Ordering number: EN3848D Monolithic Linear IC LA4705 15 W 2-channel BTL AF Power Amplifier for Car Stereos Overview Package Dimensions The LA4705 is a BTL two-channel power IC for car audio and radio-cassette players 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 LA4705 provides powerful bass and clear treble. In addition, the LA4705 features on-chip protectors and standby switch. unit: mm 3109-SIP18H [LA4705] Features . High power: supports total output of 25 W + 25 W = 14.4 V, THD = 30%, R = 4 Ω) . (VLess pop . Designed noise for excellent sound quality (f < 10 Hz, f = 130 kHz) . Any on time settable by external capacitor . Standby switch circuit on chip (microprocessor supported) . Various protectors on chip CC L . . L SANYO : SIP18H H (output-to-ground short/output-to-VCC short/ load short/overvoltage/thermal shutdown circuit) NF capacitorless Supports RL = 2 Ω Specifications Maximum Ratings at Ta = 25°C Parameter Maximum supply voltage Surge supply voltage Allowable power dissipation Symbol VCC max 1 Conditions Ratings Unit No signal, t = 60 s 24 V VCC max 2 With signal 18 V VCC surge t % 0.2 s, single giant pulse 50 V 37.5 W Pd max Arbitrarily large heat sink Operating temperature Topr –35 to +85 °C Storage temperature Tstg –40 to +150 °C * Set VCC, RL in a range that does not exceed Pd max = 37.5 W SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN D3096HA(II)/12693TS/4152TS No.3848-1/8 LA4705 Operating Conditions at Ta = 25°C Parameter Symbol Recommended supply voltage Operating voltage range Conditions Ratings VCC VCC op Recommended load resistance Range where Pd max is not exceeded Unit 13.2 V 9 to 18 V 4 Ω RL Operating Characteristics at Ta = 25°C, VCC = 13.2 V, RL = 4 Ω, f = 1 kHz, Rg = 600 Ω Output power Allowable power dissipation, Pd max – W Output offset voltage Output noise voltage Ripple rejection ratio Channel separation Input resistance Standby pin applied voltage Symbol ICCO Ist VG THD PO1 PO2 PO3 VN offset VNO SVRR CHsep ri Vst Conditions min 80 38 PO = 1 W THD = 10% THD = 10%, VCC = 14.4 V THD = 10%, RL = 2 Ω Rg = 0 Rg = 0, B.P.F. = 20 Hz to 20 kHz Rg = 0, fR = 100 Hz, VR = 0 dBm Rg = 10 kΩ, VO = 0 dBm 11 Pd max – Ta Arbitrarily large heat sink Ambient temperature, Ta – °C typ 115 10 40 0.1 15 18 16 –300 40 50 21 2.5 Amp on, applied through 10 kΩ Heat sink thermal resistance, θf – °C/W Parameter Quiescent current Standby current Voltage gain Total harmonic distortion 0.1 50 60 30 max 250 60 42 0.4 +300 0.5 39 VCC Unit mA µA dB % W W W mV mVrms dB dB kΩ V θf – Sf Al heat sink, t = 1.5 mm Tightening torque 39 Nccm With silicone grease applied Heat sink area, Sf – cm2 No.3848 -2/8 LA4705 Features and Usage Notes . Pin 5 is the standby switch pin. The amplifier is turned on by applying approximately 2 V or more to this pin through an resistor (R1). The current flowing into pin 5 is 500 µA or less. . external Pin 6 is the mute pin. The amplifier on time can be set as desired through C3. By grounding pin 6, the amplifier can implement operation. In this case, the recovery time depends on C3. . mute In order to prevent damage or degradation which may be caused by abnormally heated IC, the LA4705 has a thermal shutdown . protector. Accordingly, in the case of inadequate heat dissipation, the thermal shutdown protector will operate to control the output gradually into attenuation. Also be fully careful of handling other protectors built in the LA4705. Sample Application Circuit Unit (resistance: Ω, capacitance: F) No.3848 -3/8 LA4705 Sample Print Pattern Copper foil area 90 × 105 mm2 Description of External Components C1, C4 Input capacitors 2.2 µF is recommended. fL can be varied by C1, C4 capacitances to adjust the bass range. C2 Decoupling capacitor (ripple filter) C3 Amplifier on time setting capacitor C5 Power supply capacitor C6, C7, C8, C9 Oscillation blocking capacitors Use polyester film capacitors (Mylar capacitors) with good temperature characteristics. (R2, R3, R4, and R5 used jointly.) Since stability may be affected slightly by the pattern layout, etc., 0.1 µF or more is recommended. R1 Standby switch current limiting resistor 10 kΩ is recommended. This resistor cannot be removed. Approximately 0.6 to 0.7 second for 33 µF. Since the on time is proportional to this capacitance, it can be set as desired by varying this capacitance. The amplifier can implement mute operation by setting C3 to GND potential. No.3848 -4/8 LA4705 PO – VCC Output power, PO – W Output power, PO – W PO – VIN Supply voltage, VCC – V THD – PO Output power, PO – W Total harmonic distortion, THD – % Input level, VIN – Vrms PO – VCC Output power, PO – W THD – PO Total harmonic distortion, THD – % Total harmonic distortion, THD – % Supply voltage, VCC – V THD – PO Total harmonic distortion, THD – % Output power, PO – W THD – f Output power, PO – W f Response Response – dB 0 dBm = VG 40 dB Input frequency, f – Hz Input frequency, f – Hz No.3848 -5/8 LA4705 PO – f Output power, PO – W Channel separation, CHsep – dB CH sep – f Input frequency, f – Hz SVRR – f Ripple rejection ratio, SVRR – dB Ripple rejection ratio, SVRR – dB Input frequency, f – Hz SVRR – VCC Ripple frequency, f – Hz VNO – Rg Input resistance, Rg – Ω Pd, ICC – PO Current drain, ICC – A Power dissipation, Pd – W Power dissipation, Pd – W Power supply ripple voltage, VCCR – Vrms Pd, ICC – PO Output power, PO – W Package allowed power dissipation Current drain, ICC – A Ripple rejection ratio, SVRR – dB Output noise voltage, VNO – mVrms Supply voltage, VCC – V SVRR – VCCR Output power, PO – W No.3848 -6/8 LA4705 Pd, ICC – PO ICCO – VCC Current drain, ICC – A Quiescent current, ICCO – mA Power dissipation, Pd – W No load Output power, PO – W VN – VCC Supply voltage, VCC – V ICCO – Ta Output pin voltage, VN – V Quiescent current, ICCO – mA No load Ambient temperature, Ta – °C THD – Ta Output power, PO – W Total harmonic distortion, THD – % Supply voltage, VCC – V PO – Ta Ambient temperature, Ta – °C VN – VST Amp ON time – s Output pin voltage, VN – V Ambient temperature, Ta – °C Amp ON time – C4 Unit (resistance: Ω) C4 – µF Standby pin applied voltage, VST – V No.3848 -7/8 LA4705 AC Level BTL output DC locus Locus when ON BTL output DC locus AC Level Locus when OFF 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 December, 1996. Specifications and information herein are subject to change without notice. No.3848 -8/8