la4182.pdf part of Sanyo LA4182 la4182.pdf, 2.3W 2-channel AF power amplifier text manual preview

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Ordering number: EN742G

Monolithic Linear IC

LA4182 2.3 W 2-Channel AF Power Amplifier

Features

Package Dimensions
unit : mm

. Built-in 2 channels enabling use in stereo and bridge . amplifier applications. V = 9 V, R = 4 , and High output: 2.3 W/channel, 4.7 W/bridge, R = 8 . . Minimum number of external parts required : 9 pcs. min. . (Stereo/bridge). at the time of power supply ON/OFF due to Small pop noise muting circuit. . built-inripple rejection ratio due to built-in ripple filter. Good . 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. Easy to design radiator fin.
CC L L

3022A-DIP12F
[LA4182]

SANYO : DIP12F

Note) In general applications, heat generated in this 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 Maximum supply voltage Allowable power dissipation Operating temperature Storage temperature Symbol VCC max Pd max Topr Tstg With signal Quiescent With printed circuit board (Refer to Pd-Ta characteristics) Conditions Ratings 11 15 4 -20 to +75 -55 to +150 Unit V V W °C °C

Recommended Operating Conditions at Ta = 25°C
Parameter Supply voltage Load resitance Symbol VCC RL Stereo Bridge Conditions Ratings 9 4 to 8 8 Unit V

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41596HA(II)/O207KI/2146KI/4025KI/O291KI,TS No.742-1/9

LA4182
Operating Characteristics at Ta = 25°C, VCC = 9 V, f = 1 kHz, RL = 4 , Rg = 600 , ( See specified Test Circuit.
Parameter Quiescent current Voltage gain Voltage gain difference Output power Total harmonic distortion Input resistance Output noise voltage Ripple rejection ratio Channel separation Symbol ICCO VG VG PO THD ri VNO Rr CHsep Rg Rg Rg Rg = = = = 0 10 k 0, VR = 150 mV 10 k, VO = 0 dB Stereo Stereo Stereo Stereo Conditions Stereo Stereo Closed loop, VIN = -45 dB Stereo Closed loop, VIN = -45 dB Bridge Stereo THD = 10% THD = 10% PO = 250 mW PO = 250 mW Stereo Bridge Stereo Bridge 21 min 43 49 1.7 typ 40 45 51 2.3 (1.3) (4.7) 0.3 0.5 30 0.3 0.5 46 55

): 8 ,
max 55 47 53 ą1 Unit mA dB dB dB W 1.5 W % % k mV mV dB dB

1.0 2.0

40 40

Allowable power dissipation, Pd max - W

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

Shock noise rejecter

Input amp 1

Output amp 1 Ripple filter

Input amp 2

Output amp 2

Unit (resistance: )

No.742 -2/9

LA4182
Sample Application Circuit 1 : Stereo

(Mylar)

(Mylar)

Unit (capacitance: F)

Stereo

Bridge

Unit (capacitance: F) Example of printed pattern (bottom view) for use in stereo, bridge amplifier applications : 60 × 80 mm2

Sample Application Circuit 2 : Bridge

(Mylar)

(Mylar)

Unit (capacitance: F)

No.742 -3/5

LA4182
Description of External Parts
C1(C2) C3(C4) C5(C6) Feedback capacitor Bootstrap capacitor Oscillation preventing capacitor The low cutoff frequency depends on this capacitor. If the capacity is increased, the starting time is delayed. If the capacity is decreased, the output at low frequencies goes lower. Polyester film capacitor, being good in temperature characteristic, frequency characteristic, is used. If an aluminum electrolytic capacitor or ceramic capacitor is used, oscillation may occur at low temperatures. The low cutoff frequency depends on this capacitor. In order for the low frequency characteristic in the bridge amplifier to be equal to that in the stereo amplifier application, the capacity must be doubled. 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.

C7(C8)

Output capacitor

C9

Decoupling capacitor

C10

Power source capacitor

Application Circuit
1. Voltage gain adjustment

k Stereo The voltage gain depends on built-in resistors R1 (R2), R3 (R4) as follows : VG = 20log R3 (R4) [dB] R1 (R2)

If the IC is used at a voltage gain less than this, the following equation with Rf added applies. VG = 20log R3 (R4) [dB] R1 (R2) + Rf

where R1 (R2) = 50 , R3 (R4) = 10 k k Bridge

The above shows the bridge amplifier configuration, where ch.1 operates as a noninverting amplifier and ch.2 as an inverting amplifier. The output of ch.1 is divided with R5, R6 and led to pin 1 and then input to ch.2. Since the attenuation degree (R5/R6) of ch. 1 output and the amplification degree (R4/R2 + R6) of ch. 2 are fixed at an equal value, the ch.2 output is in opposite phase with the ch. 1 output. Therefore, the total voltage gain gets apparently 6 dB higher than the voltage gain of ch.1 alone and is determined by the following equation. VG = 20log R3 + 6 [dB] R1

If the IC is used at a voltage gain less than this, the following equation with Rf added applies. VG = 20log R3 + 6 [dB] R1 + Rf

No.742 -4/9

LA4182
2. Proper cares in using IC be exceeded, thereby leading to a breakdown. Allow an ample margin of variation for supply voltage, etc. and use the IC in the range where the maximum rating is not exceeded. Pin-to-pin short If the supply voltage is applied when the space between pins is shorted, a breakdown or deterioration may occur. When mounting the IC on the board of applying the supply voltage, make sure that the space between pins is not shorted with solder, etc. Load short If the IC is used with the load shorted for a long time, a breakdown or deterioration may occur. Be sure not to short the load. When the IC is used in radios or radio-cassette tape recorders, keep a good distance between IC and bar antenna. When making the board, refer to the example of printed circuit pattern.

