LA4440J-K-E - ON SEMICONDUCTOR

21500TH(KT)/90196RM/33194HO/8064KI/3233KI/O070KI,TS No.750-1/13

http://onsemi.com

Semiconductor Components Industries, LLC, 2013

July, 2013

ORDERING INFORMATION

See detailed ordering and shipping information on page 13 of this data sheet.

LA4440

Features 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 freque ncies.

 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

Specifications

Absolute Maximum Ratings at Ta = 25C

Parameter Symbol Conditions Ratings unit

Maximum supply voltage VCC max1 Quiescent (t=30s) 25 V

VCC max2 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

Recommended Operating Conditions at Ta = 25C

Parameter Symbol Conditions Ratings unit

Supply voltage VCC 13.2 V

Load resistance RL

Stereo 2 to8 

Bridge 4 to 8 

Monolithic Linear IC

6W 2-Channel, Bridge 19W(typ)

Power Amplifier

Ordering number : EN750F

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.

unit : mm

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.

LA4440

No.750–2/13

Operating Characteristics at Ta = 25˚C, VCC=13.2V, RL=4Ω, f=1kHz, Rg=600Ω, with 100×100×1.5mm3 Al f in,

See specified Test Circuit.

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Equivalent Circuit Block Diagram

LA4440

No.750–3/13

Sample Application Circuit 1. Stereo use

Sample Application Circuit 2. Bridge amplifier 1

LA4440

No.750–4/13

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 capaci-

tor, 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 distor-

tion reduction circuit, and thus distortion is kept at 0.1% (typ.).

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.

LA4440

No.750–5/13

Voltage Gain Adjust at Stereo Mode

RNF=50Ω (typ), Rf=20kΩ (typ)

At RNF’=0 (recommended VG)

VG=20log (dB)

In case of using RNF’

VG=20log (dB)

RNF

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.

VG=20log + 6dB

In case of reducing the voltage gain, RNF’ is connected

to the noninverting amplifier side only and the following

formula is used.

VG=20log + 6dB

VG=20log (dB)

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.

RNF

Voltage Gain Adjust at Bridge Amplifier Mode (No. 2)

RNF+RNF’

LA4440

No.750–6/13

(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=

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 com-

pletely cutting off power IC, pin (5) is grounded, and then DC control is available and the attenuation is made to

be ∞.

VM – VBE

Stereo : 20Ω≤R≤100Ω

Bridge No.1 : 20Ω≤R≤100Ω

Bridge No. 2 : 0Ω≤R≤50Ω

Pin Voltage (unit : V)

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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 v ariation 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 ca pacitor is used for 0.1µF + 4.7Ω. The capacitance value can be reduced to 0.047µF depend-

ing on the stability of the board.

· Others

Connect the radiator fin of the package to GND.

LA4440

No.750–7/13

Characteristics at stereo amplifier mode

LA4440

No.750–8/13

LA4440

No.750–9/13

Characteristics at bridge amplifier mode No. 1

LA4440

No.750–10/13

LA4440

No.750–11/13

Characteristics at bridge amplifier mode No. 2

LA4440

No.750–12/13

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 f in 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 scre w to be used must ha v e a head equivalent to the one of truss machine scr e w or binder mac hine scre w 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 radia tor 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.

LA4440

PS No.750-13/13

ORDERING INFORMATION

Device Package Shipping (Qty / Packing)

LA4440J-K-E SIP14H

(Pb-Free) 15 / Fan-Fold

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