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Ordering number: EN3848D
Monolithic Linear IC
LA4705
15 W 2-channel BTL AF Power Amplifier for Car Stereos
Overview
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.
Package Dimensions
unit: mm
3109-SIP18H
[LA4705]
Features
. High power: supports total output of 25 W + 25 W = . (V pop14.4 V, THD = 30%, R = 4 ) Less . 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 H
SANYO : SIP18H
. .
(output-to-ground short/output-to-VCC short/ load short/overvoltage/thermal shutdown circuit) NF capacitorless Supports RL = 2
Specifications
Maximum Ratings at Ta = 25C
Parameter Maximum supply voltage Surge supply voltage Allowable power dissipation Operating temperature Storage temperature Symbol VCC max 1 VCC max 2 VCC surge Pd max Topr Tstg With signal t % 0.2 s, single giant pulse Arbitrarily large heat sink Conditions No signal, t = 60 s Ratings 24 18 50 37.5 -35 to +85 -40 to +150 Unit V V V W C C
* Set VCC, RL in a range that does not exceed Pd max = 37.5 W
Any and all SANYO products described or contained herein do not have specifications that can handle applications that require extremely high levels of reliability, such as life-support systems, aircraft's control systems, or other applications whose failure can be reasonably expected to result in serious physical and/or material damage. Consult with your SANYO representative nearest you before using any SANYO products described or contained herein in such applications. SANYO assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all SANYO products described or contained herein.
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
D3096HA(II)/12693TS/4152TS No.3848-1/8
LA4705
Operating Conditions at Ta = 25C
Parameter Recommended supply voltage Operating voltage range Recommended load resistance Symbol VCC VCC op RL Range where Pd max is not exceeded Conditions Ratings 13.2 9 to 18 4 Unit V V
Operating Characteristics at Ta = 25C, VCC = 13.2 V, RL = 4 , f = 1 kHz, Rg = 600
Parameter Quiescent current Standby current Voltage gain Total harmonic distortion Output power 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 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 Amp on, applied through 10 k 11 typ 115 10 40 0.1 15 18 16 0.1 50 60 30 max 250 60 42 0.4 Unit mA A dB % W W W mV mVrms dB dB k V
-300 40 50 21 2.5
+300 0.5
39 VCC
Allowable power dissipation, Pd max - W
Heat sink thermal resistance, f - C/W
Pd max - Ta
Arbitrarily large heat sink
f - Sf
Al heat sink, t = 1.5 mm Tightening torque 39 Nccm With silicone grease applied
Ambient temperature, Ta - C
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 is 500 A or less. . external the mute(R1). The current flowing into pin 5set as desired through C3. By grounding pin 6, the amplifier can implement Pin 6 is pin. The amplifier on time can be C3. . mute operation. In this case,orthe recovery time dependsbeoncaused by abnormally heated IC, the LA4705 has a thermal shutdown In order to prevent damage degradation which may .
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: , capacitance: F)
No.3848-3/8
LA4705
Sample Print Pattern
Copper foil area 90 x 105 mm2
Description of External Components
C1, C4 C2 C3 Input capacitors Decoupling capacitor (ripple filter) Amplifier on time setting capacitor Power supply capacitor 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 F or more is recommended. 10 k is recommended. This resistor cannot be removed. Approximately 0.6 to 0.7 second for 33 F. 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. 2.2 F is recommended. fL can be varied by C1, C4 capacitances to adjust the bass range.
C5 C6, C7, C8, C9
R1
Standby switch current limiting resistor
No.3848-4/8
LA4705
PO - VIN PO - VCC
Output power, PO - W
Input level, VIN - Vrms PO - VCC
Output power, PO - W
Supply voltage, VCC - V THD - PO
Supply voltage, VCC - V THD - PO
Total harmonic distortion, THD - %
Output power, PO - W
Output power, PO - W THD - PO
Total harmonic distortion, THD - %
Output power, PO - W THD - f
Total harmonic distortion, THD - %
Output power, PO - W f Response
0 dBm = VG 40 dB
Total harmonic distortion, THD - %
Input frequency, f - Hz
Response - dB
Input frequency, f - Hz No.3848-5/8
LA4705
CH sep - f PO - f
Channel separation, CHsep - dB
Output power, PO - W
Input frequency, f - Hz SVRR - VCC
Input frequency, f - Hz SVRR - f
Ripple rejection ratio, SVRR - dB
Ripple rejection ratio, SVRR - dB
Supply voltage, VCC - V SVRR - VCCR
Ripple frequency, f - Hz VNO - Rg
Output noise voltage, VNO - mVrms
Ripple rejection ratio, SVRR - dB
Power supply ripple voltage, VCCR - Vrms Pd, ICC - PO
Input resistance, Rg - Pd, ICC - PO
Power dissipation, Pd - W
Current drain, ICC - A Power dissipation, Pd - W
Output power, PO - W
Output power, PO - W No.3848-6/8
Current drain, ICC - A
Package allowed power dissipation
LA4705
Pd, ICC - PO
No load
ICCO - VCC
Output power, PO - W VN - VCC
No load
Quiescent current, ICCO - mA
Power dissipation, Pd - W
Current drain, ICC - A
Supply voltage, VCC - V ICCO - Ta
Supply voltage, VCC - V PO - Ta
Quiescent current, ICCO - mA
Output pin voltage, VN - V
Ambient temperature, Ta - C THD - Ta
Ambient temperature, Ta - C Amp ON time - C4
Total harmonic distortion, THD - %
Output power, PO - W
Ambient temperature, Ta - C VN - VST
Output pin voltage, VN - V
Amp ON time - s
Unit (resistance: )
C4 - F
Standby pin applied voltage, VST - V No.3848-7/8
LA4705
BTL output DC locus AC Level
Locus when ON BTL output DC locus AC Level
Locus when OFF
Specifications of any and all SANYO products described or contained herein stipulate the performance, characteristics, and functions of the described products in the independent state, and are not guarantees of the performance, characteristics, and functions of the described products as mounted in the customer's products or equipment. To verify symptoms and states that cannot be evaluated in an independent device, the customer should always evaluate and test devices mounted in the customer's products or equipment. SANYO Electric Co., Ltd. strives to supply high-quality high-reliability products. However, any and all semiconductor products fail with some probability. It is possible that these probabilistic failures could give rise to accidents or events that could endanger human lives, that could give rise to smoke or fire, or that could cause damage to other property. When designing equipment, adopt safety measures so that these kinds of accidents or events cannot occur. Such measures include but are not limited to protective circuits and error prevention circuits for safe design, redundant design, and structural design. In the event that any or all SANYO products(including technical data,services) described or contained herein are controlled under any of applicable local export control laws and regulations, such products must not be exported without obtaining the export license from the authorities concerned in accordance with the above law. No part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying and recording, or any information storage or retrieval system, or otherwise, without the prior written permission of SANYO Electric Co., Ltd. Any and all information described or contained herein are subject to change without notice due to product/technology improvement, etc. When designing equipment, refer to the "Delivery Specification" for the SANYO product that you intend to use. 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. PS No.3848-8/8

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