Sanyo LA4261 3.5 w 2-channel af power amplifier for home stereos and music center Datasheet

Ordering number: EN1321E
Monolithic Linear IC
LA4261
3.5 W 2-Channel AF Power Amplifier for
Home Stereos and Music Centers
Features
Package Dimensions
. Minimum number of external parts required (No input
bootstrap capacitor required).
. capacitor,
High output: 3.5 W typ. ×2.
. Soft clip, causing little harmonic disturbance to radios
page 8).
. (See
Small pop noise at the time of power switch ON/OFF
page 8).
. (See
Built-in protector against abnormal modes (Thermal
3018A-SIP10F
unit : mm
[LA4261]
shutdown, overvoltage).
SANYO : SIP10F
Specifications
Maximum Ratings at Ta = 25°C
Parameter
Symbol
Maximum supply voltage
VCCmax
Maximum output current
IOP
Allowable power dissipation
Pd max
Conditions
Ratings
Unit
25
V
1 channel
2.0
A
With heat sink
(see Pd – Ta characteristics)
7.5
W
Operating temperature
Topr
–20 to +75
°C
Storage temperature
Tstg
–40 to +150
°C
Ratings
Unit
Operating Conditions at Ta = 25°C
parameter
Symbol
Conditions
Recommended supply voltage
VCC
16
V
Recommended load resistance
RL
8
Ω
Operating supply voltage range
VCC op
9 to 24
V
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN
22897HA(II)/71093TS/2126KI/8064KI/8053KI,MT No.1321-1/8
LA4261
Operating Characteristics at Ta = 25°C, VCC = 16 V, RL = 8 Ω, f = 1 kHz, Rg = 600 Ω, (circuit 1)
Parameter
Quiescent current
Symbol
Conditions
min
ICCO
Voltage gain
VG
Output power
PO
THD = 10%
Total harmonic distortion
THD
PO = 0.5 W
Output noise voltage
VNO
Rg = 10 kΩ, BW = 20 Hz to 20 kHz
typ
max
Unit
46
62
mA
48
50
52
dB
3.0
3.5
W
0.3
1.0
%
0.65
1.5
mV
Ripple rejection ratio
Rr
Rg = 0, Vr = 500 mV
40
50
dB
Crosstalk
CT
Rg = 10 kΩ
40
55
dB
Voltage gain difference
∆VG
1.5
dB
Pd max – Ta
Infinite heat sink
Al heat sink
Tightening torque 39 Nccm
Silicon grease applied
Thermal resistance
between junction and
outside air θj-c 10°C/W
2.5
No heat sink
Ambient temperature, Ta – °C
Thermal resistance of heat sink, θf – °C/W
Allowable power dissipation, Pd max – W
Equivalent Circuit Block Diagram
θf – Sf
Al heat sink t = 1.5 mm
Area of heat sink, Sf – cm2
No.1321-2/8
LA4261
Sample Application Circuit 1:
Sample Application Circuit 2:
Recommended Circuit
Circuit with minimum number of external
parts
Unit (resistance: Ω, capacitance: F)
Sample Printed Circuit Pattern
Unit (resistance: Ω, capacitance: F)
Description of External Parts
C1, C4
100 µF
Feedback capacitor
Decreasing the capacitance value lowers the low frequency response. Increasing the
capacitance value makes the starting time later.
C2, C3
330 pF
Input short capacitor
Reduces the high frequency noise when the input impedance is increased. Not required
when the input impedance is decreased.
C5, C7
470 µF
Output capacitor
Decreasing the capacitance value causes insufficient power at low frequencies.
C6, C8
0.1 µF
polyester film
capacitor
Oscillation blocking capacitor
Decreasing the capacitance value causes oscillation to occur easily. Use a polyester film
capacitor that is good in high frequency response and temperature characteristic. The use
of an electrolytic capacitor may cause oscillation to occur at low temperatures.
C9
470 µF
Power capacitor
Decreasing the capacitance value causes ripple to occur. Locating at a distance from the
IC or removing this capacitor may cause oscillation to occur.
C10
100 µF
Ripple filter capacitor
Decreasing the capacitance value excessively or removing this capacitor causes ripple to
occur. However, increasing the capacitance value does not always cause ripple to be
reduced. Decreasing the capacitance value makes the starting time earlier.
R1, R2
100 kΩ
Input bias resistor
Determines the bias (bias of GND potential) to be applied to the input pin and the input
impedance. Not required if variable resistors are used.
R3, R4
3.3 Ω
Resistor connected in series with oscillation blocking capacitor.
