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Part: LA4905
Category:
Analog & Mixed-Signal Processing
Description: 17W, 2-channel BTL af High-efficiency Power Amplifier For Car Stereo System
Company: Sanyo Semiconductor Corporation
Datasheet: Download LA4905 datasheet File size : 355 kB
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Datasheet text preview:
Ordering number : EN5504
Monolithic Linear IC
LA4905
17-W, 2-Channel BTL AF High-Efficiency Power Amplifier for Car Stereo Systems
Overview
The LA4905 is a BTL 2-channel power amplifier IC for u s e in car audio systems. Increases in the number of external components are held to a minimum by adopting b o t h a signal-following type switching scheme in the a m p l i f i e r ' s output stage power supply, and a newlyd e v e l o p e d nonlinear amplifier that has nonlinear characteristics in the signal system. The power dissipation ( t h e r m a l loss) in the actual operating range has been reduced to about 1/2 that of earlier class B amplifier ICs. This contributes significantly to miniaturization of the heat sink and to reduction of heating within the set.
Package Dimensions
unit: mm 3160-SIP23HZ
[LC4905]
Features
· P o w e r dissipation reduced by 50% (When average music power is measured, and when compared to earlier Sanyo products.) · The number of required signal follower circuits has been reduced to a single circuit for two channels, allowing the number of external components to be reduced. · The output is a pure analog signal: no switching noise is output to the output lines. · Operates on an 8 to 18-V single-voltage power supply. · Full complement of built-in protection circuits (shorting to the power supply, shorting to ground, overvoltage, and thermal protection) · Built-in standby switch
SANYO: SIP23HZ
Specifications
Maximum Ratings at Ta = 25°C
Parameter Maximum supply voltage Maximum output current Allowable power dissipation Operating temperature Storage temperature Symbol VCC max1 VCC max2 IO Peak Pd max Topr Tstg (Per channel) With an arbitrarily large heat sink Conditions No input, t = 1 minute Ratings 24 18 4.5 37.5 35 to +85 40 to +150 Unit V V A W °C °C
Notes: 1. Set VCC and RL in the range where Pd max does not exceed 37.5 W. 2. The overvoltage protection circuit operates when VCC is 20 V or higher.
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN
83096HA (OT) No. 5504-1/10
LA4905 Operating Conditions at Ta = 25°C
Parameter Recommended supply voltage Allowable operating supply voltage range Recommended load resistance Recommended load resistance range Symbol VCC VCC op RL RL op Conditions Ratings 13.2 8 to 18 4 2 to 4 Unit V V
Notes: Set VCC and RL in the range where Pd max does not exceed 37.5 W.
Operating Characteristics at Ta = 25°C, VCC = 13.2 V, RL = 4 , f = 1 kHz, Rg = 600 , in the recommended circuit
Parameter Quiescent current Standby current Voltage gain Total harmonic distortion Output power 1 Output noise voltage Ripple rejection ratio Channel separation Input resistance Output offset voltage Standby on voltage Symbol Icco Ist VG THD PO1 PO2 VNO SVRR CHsep Ri VN offset VSTH Rg = 0 AMP = on, applied through a 10 k resistor VO = 0 dBm PO = 1W, LPF = 30 kHz THD = 10%, RL = 4 THD = 10%, RL = 2 Rg = 0, BPF = 20 Hz to 20 kHz Rg = 0, VCCR = 0 dBm, BPF = 20 Hz to 20 kHz Rg = 10 k, VO = 0 dBm, BPF = 20 Hz to 20 kHz 60 45 21 300 3 14 38 RL = , VIN = 0 Conditions min 80 typ 110 0 40 0.07 17 25 0.15 70 55 30 39 +300 VCC 0.3 max 150 10 42 0.2 Unit mA µA dB % W W mVrms dB dB k mV V
No. 5504-2/10
LA4905 LA4905 High-Efficiency Technology (1) Signal-following switching scheme The LA4905 adopts a switching regulator scheme in the power supply applied to the amplifier output stage. The LA4905 power dissipation is reduced significantly by having the output voltage of the switching regulator follow the input signal. Furthermore, in combination with the nonlinear amplifier scheme described below, the LA4905 design reduces the number of switching regulators to merely one circuit even though it is a BTL 2-channel amplifier. (See Figure 1.)
(2) Nonlinear amplifier The LA4905 adopts a nonlinear amplifier that has the n o n l i n e a r characteristics shown in Figure 2 in the amplifier signal system. This scheme does not use the c e n t e r point voltage of 1/2 VCC used in normal amplifiers, but instead uses a voltage about 2 V lower. This allows the design to dispense with the lower side switching regulator. This nonlinear amplifier has a structure based on a d i f f e r e n t i a l amplifier that has symmetric negative f e e d b a c k circuits. Although the BTL output stage positive and negative phase output waveform is a halfwave waveform that is expanded and compressed as shown in Figure 3, the combined output waveform at the negative load terminal is identical to that output by earlier products.
No. 5504-3/10
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