SANYO LA4261 Datasheet
Ordering number: EN1321E
Monolithic Linear IC
LA4261
3.5 W 2-Channel AF Power Amplifier for
Home Stereos and Music Centers
Features
.
Minimum number of external parts required (No input
capacitor, bootstrap capacitor required).
.
High output: 3.5 W typ. ×2.
.
Soft clip, causing little harmonic disturbance to radios
(See page 8).
.
Small pop noise at the time of power switch ON/OFF
(See page 8).
.
Built-in protector against abnormal modes (Thermal
shutdown, overvoltage).
Package Dimensions
3018A-SIP10F
unit : mm
[LA4261]
SANYO : SIP10F
Specifications
Maximum Ratings at Ta = 25°C
Parameter Symbol Conditions Ratings Unit
Maximum supply voltage V
Maximum output current I
Allowable power dissipation Pd max
Operating temperature Topr –20 to +75 °C
Storage temperature Tstg –40 to +150 °C
max 25 V
CC
OP
1 channel 2.0 A
With heat sink
(see Pd – Ta characteristics)
7.5 W
Operating Conditions at Ta = 25°C
parameter Symbol Conditions Ratings Unit
Recommended supply voltage V
Recommended load resistance R
Operating supply voltage range V
CC
CC
L
op 9to24 V
16 V
8 Ω
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
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22897HA(II)/71093TS/2126KI/8064KI/8053KI,MT No.1321-1/8
LA4261
Operating Characteristics at Ta = 25°C, VCC=16V,RL=8Ω,f=1kHz, Rg = 600 Ω, (circuit 1)
Parameter Symbol Conditions min typ max Unit
Quiescent current I
CCO
Voltage gain VG 48 50 52 dB
Output power P
O
Total harmonic distortion THD P
Output noise voltage V
NO
THD = 10% 3.0 3.5 W
= 0.5 W 0.3 1.0 %
O
Rg=10kΩ, BW = 20 Hz to 20 kHz 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
Equivalent Circuit Block Diagram
46 62 mA
Infinite heat sink
2.5 No heat sink
Allowable power dissipation, Pd max – W
Pd max – Ta
Al heat sink
Tightening torque 39 Nccm
Silicon grease applied
Thermal resistance
between junction and
outside air θj-c 10°C/W
Ambient temperature, Ta – °C
– °C/W
f
Thermal resistance of heat sink, θ
θf–S
f
Al heat sink t = 1.5 mm
Area of heat sink, Sf–cm
2
No.1321-2/8
LA4261
Sample Application Circuit 1:
Recommended Circuit
Sample Printed Circuit Pattern
Sample Application Circuit 2:
Circuit with minimum number of external
parts
Unit (resistance: Ω, capacitance: F)
Unit (resistance: Ω, capacitance: F)
Description of External Parts
C1, C4 100 µF Feedback capacitor
C2, C3 330 pF Input short capacitor
C5, C7 470 µF Output capacitor
C6, C8 0.1 µF
polyester film
capacitor
C9 470 µF Power capacitor
C10 100 µF Ripple filter capacitor
R1, R2 100 kΩ Input bias resistor
R3, R4 3.3 Ω Resistor connected in series with oscillation blocking capacitor.
Decreasing the capacitance value lowers the low frequency response. Increasing the
capacitance value makes the starting time later.
Reduces the high frequency noise when the input impedance is increased. Not required
when the input impedance is decreased.
Decreasing the capacitance value causes insufficient power at low frequencies.
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.
Decreasing the capacitance value causes ripple to occur. Locating at a distance from the
IC or removing this capacitor may cause oscillation to occur.
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.
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.
Prevents phase shift attributable to the oscillation blocking capacitor so that oscillation is
hard to occur.
No.1321-3/8
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