µF
/16V
+
C6
470µF
/16V
C8
0.1µF
R2
2.2Ω
RL
RL
No.A0078-3/9
LA42352
Pin Descriptions
Pin No
1
Symbol
RF
Pin Voltage
VCC = 18V
17.6
Equivalent Circuit
Description
•
Ripple filter reference
2
4
IN1
IN2
4.4
•
Input pin
3
5
PRE_GND
STB
0
0 to 5V
(Input voltage)
•
Pre GND pin
•
Standby pin
•
The standby function is on when this
pin at ground level
6
13
Vol 2
Vol 1
0 to 5V
(Input voltage)
•
Control Volume
7
VCC
18
•
Power supply
Continued on next page.
No.A0078-4/9
LA42352
Continued from preceding page.
Pin No
8
12
Symbol
OUT2
OUT1
Pin Voltage
VCC = 18V
8.9
Equivalent Circuit
•
Output pin
Description
9
10
NF2
NF1
8.8
•
Negative feedback pin at Power
amplifier
•
Connect NF capacitor
10
PWR_GND
0
•
Power GND pin
Description of External parts
C1, C2
C3
: 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.
C4
C5, C6
C7, C8
C9, C10
R1, R2
R3
No.A0078-5/9