EN750 D

Ordering number : EN750F
LA4440
Monolithic Linear IC
6W 2-Channel, Bridge 19W(typ)
Power Amplifier
Features
http://onsemi.com
Package Dimensions
 Built-in 2 channels (dual) enabling use in stereo and bridge
amplifier applications.
Dual
: 6W2 (typ)
Bridge : 19W (typ)
 Minimum number of external parts required.
 Small pop noise at the time of power supply ON/OFF and
good starting balance.
 Good ripple rejection : 46dB (typ)
 Good channel separation.
 Small residual noise (Rg=0).
 Low distortion over a wide range from low frequencies to
high frequencies.
 Easy to design radiator fin.
 Built-in audio muting function.
 Built-in protectors.
a. Thermal protector
b. Overvoltage, surge voltage protector
c. Pin-to-pin short protector
unit : mm
Specifications
Absolute Maximum Ratings at Ta = 25C
Parameter
Symbol
Conditions
Ratings
unit
Maximum supply voltage
VCC max1
VCC max2
Quiescent (t=30s)
25
V
Operating
18
V
Surge supply voltage
VCC (surge)
t ≤ 0.2s
50
V
Allowable power dissipation
Pd max
Tc=75°C, See Pd max – Ta characteristic
15
W
Thermal resistance
j-c
Junction-to-case
3
°C/W
Operating temperature
Topr
–20 to +75
C
Storage temperature
Tstg
–40 to +150
C
Stresses exceeding those listed in the Maximum Ratings table may damage the device. If any of these limits are exceeded, device functionality should not be assumed,
damage may occur and reliability may be affected.
Recommended Operating Conditions at Ta = 25C
Parameter
Supply voltage
Load resistance
Symbol
Conditions
VCC
RL
Ratings
unit
13.2
V
Stereo
2 to8

