Ordering number: EN1321E Monolithic Linear IC LA4261 3.5 W 2-Channel AF Power Amplifier for Home Stereos and Music Centers Features Package Dimensions . Minimum number of external parts required (No input bootstrap capacitor required). . capacitor, High output: 3.5 W typ. ×2. . Soft clip, causing little harmonic disturbance to radios page 8). . (See Small pop noise at the time of power switch ON/OFF page 8). . (See Built-in protector against abnormal modes (Thermal 3018A-SIP10F unit : mm [LA4261] shutdown, overvoltage). SANYO : SIP10F Specifications Maximum Ratings at Ta = 25°C Parameter Symbol Maximum supply voltage VCCmax Maximum output current IOP Allowable power dissipation Pd max Conditions Ratings Unit 25 V 1 channel 2.0 A With heat sink (see Pd – Ta characteristics) 7.5 W Operating temperature Topr –20 to +75 °C Storage temperature Tstg –40 to +150 °C Ratings Unit Operating Conditions at Ta = 25°C parameter Symbol Conditions Recommended supply voltage VCC 16 V Recommended load resistance RL 8 Ω Operating supply voltage range VCC op 9 to 24 V SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN 22897HA(II)/71093TS/2126KI/8064KI/8053KI,MT No.1321-1/8 LA4261 Operating Characteristics at Ta = 25°C, VCC = 16 V, RL = 8 Ω, f = 1 kHz, Rg = 600 Ω, (circuit 1) Parameter Quiescent current Symbol Conditions min ICCO Voltage gain VG Output power PO THD = 10% Total harmonic distortion THD PO = 0.5 W Output noise voltage VNO Rg = 10 kΩ, BW = 20 Hz to 20 kHz typ max Unit 46 62 mA 48 50 52 dB 3.0 3.5 W 0.3 1.0 % 0.65 1.5 mV Ripple rejection ratio Rr Rg = 0, Vr = 500 mV 40 50 dB Crosstalk CT Rg = 10 kΩ 40 55 dB Voltage gain difference ∆VG 1.5 dB Pd max – Ta Infinite heat sink Al heat sink Tightening torque 39 Nccm Silicon grease applied Thermal resistance between junction and outside air θj-c 10°C/W 2.5 No heat sink Ambient temperature, Ta – °C Thermal resistance of heat sink, θf – °C/W Allowable power dissipation, Pd max – W Equivalent Circuit Block Diagram θf – Sf Al heat sink t = 1.5 mm Area of heat sink, Sf – cm2 No.1321-2/8 LA4261 Sample Application Circuit 1: Sample Application Circuit 2: Recommended Circuit Circuit with minimum number of external parts Unit (resistance: Ω, capacitance: F) Sample Printed Circuit Pattern Unit (resistance: Ω, capacitance: F) Description of External Parts C1, C4 100 µF Feedback capacitor Decreasing the capacitance value lowers the low frequency response. Increasing the capacitance value makes the starting time later. C2, C3 330 pF Input short capacitor Reduces the high frequency noise when the input impedance is increased. Not required when the input impedance is decreased. C5, C7 470 µF Output capacitor Decreasing the capacitance value causes insufficient power at low frequencies. C6, C8 0.1 µF polyester film capacitor Oscillation blocking capacitor Decreasing the capacitance value causes oscillation to occur easily. Use a polyester film capacitor that is good in high frequency response and temperature characteristic. The use of an electrolytic capacitor may cause oscillation to occur at low temperatures. C9 470 µF Power capacitor Decreasing the capacitance value causes ripple to occur. Locating at a distance from the IC or removing this capacitor may cause oscillation to occur. C10 100 µF Ripple filter capacitor Decreasing the capacitance value excessively or removing this capacitor causes ripple to occur. However, increasing the capacitance value does not always cause ripple to be reduced. Decreasing the capacitance value makes the starting time earlier. R1, R2 100 kΩ Input bias resistor Determines the bias (bias of GND potential) to be applied to the input pin and the