* 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 Package Dimensions 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. 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 Ω) ⋅ 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 Symbol Conditions VCC max VCC surge f ≤ 0.2 s, single giant pulse Ratings Unit 18 V 50 V Maximum output current IO peak Per channel 3.0 A Allowable power disspation Pd max With arbitrarily large heat sink 32 W Operating temperature Topr –35 to +85 ˚C Storage temperature Tstg –40 to +150 ˚C Ratings Unit Recommended Conditions at Ta = 25 ˚C Parameter Recommended supply voltage Operating voltage range Recommended load resistance Symbol Conditions VCC VCC op RL op Range where Pd max is not exceeded 13.2 V 9 to 16 V 4 Ω 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 kΩ, f = 1 kHz, Rg = 600 Ω Parameter Symbol Quiescent current Conditions ICCO Standby current IST Voltage gain VG Total harmonic distortion Output power Output offset voltage Rg=0 Ratings min 70 38 THD PO=1 W PO1 RL=4 Ω, THD=10 %, VCC=13.2 V PO2 PO3 VN offset max 125 250 mA 10 60 µA 40 42 dB 0.06 0.2 W RL=4 Ω, THD=10 %, VCC=14.4 V 20 W RL=4 Ω, THD=30 %, VCC=14.4 V 30 –300 VNO Rg=0, B.P.F.=20 Hz to 20 kHz Ripple rejection ratio SVRR Rg=0, fR=100 Hz, VR=0 dBm 40 50 Channel separation Chsep Rg=10 kΩ, VO=0 dBm 50 60 21 30 Standby pin applied voltage Vst Allowable power dissipation, Pd max — W Ri 35 32 30 25 20.8 20 15 13.9 10.4 10 5 3.1 Amp on, applied through 10 kΩ 0.1 2.5 W +300 Output noise voltage Input resistance % 17 Rg=0 13 Unit typ 0.5 mV mVrms dB dB 39 VCC kΩ V Pd max — Ta Arbitrarily large heat sink θjc=2.0˚C/W θf=3˚C/W θf=4˚C/W θf=7˚C/W θf=10˚C/W No fin 0 –20 0 20 40 60 80 100 120 140 160 Ambient temperature, Ta — ˚C No.5715-2/3 LA4725 Block Diagram and Sample Application Circuit 100 µF/16V + VCC + C5 2 14 Output pin-to-VCC short protector Ripple filter Predriver 13 Power ** + C1 + 1 2.2 µF/6V – Load short protector IN Predriver 12 ** 11 Power OUT1 BIAS circuit R1 OFF ON 10kΩ 4 Overvoltage/ surge protector Standby SW Thermal shutdown VCC Predriver Output pin-to-GND short protector OUT2 9 Power + + – Load short protector IN Power 10 GND2 ** Predriver 8 Power – C8 0.1 µF R4 2.2Ω R5 2.2Ω C9 0.1 µF OUT2 RL 4Ω + Output pin-to-VCC short protector Pop noise prevention circuit 5 + 33 µF/6V + ** (Polyester film capacitor) ** 6 2.2 µF/6V RL 4Ω Output pin-to-GND short protector +5V C4 IN2 – C6 0.1 µF R2 2.2Ω R3 2.2Ω C7 0.1 µF OUT1 3 2200 µF 7 + C3 0.47 µF/6V 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