Ordering number: EN742G Monolithic Linear IC LA4182 2.3 W 2-Channel AF Power Amplifier Package Dimensions Features . Built-in 2 channels enabling use in stereo and bridge applications. . amplifier High output: 2.3 W/channel, V = 9 V, R = 4 Ω, and W/bridge, R = 8 Ω. . 4.7 Minimum number of external parts required : 9 pcs. min. . (Stereo/bridge). Small pop noise at the time of power supply ON/OFF due to muting circuit. . built-in Good ripple rejection ratio 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 gain available with external resistor added. . voltage Easy to design radiator fin. CC unit : mm 3022A-DIP12F L [LA4182] L 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 Symbol VCC max Pd max Conditions Ratings Unit With signal 11 V Quiescent 15 V 4 W With printed circuit board (Refer to Pd-Ta characteristics) Operating temperature Topr −20 to +75 °C Storage temperature Tstg −55 to +150 °C Ratings Unit Recommended Operating Conditions at Ta = 25°C Parameter Supply voltage Load resitance Symbol Conditions VCC RL 9 V Stereo 4 to 8 Ω Bridge 8 Ω SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN 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 Ω, Rg = 600 Ω, ( See specified Test Circuit. Parameter Quiescent current Voltage gain Symbol ICCO VG Voltage gain difference Output power Total harmonic distortion Input resistance ∆VG PO THD min THD = 10% Stereo 1.7 THD = 10% PO = 250 mW PO = 250 mW Bridge Stereo Bridge Rg Rg Rg Rg Stereo Stereo Stereo Stereo ri Output noise voltage VNO Ripple rejection ratio Channel separation Rr CHsep Allowable power dissipation, Pd max − W Conditions Stereo Stereo Closed loop, VIN = −45 dB Stereo Closed loop, VIN = −45 dB Bridge Stereo 43 49 21 = = = = 0 10 kΩ 0, VR = 150 mV 10 kΩ, VO = 0 dB 40 40 typ 40 45 51 2.3 (1.3) (4.7) 0.3 0.5 30 0.3 0.5 46 55 ): 8 Ω, max 55 47 53 ±1 Unit mA dB dB dB W 1.5 1.0 2.0 W % % kΩ mV mV dB dB 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: Ω) 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) Feedback capacitor The low cutoff frequency depends on this capacitor. If the capacity is increased, the starting time is delayed. C3(C4) Bootstrap capacitor If the capacity 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. If an aluminum electrolytic capacitor or ceramic capacitor is used, oscillation may occur at low temperatures. C7(C8) Output capacitor 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. C9 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 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 Ω, R3 (R4) = 10 kΩ 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 . If the IC is used in the vicinity of the maximum rating, even a slight variation in conditions may cause the maximum rating to . . . . 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. 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 π2RL + ICCO v VCC (For stereo) No.742 -5/9 LA4182 (2) AC power supply Pd max = VCC (Pd)2 + ICCO v VCC (Pd) (For stereo) π2RL VCC2 : Quiescent supply voltage VCC (Pd) : Supply voltage at max. output, VCC1 : Supply voltage at max. output r : Voltage regulation, ICCO : 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 Response − dB Output power, PO − W [Stereo Application] Input voltage, VIN − mV Frequency, f − Hz No.742 -6/9 Output ripple voltage, Vrp − mV Output noise voltage VNO − mV VCC (Ripple) = 150 mVrms/f = 50 Hz Signal source resistance, Rg − Ω Power dissipation, Pd (Stereo) − W Channel separation, CHsep − dB Total harmonic distortion, THD − % Total harmonic distortion, THD − % Total harmonic distortion, THD − % Total harmonic distortion, THD − % Voltage gain, VG − dB LA4182 Frequency, f − Hz Output power, PO − W Output power, PO − W Frequency, f − Hz Frequency, f − Hz Amp. 1 → 2 Amp. 2 → 1 Frequenccy, f − Hz Using specified fin Output power, PO − W No.742 -7/9 Response − dB Output power, PO − W Quiescent current, ICCO − mA Output voltage, VN (Midpoint voltage) − V Power dissipation, Pd (Stereo) − W Input voltage, VIN − mV Current drain, ICC − mA Using specified fin Output power, PO − W Supply voltage, VCC − V Ambient temperature, Ta − °C [Bridge Application] Midpoint voltage, VN − V Quiescent current, ICCO − mA (Stereo) Output power, PO − W LA4182 Output power, PO - W Supply voltage, VCC − V Ambient temperature, Ta − °C Frequency, f − Hz No.742 -8/9 Total harmonic distortion, THD − % Total harmonic distortion, THD − % LA4182 Output power, PO − W Power dissipation, Pd − W Total harmonic distortion, THD − % Output power, PO − W Using specified fin Output power, PO − W Output power, PO − W Current drain, ICC − mA Frequency, f − Hz 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