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| Ordering number : EN 5715 * Monolithic Linear IC LA4725 2-Channel BTL Power Amplifier (30 W+30 W) with Standby Switch for Car Stereos Preliminary Overview The LA4725 is a BTL two-channel power IC for car audios developed in pursuit of excellent sound quality. Low-region frequency characteristics have been improved through the use of a new NF capacitorless circuit, and crosstalk which causes "muddy" sound has been reduced by improving both circuit and pattern layout. As a result the LA4725 provides powerful bass and clear treble. Package Dimensions unit: mm 3113A-SIP14HZ [LA4725] Features High power: supports total output of 30 W+30 W. [EIAJ power] (VCC=14.4 V, THD=30 %, RL=4 ) Less pop noise. Designed for excellent sound quality. (fL<10 Hz, fH=130 kHz) Any rise time settable by an external capacitor. Standby switch circuit on chip. (microcontroller supported) Various protectors on chip. (output-to-ground short/ output-to-VCC short/ load short/ overvoltage/ thermal shutdown circuit) The LA4725 is pin-compatible with the LA4728. SANYO: SIP14HZ Specifications Maximum Ratings at Ta = 25 C Parameter Maximum supply voltage Surge supply voltage Maximum output current Allowable power disspation Operating temperature Storage temperature Symbol VCC max VCC surge f 0.2 s, single giant pulse IO peak Pd max Topr Tstg Per channel With arbitrarily large heat sink Conditions Ratings 18 50 3.0 32 -35 to +85 -40 to +150 Unit V V A W C C Recommended Conditions at Ta = 25 C Parameter Recommended supply voltage Operating voltage range Recommended load resistance Symbol VCC VCC op RL op Range where Pd max is not exceeded Conditions Ratings 13.2 9 to 16 4 Unit V V SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN 32497RM(KOTO) No.5715-1/3 LA4725 Operating Characteristics at Ta = 25 C, VCC = 13.2 V, RL = 4 k, f = 1 kHz, Rg = 600 Parameter Quiescent current Standby current Voltage gain Total harmonic distortion Symbol ICCO IST VG THD PO1 Output power PO2 PO3 Output offset voltage Output noise voltage Ripple rejection ratio Channel separation Input resistance Standby pin applied voltage VN offset VNO SVRR Chsep Ri Vst Amp on, applied through 10 k PO=1 W RL=4 , THD=10 %, VCC=13.2 V RL=4 , THD=10 %, VCC=14.4 V RL=4 , THD=30 %, VCC=14.4 V Rg=0 Rg=0, B.P.F.=20 Hz to 20 kHz Rg=0, fR=100 Hz, VR=0 dBm Rg=10 k, VO=0 dBm 40 50 21 2.5 -300 0.1 50 60 30 39 VCC 13 38 Rg=0 Conditions Ratings min 70 typ 125 10 40 0.06 17 20 30 +300 0.5 max 250 60 42 0.2 Unit mA A dB % W W W mV mVrms dB dB k V Allowable power dissipation, Pd max -- W 35 32 30 Pd max -- Ta Arbitrarily large heat sink f=3C/W f=4C/W f=7C/W f=10C/W jc=2.0C/W 25 20.8 20 15 13.9 10.4 10 5 3.1 No fin 0 20 40 60 80 100 120 140 160 0 -20 Ambient temperature, Ta -- C No.5715-2/3 LA4725 Block Diagram and Sample Application Circuit + 100 F/16V + C5 2 14 VCC 2200 F Ripple filter Predriver + C1 1 2.2 F/6V + - Output pin-to-VCC short protector Power Load short protector Predriver Power Output pin-to-GND short protector ** (Polyester film capacitor) Output pin-to-GND short protector 9 ** Load short protector Predriver Power Output pin-to-VCC short protector Power 10 GND2 ** 8 OUT2 13 ** OUT1 - RL 4 IN 12 ** 11 C6 0.1 F R2 2.2 R3 2.2 C7 0.1 F OUT1 + 3 BIAS circuit Overvoltage/ surge protector VCC R1 OFF ON 10k 4 +5V + C4 IN2 Standby SW Thermal shutdown Predriver + - Power - 6 2.2 F/6V IN C8 0.1 F R4 2.2 R5 2.2 C9 0.1 F OUT2 RL 4 + Pop noise prevention circuit 5 + 33 F/6V + C3 0.47 F/6V 7 C10 A07429 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 lose. Anyone purchasing any products described or contained herein for an above-mentioned use shall: 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: Not impose any responsibilty 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 March, 1997. Specifications and information herein are subject to change without notice. No.5715-3/3 |
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