Monolithic Linear LA4905 17-W, 2-Channel High-Efficiency Pow

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Monolithic Linear LA4905 17-W, 2-Channel High-Efficiency Pow

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Ordering number EN5504
Monolithic Linear
LA4905
17-W, 2-Channel High-Efficiency Power Amplifier Stereo Systems
Overview
LA4905 2-channel power amplifier audio systems. Increases number external components held minimum adopting both signal-following type switching scheme amplifier's output stage power supply, newlydeveloped nonlinear amplifier that nonlinear characteristics signal system. power dissipation (thermal loss) actual operating range been reduced about that earlier class amplifier ICs. This contributes significantly miniaturization heat sink reduction heating within set.
Package Dimensions
unit: 3160-SIP23HZ
[LC4905]
Features
Power dissipation reduced (When average music power measured, when compared earlier Sanyo products.) number required signal follower circuits been reduced single circuit channels, allowing number external components reduced. output pure analog signal: switching noise output output lines. Operates 18-V single-voltage power supply. Full complement built-in protection circuits (shorting power supply, shorting ground, overvoltage, thermal protection) Built-in standby switch
SANYO: SIP23HZ
Specifications
Maximum Ratings 25°C
Parameter Maximum supply voltage Maximum output current Allowable power dissipation Operating temperature Storage temperature Symbol max1 max2 Peak Topr Tstg (Per channel) With arbitrarily large heat sink Conditions input, minute Ratings 37.5 +150 Unit
Notes: range where does exceed 37.5 overvoltage protection circuit operates when higher.
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, Chome, Ueno, Taito-ku, TOKYO, JAPAN
83096HA (OT) 5504-1/10
LA4905 Operating Conditions 25°C
Parameter Recommended supply voltage Allowable operating supply voltage range Recommended load resistance Recommended load resistance range Symbol Conditions Ratings 13.2 Unit
Notes:Set range where does exceed 37.5
Operating Characteristics 25°C, 13.2 kHz, recommended circuit
Parameter Quiescent current Standby current Voltage gain Total harmonic distortion Output power Output noise voltage Ripple rejection ratio Channel separation Input resistance Output offset voltage Standby voltage Symbol Icco SVRR CHsep offset VSTH applied through resistor 10%, 10%, VCCR dBm, dBm, -300 Conditions 0.07 0.15 +300 Unit mVrms
5504-2/10
LA4905 LA4905 High-Efficiency Technology Signal-following switching scheme LA4905 adopts switching regulator scheme power supply applied amplifier output stage. LA4905 power dissipation reduced significantly having output voltage switching regulator follow input signal. Furthermore, combination with nonlinear amplifier scheme described below, LA4905 design reduces number switching regulators merely circuit even though 2-channel amplifier. (See Figure
Nonlinear amplifier LA4905 adopts nonlinear amplifier that nonlinear characteristics shown Figure amplifier signal system. This scheme does center point voltage used normal amplifiers, instead uses voltage about lower. This allows design dispense with lower side switching regulator. This nonlinear amplifier structure based differential amplifier that symmetric negative feedback circuits. Although output stage positive negative phase output waveform halfwave waveform that expanded compressed shown Figure combined output waveform negative load terminal identical that output earlier products.
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LA4905 Equivalent Circuit Block Diagram
Voltages 13.2 applied STBY through 10-k resistor, using digital voltmeter
voltage 1.36 Pre-GND 1.36 BEEP 1.36 PWR-GND -OUT1 2.03 +OUT1 2.03 13.0
voltage
3.92
13.2
(SW) 13.2
3.70
3.70
3.73
SW-GND
voltage
+OUT 2.03
-OUT 2.03
PWR-GND
12.1
STAND-BY 3.21
ON-TIME 2.81
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LA4905 Sample Printed Circuit Board Pattern
