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| Ordering number: EN1321E Monolithic Linear IC LA4261 3.5 W 2-Channel AF Power Amplifier for Home Stereos and Music Centers Features Package Dimensions 3018A-SIP10F unit : mm [LA4261] . Minimum number of external parts required (No input . capacitor, bootstrap capacitor required). output: 3.5 x2. . Highclip, causingW typ.harmonic disturbance to radios Soft little . (See page 8). at the time of power switch ON/OFF Small pop noise . (See page 8). against abnormal modes (Thermal Built-in protector shutdown, overvoltage). SANYO : SIP10F Specifications Maximum Ratings at Ta = 25C Parameter Maximum supply voltage Maximum output current Allowable power dissipation Operating temperature Storage temperature Symbol VCCmax IOP Pd max Topr Tstg 1 channel With heat sink (see Pd - Ta characteristics) Conditions Ratings 25 2.0 7.5 -20 to +75 -40 to +150 Unit V A W C C Operating Conditions at Ta = 25C parameter Recommended supply voltage Recommended load resistance Operating supply voltage range Symbol VCC RL VCC op Conditions Ratings 16 8 9 to 24 Unit V 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 = 25C, VCC = 16 V, RL = 8 , f = 1 kHz, Rg = 600 , (circuit 1) Parameter Quiescent current Voltage gain Output power Total harmonic distortion Output noise voltage Ripple rejection ratio Crosstalk Voltage gain difference Symbol ICCO VG PO THD VNO Rr CT VG THD = 10% PO = 0.5 W Rg = 10 k, BW = 20 Hz to 20 kHz Rg = 0, Vr = 500 mV Rg = 10 k 40 40 48 3.0 Conditions min typ 46 50 3.5 0.3 0.65 50 55 1.5 1.0 1.5 max 62 52 Unit mA dB W % mV dB dB dB Equivalent Circuit Block Diagram Allowable power dissipation, Pd max - W Thermal resistance of heat sink, f - C/W Pd max - Ta Infinite heat sink Al heat sink Tightening torque 39 Nccm Silicon grease applied Thermal resistance between junction and outside air j-c 10C/W f - Sf Al heat sink t = 1.5 mm 2.5 No heat sink Ambient temperature, Ta - C Area of heat sink, Sf - cm2 No.1321-2/8 LA4261 Sample Application Circuit 1: Recommended Circuit Sample Application Circuit 2: Circuit with minimum number of external parts Unit (resistance: , capacitance: F) Sample Printed Circuit Pattern Unit (resistance: , capacitance: F) Description of External Parts C1, C4 100 F Feedback capacitor Decreasing the capacitance value lowers the low frequency response. Increasing the capacitance value makes the starting time later. Input short capacitor Reduces the high frequency noise when the input impedance is increased. Not required when the input impedance is decreased. Output capacitor Decreasing the capacitance value causes insufficient power at low frequencies. 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. 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. 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. 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. Resistor connected in series with oscillation blocking capacitor. Prevents phase shift attributable to the oscillation blocking capacitor so that oscillation is hard to occur. C2, C3 330 pF C5, C7 C6, C8 470 F 0.1 F polyester film capacitor 470 F C9 C10 100 F R1, R2 100 k R3, R4 3.3 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: , 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 Total harmonic distortion, THD - % THD - PO Output power, PO - W Input voltage, VIN - mV Output power, PO - W No.1321-4/8 LA4261 THD - f Total harmonic distortion, THD - % PO - f Output power, PO - W Frequency, f - Hz PO - VCC Frequency, f - Hz f Response Output power, PO - W Supply voltage, VCC - V ICC - PO Current dissipation, ICC - mA Response - dB Frequency, f - Hz Pd - PO Power dissipation, Pd - W Output power, PO - W ICCO - VCC Quiescent Quiescent current, ICCO - mA Pin voltage, Vpin - V Output power, PO - W Vpin - VCC 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 VNO - Rg Output noise voltage, VNO - mV FILTER 20 Hz to 20 kHz Vro - VCC Output ripple voltage, Vro - mV Signal source resistance, Rg - Vro - Vr Output ripple voltage, Vro - mV Supply voltage, VCC - V CT - f Ripple voltage, Vr - V ICCO - Ta Quiescent Quiescent current, ICCO - mA Voltage gain, VG - dB Crosstalk, CT - dB Frequency, f - Hz VG - RNF Ambient temperature, Ta - C f Response Total harmonic distortion, THD - % External resistance, RNF - THD - f Response - dB Frequency, f - Hz Frequency, f - Hz No.1321-6/8 LA4261 THD - VG Total harmonic distortion, THD - % Output noise voltage, VNO - mV VNO - VG FILTER 20 Hz to 20 kHz Voltage gain, VG - dB Vrp - VG Output ripple voltage, Vrp - mV Voltage gain, VG - dB Voltage gain, VG - dB No.1321-7/8 LA4261 Pop Noise Waveform at The Time of Power Switch ON (VCC = 16 V, RL = 8 , quiescent) Pop Noise Waveform at The Time of Power Switch OFF (VCC = 16 V, RL = 8 , quiescent) Pop noise waveform Pop noise waveform Middle point rise waveform Middle point fall waveform (VCC = 16 V, RL = 8 , THD = 5%) f = 1 kHz Clip waveform (VCC = 16 V, RL = 8 , THD = 5%) f = 10 kHz Clip waveform 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 |
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