input impedance. Not required if variable resistors are used. R3, R4 3.3 Ω Resistor connected in series with oscillation blocking capacitor. Prevents phase shift attributable to the oscillation blocking capacitor so that oscillation is hard to occur. No.1321-3/8 LA4261 Note for Changing Voltage Gain Basically, the voltage gain can be reduced by adding external resistors (RNF) in series with feedback capacitors C1, C4. However, it should be noted that since there is no phase compensation pin the frequency response is extended and oscillation is liable to occur when the voltage gain is reduced. The voltage gain must not be reduced to be less than 30 dB. External Muting If external muting is required, make the circuit as shown right. In this case, the attack time, recovery time, and pop noise are similar to those which occur at the time of power switch ON/OFF. Unit (resistance: Ω, capacitance: F) 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. . Pin-to-pin short If power is applied when the space between pins is shorted, breakdown or deterioration may occur. When mounting the IC on the board or applying power, make sure that the space between pins is not shorted with solder, etc. . When using in radios, allow a sufficient space between IC and bar antenna. . Printed circuit pattern When designing the printed circuit pattern, make the power supply, output, and ground lines thick and short and arrange the pattern and parts so that no feedback loop is formed between input and output. Place power capacitor C9, oscillation blocking capacitors C6, C8 as close to IC pins as possible to prevent oscillation from occurring. Refer to the sample printed circuit pattern. PO – VIN Output power, PO – W Total harmonic distortion, THD – % THD – PO Input voltage, VIN – mV Output power, PO – W No.1321-4/8 LA4261 THD – f Output power, PO – W Total harmonic distortion, THD – % PO – f Frequency, f – Hz f Response Response – dB Output power, PO – W Frequency, f – Hz PO – VCC Frequency, f – Hz Pd – PO Power dissipation, Pd – W Current dissipation, ICC – mA Supply voltage, VCC – V ICC – PO Output power, PO – W ICCO – VCC Output power, PO – W Vpin – VCC Quiescent Pin voltage, Vpin – V Quiescent current, ICCO – mA Quiescent Pin 3 Pin 1, 2, 4, 6, 7, 10 Pin 7, 10 Pin 2, 4 Pin 1, 6 Supply voltage, VCC – V Supply voltage (pin 9), VCC – V No.1321-5/8 LA4261 Vro – VCC FILTER 20 Hz to 20 kHz Output ripple voltage, Vro – mV Output noise voltage, VNO – mV VNO – Rg Supply voltage, VCC – V CT – f Crosstalk, CT – dB Output ripple voltage, Vro – mV Signal source resistance, Rg – Ω Vro – Vr Ripple voltage, Vr – V ICCO – Ta Frequency, f – Hz VG – RNF Voltage gain, VG – dB Quiescent current, ICCO – mA Quiescent External resistance, RNF – Ω Ambient temperature, Ta – °C f Response Response – dB Total harmonic distortion, THD – % THD – f Frequency, f – Hz Frequency, f – Hz No.1321-6/8 LA4261 VNO – VG Output noise voltage, VNO – mV Total harmonic distortion, THD – % THD – VG Voltage gain, VG – dB Output ripple voltage, Vrp – mV Voltage gain, VG – dB Vrp – VG FILTER 20 Hz to 20 kHz Voltage gain, VG – dB No.1321-7/8 LA4261 Pop Noise Waveform at The Time of Power Switch ON (VCC = 16 V, RL = 8 Ω, quiescent) Pop noise waveform Pop Noise Waveform at The Time of Power Switch OFF (VCC = 16 V, RL = 8 Ω, quiescent) Pop noise waveform Middle point rise waveform Middle point fall waveform f = 1 kHz Clip waveform (VCC = 16 V, RL = 8 Ω, THD = 5%) f = 10 kHz Clip waveform (VCC = 16 V, RL = 8 Ω, THD = 5%) 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 February 1997. Specifications and information herein are subject to change without notice. No.1321-8/8