External Component Functions Input capacitors; recommended value: Note that low-frequency band adjusted changing values since depends their value, although value must exceed (when noise considerations. Beep amplifier input capacitor. same value that used Connect beep amplifier PRE-GND through beep function used. Amplifier power-on delay time setting capacitor; recommended value: recommended value, amplifier will turn about second after power applied. delay time proportional capacitance arbitrary value. However, value larger should used noise considerations. Oscillation prevention capacitors. capacitors with excellent temperature characteristics such polyester film Mylar capacitors. These capacitors function conjunction with recommend using capacitors larger, since stability varies somewhat depending printed circuit board layout. Decoupling capacitor (ripple filter) Power-supply capacitor Switching regulator oscillation prevention capacitor; recommended value: 1500 Switching regulator output smoothing capacitor. LA4905 adopts self-excitation switching regulator scheme. Since this capacitor influences stability self-excitation regulator efficiency, there optimal value. recommend 2.2-µF, 25-V capacitor with good temperature characteristics. Note that 2.2-, 1/2-W resistor should used same reason. Standby switch current limiting resistor; recommended value: (When voltage applied standby switch between 13.2 Note that this resistor cannot removed. section "Standby Function" elsewhere this document. External switching transistor. recommend using 2SD1668 rank 2SD1667 rank used application designed handle loads (RL). heat sink must provided along with that Flywheel diode that takes coil energy. recommend using SB40-05J, which Schottky barrier diode with SB10-05A2 used application designed handle loads (RL). joint heat sink required. recommend HP-022Z 180-µH coil manufactured Tokin, Ltd. 200-µH HP-011Z used application designed handle loads (RL).
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LA4905 Internal Characteristics Usage Notes Switching Regulator reduce power dissipation, LA4905 includes signal-following type switching regulator. When there input signal, self-excited oscillator operates about kHz. desirable amplifier block separated possible from tuner block prevent interference from extraneous radiation within set. Also, when designing printed circuit board layout, pattern lines switching regulator components should made short broad possible. prevent degradation characteristics LA4905 itself, separation between switching regulator components input block (the input block pattern, input capacitors, beep capacitor) should least Standby Function standby switch pin. amplifier turned applying voltage about higher through external resistor (R1). value must determined, using following formula, that influx current remains under voltage excess 13.2 volts applied standby switch voltage. applied voltage BEEP (pin BEEP used, value R102 shown figure that under small possible prevent degradation output noise voltage (VNO). Protection Circuits LA4905 includes built-in thermal protection circuit prevent destruction degradation generates abnormal amounts heat. thermal protection circuit controls that output gradually lowered junction temperature (Tj) increases about 160°C insufficient heat sink other reason. overvoltage protection circuit operates voltage exceeds value about volts. Although LA4905 includes on-chip protection circuit shorts shorts ground, does include load shorted protection circuit. idea behind this design that thermal protection circuit will protect against load shorting. However, since load shorting also cause heating external transistors coils, designs should take load shorting into consideration. Other Notes pin, connected within package.
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LA4905
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LA4905
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LA4905
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LA4905
products described contained herein intended surgical implants, life-support systems, aerospace equipment, nuclear power control systems, vehicles, disaster/crime-prevention equipment like, failure which directly indirectly cause injury, death property loss. Anyone purchasing products described contained herein above-mentioned shall: Accept full responsibility indemnify defend SANYO ELECTRIC CO., LTD., affiliates, subsidiaries distributors their officers employees, jointly severally, against claims litigation damages, cost expenses associated with such use: impose responsibility fault negligence which cited such claim litigation SANYO ELECTRIC CO., LTD., affiliates, subsidiaries distributors their officers employees jointly severally. Information (including circuit diagrams circuit parameters) herein example only; guaranteed volume production. SANYO believes information herein accurate reliable, guarantees made implied regarding infringements intellectual property rights other rights third parties. This catalog provides information August, 1996. Specifications information herein subject change without notice.
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Monolithic Linear LA4905 17-W, 2-Channel High-Efficiency Pow

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