Bridge
4 to 8

Functional operation above the stresses listed in the Recommended Operating Ranges is not implied. Extended exposure to stresses beyond the Recommended
Operating Ranges limits may affect device reliability.
ORDERING INFORMATION
See detailed ordering and shipping information on page 13 of this data sheet.
Semiconductor Components Industries, LLC, 2013
July, 2013
21500TH(KT)/90196RM/33194HO/8064KI/3233KI/O070KI,TS No.750-1/13
LA4440
Operating Characteristics at Ta = 25˚C, VCC=13.2V, RL=4Ω, f=1kHz, Rg=600Ω, with 100×100×1.5mm3 Al fin,
See specified Test Circuit.
Parameter
Symbol
Quiescent current
Icco
Voltage gain
VG
Output power
Total harmonic distortion
Input resistance
PO
THD
Conditions
THD=10%, Stereo
Ratings
min
VNO
Ripple rejection ratio
Channel separation
Rr
Ch sep
Muting attenuation
ATT
Gain difference between channels
∆VG
Unit
max
100
200
mA
49.5
51.5
53.5
dB
5.0
6.0
W
19
W
THD=10%, Bridge
PO=1W
0.1
ri
Output noise voltage
typ
1.0
%
Ω
30k
Rg=0
0.6
1.0
mV
Rg=10kΩ
1.0
2.0
mV
VR=200mV, fR=100Hz, Rg=0
VO=0dBm, Rg=10kΩ
46
dB
55
dB
VO=0dBm, VM=9V
45
40
dB
2
dB
Equivalent Circuit Block Diagram
No.750–2/13
LA4440
Sample Application Circuit 1. Stereo use
Sample Application Circuit 2. Bridge amplifier 1
No.750–3/13
LA4440
Sample Application Circuit 3. Bridge amplifier 2
Description of External Parts
C1 (C2)
· Feedback capacitor : The low cutoff frequency depends on this capacitor.
If the capacitance value is increased, the starting time is delayed.
C3 (C4)
· Bootstrap capacitor : If the capacitance value is decreased, the output at low frequencies goes lower.
C5 (C6)
· Oscillation preventing capacitor : Polyester film capacitor, being good in temperature characteristic,
frequency characteristic, is used.
The capacitance value can be reduced to 0.047µF depending on the stability of the board.
C7 (C8)
· Output capacitor : The low cutoff frequency depends on this capacitor.
At the bridge amplifier mode, the output capacitor is generally connected.
C9
· Decoupling capacitor :Used for the ripple filter. Since the rejection effect is saturated at a certain
capacitance value, it is meaningless to increase the capacitance value more than required. This capacitor, being also used for the time constant of the muting circuit, affects the starting time.
R1 (R2)
· Filter resistor for preventing oscillation.
R3 (R4)
· Resistor for making input signal of inverting amplifier in Voltage Gain Adjust at Bridge Amplifier
Mode (No. 1).
R5
· Resistor for adjusting starting time in Voltage Gain Adjust at Bridge Amplifier Mode (No. 2)
C10
· Capacitor for preventing oscillation in Voltage Gain Adjust at Bridge Amplifier Mode (No. 2)
C11
· Power source capacitor.
R6 (R7)
· Used at bridge amplifier mode in order to increase discharge speed and to secure transient stability.
Feaures of IC System and Functions of Remaining Pins
(a) Since the input circuit uses PNP transistors and the input potential is designed to be 0 bias, no input coupling
capacitor is required and direct coupling is available. However, when slider contact noise caused by the variable
resistor presents a problem, connect an capacitor in series with the input.
(b) The open-loop voltage gain is lowered and the negative feedback amount is reduced for stabilization. An increase
in distortion resulted from the reduced negative feedback amount is avoided by use of the built-in unique distortion reduction circuit, and thus distortion is kept at 0.1% (typ.).
(c) A capacitor for oscillation compensation is contained as a means of reducing the number of external parts. The
capacitance value is 35pF which determines high cutoff frequency fH (–3dB point) of the amplifier (fH≈20kHz).
(d) For preventing the IC from being damaged by a surge applied on the power line, an overvoltage protector is
contained. Overvoltage setting is 25V. It is capable of withstanding up to 50V at giant pulse surge 200ms.
(e) No damege occurs even when power is applied at a state where pins 10, 11, and 12 are short-circuited with solder
bridge, etc.
(f) To minimize the variations in voltage gain, feedback resistor RNF is contained and voltage gain (51.5dB) is fixed.
No.750–4/13
LA4440
Voltage Gain Adjust at Stereo Mode
RNF=50Ω (typ), Rf=20kΩ (typ)
At RNF’=0 (recommended VG)
VG=20log
VG
(dB)
RNF
In case of using RNF’
VG=20log
Rf
(dB)
RNF+RNF’
Voltage Gain Adjust at Bridge Amplifier Mode (No. 1)
· The bridge amplifier configuration is as shown left, in
which ch1 and ch2 operate as noninverting amplifier
and inverting amplifier respectively.
The output of the noninverting amplifier divided by
resistors R3, R4 is applied, as input, to the inverting
amplifier.
Since attenuation (R4/R3) of the non-inverting amplifier
output and amplification factor (Rf/R4+RNF) of the
inverting amplifier are fixed to be the same, signals of
the same level and 180° out of phase with each other
can be obtained at output pins (12) and (10). The total
voltage gain is apparently higher than that of the
noninverting amplifier by 6dB and is approximately
calculated by the following formula.
Rf
VG=20log R
+ 6dB
NF
In case of reducing the voltage gain, RNF’ is connected
to the noninverting amplifier side only and the following
formula is used.
VG=20log
Rf
+ 6dB
RNF+RNF’
Voltage Gain Adjust at Bridge Amplifier Mode (No. 2)
Rf
VG=20log R +R ’ (dB)
NF
NF
2
where (RNF+RNF’) << R5
From this formula, it is seen that connecting RNF’
causes the voltage gain to be reduced at the modes of
both stereo amplifier and bridge amplifier.
No.750–5/13
LA4440
(g) In case of applying audio muting in each application circuit, the following circuit is used.
6V≤VM≤VCC
Recommended VM=9V
ATT=40dB (Rg=600Ω)
Flow-in current IO is calculated by the following formula.
IO=
VM – VBE
RO
In case of increasing the muting attenuation, resistor 5.6kΩ is connected in series with the input, and then the
attenuation is made to be 55dB. Be careful that connecting an input capacitor causes pop noise to be increased at
the time of application of AC muting. Increased RO, CO make it possible to reduce the noise. In case of completely cutting off power IC, pin (5) is grounded, and then DC control is available and the attenuation is made to
be ∞.
Stereo
: 20Ω≤R≤100Ω
Bridge No.1 : 20Ω≤R≤100Ω
Bridge No. 2 : 0Ω≤R≤50Ω
Pin Voltage (unit : V)
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
Function pin
CH1
NF
CH1
NF
Pre
GND
AC
Audio
Muting
DC
CH2
IN
CH2
NF
CH2
Power
GND
CH2
BS
CH2
OUT
VCC
CH1
OUT
CH1
BS
CH1
Power
GND
Pin Voltage at
quiescent mode
1.4
0.03
0
0
13.0
0.03
1.4
0
11.9
6.8
13.2
6.8
11.9
0
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.
· Printed circuit board
When making the board, refer to the sample printed circuit pattern and be careful that no feedback loop is formed
between input and output.
· Oscillation preventing capacitor
Normally, a polyester film capacitor is used for 0.1µF + 4.7Ω. The capacitance value can be reduced to 0.047µF depending on the stability of the board.
· Others
Connect the radiator fin of the package to GND.
No.750–6/13
LA4440
Characteristics at stereo amplifier mode
No.750–7/13
LA4440
No.750–8/13
LA4440
Characteristics at bridge amplifier mode No. 1
No.750–9/13
LA4440
No.750–10/13
LA4440
Characteristics at bridge amplifier mode No. 2
No.750–11/13
LA4440
Proper Cares in Mounging Radiator Fin
1. The mounting torque is in the range of 39 to 59N · cm.
2. The distance between screw holes of the radiator fin must coincide with the distance between screw holes of the IC.
With case outline dimensions L and R referred to, the screws must be tightened with the distance between them as
close to each other as possible.
3. The screw to be used must have a head equivalent to the one of truss machine screw or binder machine screw defined
by JIS. Washers must be also used to protect the IC case.
4. No foreign matter such as cutting particles shall exist between heat sink and radiator fin. When applying grease on the
junction surface, it must be applied uniformly on the whole surface.
5. IC lead pins are soldered to the printed circuit board after the radiator fin is mounted on the IC.
No.750–12/13
LA4440
ORDERING INFORMATION
Device
LA4440J-K-E
Package
SIP14H
(Pb-Free)
Shipping (Qty / Packing)
15 / Fan-Fold
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PS No.750-13/13
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