Prevents phase shift attributable to the oscillation blocking capacitor so that oscillation is
hard to occur.
No.1321-3/8
LA4261
Note for Changing Voltage Gain
Basically, the voltage gain can be reduced by adding external
resistors (RNF) in series with feedback capacitors C1, C4.
However, it should be noted that since there is no phase
compensation pin the frequency response is extended and
oscillation is liable to occur when the voltage gain is reduced.
The voltage gain must not be reduced to be less than 30 dB.
External Muting
If external muting is required, make the circuit as shown right.
In this case, the attack time, recovery time, and pop noise are
similar to those which occur at the time of power switch
ON/OFF.
Unit (resistance: Ω, capacitance: F)
Proper Cares in Using IC
. Maximum ratings
If the IC is used in the vicinity of the maximum ratings, even a slight variation in conditions may cause the maximum ratings to
be exceeded, thereby leading to breakdown. Allow an ample margin of variation for supply voltage, etc. and use the IC in the
range where the maximum ratings are not exceeded.
. Pin-to-pin short
If power is applied when the space between pins is shorted, breakdown or deterioration may occur. When mounting the IC on
the board or applying power, make sure that the space between pins is not shorted with solder, etc.
. When using in radios, allow a sufficient space between IC and bar antenna.
. Printed circuit pattern
When designing the printed circuit pattern, make the power supply, output, and ground lines thick and short and arrange the
pattern and parts so that no feedback loop is formed between input and output. Place power capacitor C9, oscillation blocking
capacitors C6, C8 as close to IC pins as possible to prevent oscillation from occurring. Refer to the sample printed circuit
pattern.
PO – VIN
Output power, PO – W
Total harmonic distortion, THD – %
THD – PO
Input voltage, VIN – mV
Output power, PO – W
No.1321-4/8
LA4261
THD – f
Output power, PO – W
Total harmonic distortion, THD – %
PO – f
Frequency, f – Hz
f Response
Response – dB
Output power, PO – W
Frequency, f – Hz
PO – VCC
Frequency, f – Hz
Pd – PO
Power dissipation, Pd – W
Current dissipation, ICC – mA
Supply voltage, VCC – V
ICC – PO
Output power, PO – W
ICCO – VCC
Output power, PO – W
Vpin – VCC
Quiescent
Pin voltage, Vpin – V
Quiescent current, ICCO – mA
Quiescent
Pin 3
Pin 1, 2, 4,
6, 7, 10
Pin 7, 10
Pin 2, 4
Pin 1, 6
Supply voltage, VCC – V
Supply voltage (pin 9), VCC – V
No.1321-5/8
LA4261
Vro – VCC
FILTER 20 Hz to 20 kHz
Output ripple voltage, Vro – mV
Output noise voltage, VNO – mV
VNO – Rg
Supply voltage, VCC – V
CT – f
Crosstalk, CT – dB
Output ripple voltage, Vro – mV
Signal source resistance, Rg – Ω
Vro – Vr
Ripple voltage, Vr – V
ICCO – Ta
Frequency, f – Hz
VG – RNF
Voltage gain, VG – dB
Quiescent current, ICCO – mA
Quiescent
External resistance, RNF – Ω
Ambient temperature, Ta – °C
f Response
Response – dB
Total harmonic distortion, THD – %
THD – f
Frequency, f – Hz
Frequency, f – Hz
No.1321-6/8
LA4261
VNO – VG
Output noise voltage, VNO – mV
Total harmonic distortion, THD – %
THD – VG
Voltage gain, VG – dB
Output ripple voltage, Vrp – mV
Voltage gain, VG – dB
Vrp – VG
FILTER 20 Hz to 20 kHz
Voltage gain, VG – dB
No.1321-7/8
LA4261
Pop Noise Waveform at The Time of Power Switch ON
(VCC = 16 V, RL = 8 Ω, quiescent)
Pop noise waveform
Pop Noise Waveform at The Time of Power Switch OFF
(VCC = 16 V, RL = 8 Ω, quiescent)
Pop noise waveform
Middle point rise
waveform
Middle point fall
waveform
f = 1 kHz Clip waveform
(VCC = 16 V, RL = 8 Ω, THD = 5%)
f = 10 kHz Clip waveform
(VCC = 16 V, RL = 8 Ω, THD = 5%)
No products described or contained herein are intended for use in surgical implants, life-support systems, 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 loss.
Anyone purchasing any products described or contained herein for an above-mentioned use shall:
1 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:
2 Not impose any responsibility 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.
This catalog provides information as of February 1997. Specifications and information herein are subject to change without notice.
No.1321-8/8
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