LA4183.PDF

Ordering number: EN887B

Monolithic Linear IC

LA4183

2.3 W 2-Channel AF Power Amplifier for Radio

Cassette Players

Features

. Built-in 2 channels enabling use in stereo and bridge

amplifier (BTL) applications.

Package Dimensions

unit : mm

. High-output:

2.3 W typ./channel, V CC =9V,R L =4W

4.7 W typ./bridge amplifier, V CC =9V,R L =8W

3022A-DIP12F

[LA4183]

. Low switching distortion at high frequencies.

. Minimum number of external parts required: 9 pcs. min.

(Stereo/bridge).

. Small shock noise at the time of power supply ON/OFF due

to built-in muting circuit.

. Good ripple rejection due to built-in ripple filter.

. Soft tone at the time of output saturation.

. Good channel separation.

. Voltage gain fixed at 45 dB (Bridge: 51 dB).

Variable voltage gain available with external resistor added.

SANYO : DIP12F

Note:

In general applications, heat generated in the DIP 12-pin

package can be radiated through the Cu-foiled area of the

printed circuit board, but since power dissipation Pd may be

increased depending on the supply voltage and load conditions,

it is recommended to use a fin additionally.

Specifications

Maximum Ratings at Ta = 25°C

Parameter

Symbol

Conditions

Ratings

Unit

Maximum supply voltage

V CC max

With signal

Quiescent

Allowable power dissipation

Pd max

With printed circuit board

(Refer to Pd – Ta characteristics)

4 W

Operating temperature

Topr

–20 to +75 °C

Storage temperature

Tstg

–55 to +150 °C

Operating Conditions at Ta = 25°C

Parameter

Symbol

Conditions

Ratings

Unit

Recommended supply voltage

V CC

9.0

Stereo

4.0 to 8.0

Load resistance

R L

Bridge

8.0

SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters

TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN

53096HA(II)/O0207TA/2022KI,TS,ID No.887-1/11

LA4183

Operating Characteristics at Ta = 25°C, V CC =9.0V,f=1kHz, Rg = 600

,R L =4

, ( ): 8

See specified Test Circuit.

Parameter

Symbol

Conditions

min typ max Unit

Quiescent current

I CCO For stereo

40 55 mA

Voltage gain

VG Closed loop, V IN = –45 dB

Stereo

43 45 47 dB

Bridge

49 51 53 dB

Voltage gain difference

D VG

Stereo

± 1 dB

Stereo

1.7 2.3

Output power

P O THD = 10%

(1.3)

Bridge

(4.7)

Total harmonic distortion

THD P O = 250 mW

Stereo

0.3 1.5 %

Bridge

0.5

Input resistance

21 30

Output noise voltage

V NO

Rg = 0

Stereo

0.3 1.0 mV

Rg=10k W

Stereo

0.5 2.0 mV

Ripple rejection ratio

— Rg = 0, Vr = 150 mV

Stereo

40 46

Channel separation

CHsep Rg = 10 k W ,V O = 0 dBm

Stereo

40 55

Pd max – Ta

Cu plate (fin 1)

Fe plate (fin 1)

Fe plate (fin 2)

Recommended

printed circuit

board only

Cu-foiled area

reduced board

IC only

Ambient temperature, Ta – °C

Pin Assignment and Equivalent Circuit

No.887-2/11

LA4183

Sample Application Circuit 1: Stereo amplifier

Sample Application Circuit 2: Bridge amplifier

Example of printed circuit pattern

(Cu-foiled area) for use in stereo, bridge amplifier applications

60 ´ 80 mm 2

OUT1

100 m F

/16V

470

/16V

V CC

IN1

0.15 m F

100 m F/16V

C10

1000 m F

/16V

LA4183

GND jumper

2ch stereo use

100

/16V

IN2

100

0.15 m F

F/16V

100 m F/16V

BTL use

100 m F/16V

OUT2

BTL OUT

470

F/16V

No.887-3/11

LA4183

Description of External Parts

C1 (C2)

Feedback capacitor

The low-range cut-off frequency is determined by the following formula:

f L =1/(2 p C1 v Rf), f L : Low-range cut-off frequency

Rf: Feedback resistor

(50 W embedded + Rf externally connected)

The frequency, however, affects the starting time in conjuction with

decoupling capacitors. Therefore, it is necessary to determine it after a

full review of the required low-frequency range and other similar

conditions.

C3 (C4)

Bootstrap capacitor

The output at low frequencies depends on this capacitor. If the capacity

is decreased, the output at low frequencies goes lower. 47 µF min. is

required.

C5 (C6)

Oscillation preventing capacitor

Use polyester film capacitor which is good in temperature characteristic

and frequency characteristic. Aluminum electrolytic capacitor or

ceramic capacitor causes oscillation at low temperatures.

C7 (C8)

Output capacitor

The low-range cut-off frequency is determined by the following formula.

f L =1/(2

C7 v R L ), f L : Low-range cut-off frequency

R L :Load resistance

When using bridge-connected, double the capacitance to obtain

equivalent low-range frequency characteristics to those in a 2-channel

application.

Decoupling capacitor

Used for the ripple filter. Since the rejection effect is saturated at a

certain capacity, it is meaningless to increase the capacity more than

needed.

This capacitor, being also used for the time constant of the muting

circuit, affects the starting time.

C10

Power source capacitor

Application Circuits

1. Voltage gain adjustment

. Stereo

The voltage gain depends on built-in-resistors R1 (R2), R3 (R4) as follows:

VG = 20 log

R3 (R4)

R1 (R2)

[dB]

If the IC is used at a voltage gain less than this, the following

equation with Rf added applies.

VG = 20 log

R3 (R4)

R1 (R2) + Rf

[dB]

where R1 (R2) = 50 W typ.,

R3 (R4) = 10 kW typ.

. Bridge

The following shows the bridge amplifier configuration, where ch1 operates as a non-inverting amplifier and ch2 as an inverting

amplifier.

No.887-4/11

LA4183

The output of ch1 is divided with R5, R6 and led to pin 1 and then inputted to ch2. Since the attenuation degree (R5/R6) of ch1

output and the amplification degree (R4/R2 + R6)) of ch2 are fixed at an equal value, the ch2 output is in opposite phase with the

ch1 output. Therefore, the total voltage gain gets apparently 6 dB higher than the voltage gain of ch1 alone and is determined by

the following equation.

VG = 20 log

+ 6 [dB]

If the IC is used at a voltage gain less than this, the following equation with Rf added applies.

VG = 20 log

R1+Rf

+ 6 [dB]

2. Starting time

Starting time depends on capacitance of C1 (C2) and C9 as shown in the diagram below. That is because of using a muting circuit

utilizing the C9 (decoupling capacitor) time constant for pop noise prevention when power is turned on and charging circuits for

C1 and C2 (NF capacitors).

Quiescent

Dependence on C9

Quiescent

Dependence on C1 (C2)

3. Crosstalk

Channel separation characteristic is important for single-package IC embodying two channels.

With LA4183, good channel separation is obtainable even as is, but if the BTL OUT pin (pin 1) is not grounded, it will invite

imbalance in crosstalk between the two channels. (Refer to the characteristics diagram.)

No.887-5/11

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