. If the IC is used in the vicinity of the maximum rating, even a slight variation in conditions may cause the maximum rating to . . . .

Proper cares in operating a set with LA4182 incorporated
When a set with the LA4182 incorporated is operated from AC power supply, a momentary drop in supply voltage is caused by the transformer regulation, etc. at the time of turning ON the motor with the circuit shown below. In this case, if ripple noise is generated from the speaker or headphone, take the following actions. 1. 2. Connect a diode (rectifier diode of average rectified current IO = 100 to 200 mA) across pins 6 and 12 of the LA4182 so that the voltage at pin 6 can follow the supply voltage regulation. In the steady state, this diode is cut off. Increase the capacity of the power source capacitor so that the supply voltage regulation can be minimized.

Unit (capacitance: F)

Radiation design

. Since the DIP 12-pin package is so designed as to be able to radiate heat through the Cu-foiled area of printed circuit board . . .
under normal operating conditions, make the Cu-foilled area near the fin of IC as large as possible when designing the printed circuit board. By providing the Cu-foiled area covered by the broken line as shown in the above-mentioned example of printed circuit pattern, a rather satisfactory radiation is enabled. (Refer to the Pd max-Ta characteristics.) Since the power dissipation (Pd) goes higher depending on the conditions of supply voltage and load, it is recommended to use a fin together with the printed circuit board. The following equations are rule-of-thumb guides for Pd (for stereo). For AC power supply, it is desirable to measure with the transformer of each individual set. In the bridge amplifier application, calculation should be made with 1/2 of the load used.

(1) DC power supply Pd max = VCC2 2RL + ICCO v VCC (For stereo)

No.742 -5/9

LA4182
(2) AC power supply Pd max = VCC2 VCC (Pd) VCC1 r ICCO VCC (Pd)2 + ICCO v VCC (Pd) (For stereo) 2RL : Quiescent supply voltage : Supply voltage at max. output,

: Supply voltage at max. output : Voltage regulation, : Quiescent current VCC2 - VCC1 VCC1

Example of fin mounting
The fin is formed into such a shape as to be able to radiate heat from the plastic fin area of IC and the fin as shown below and is soldered to the printed circuit board. For the fin size, refer to the Pd max-Ta characteristics. The desirable material is copper or iron which is solderable. It is recommended to apply silicone grease, etc. to the plastic area of IC in order to minimize the thermal resistance. Printed circuit board

Example of fin-mounting
Fin

[Stereo Application]

Output power, PO - W

Response - dB

Input voltage, VIN - mV

Frequency, f - Hz

No.742 -6/9

Output ripple voltage, Vrp - mV Output noise voltage VNO - mV Total harmonic distortion, THD - % Voltage gain, VG - dB

Total harmonic distortion, THD - %

VCC (Ripple) = 150 mVrms/f = 50 Hz

Frequency, f - Hz

Output power, PO - W

Frequency, f - Hz

Signal source resistance, Rg - Channel separation, CHsep - dB Total harmonic distortion, THD - % Frequency, f - Hz
Amp. 1 2 Amp. 2 1

LA4182

Power dissipation, Pd (Stereo) - W

Total harmonic distortion, THD - %

Using specified fin

Frequenccy, f - Hz

Output power, PO - W

Output power, PO - W

No.742 -7/9

Output power, PO - W
Using specified fin

Output voltage, VN (Midpoint voltage) - V

Output power, PO - W

Power dissipation, Pd (Stereo) - W

Output power, PO - W

Supply voltage, VCC - V

Ambient temperature, Ta - °C [Bridge Application]

Input voltage, VIN - mV Quiescent current, ICCO - mA Quiescent current, ICCO - mA (Stereo) Output power, PO - W Supply voltage, VCC - V Midpoint voltage, VN - V

LA4182

Response - dB

Current drain, ICC - mA

Ambient temperature, Ta - °C

Frequency, f - Hz

No.742 -8/9

LA4182

Total harmonic distortion, THD - %

Total harmonic distortion, THD - %

Output power, PO - W Total harmonic distortion, THD - %

Output power, PO - W

Power dissipation, Pd - W

Using specified fin

Frequency, f - Hz

Output power, PO - W

Current drain, ICC - mA

Output power, PO - W

Supply voltage, VCC - V

Output power, PO - W

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 April, 1996. Specifications and information herein are subject to change without notice.

No.742 -9/9