Ordering number:ENN2660B
Monolithic Linear IC
LA4460N, 4461N
12W AF Power Amplifier for Car Radio, Car Stereo
Features
• High gain of 51dB typ. and high power output of 12W typ. • Possible to delete output and bootstrap capacitors, this encourages cost and space reductions due to external parts reduction. • Reduced external components (8 pieces recommended, 6 pieces minimum). • Almost no pop noises heard during power on or off operation. • Soft tonal quality in saturated power output. • Low distortion over low to high ranges of the audio frequencies. • Low residual noises (Rg=0). • Good operation conditions because of SIP (single ended pins) package having been employed for the LA4460N. • All pin terminal layouts of the LA4461N are reversed for easy stereo PC board pattern arrengement. • Two ground terminals for pre-amplifier and power amplifier are provided for easy PC board pattern arrangement and for stabilizing distortion chracteristics depending on signal source impedance. • Voltage gain is fixed at 51dB, however, lowering the gain is possible by adding a resistor. • IC is not damaged, if it is connected reversely. • Audio muting functions (AC mute & DC mute) are equipped. • Several protection circuits are installed, including : a. Thermal protection circuit. b. Overvoltage & surge voltage protection circuit. c. Load short-circuit current limiting protection circuit. d. Output pins DC short-circuit protection circuit. (grounding protection between OUT & GND, and speaker protection provided.)
Package Dimensions
unit:mm 3024A-SIP10H
[LA4460N, 4461N]
27.0 20.0 R1.7 4.0
7.0
1 1.4 0.5 2.54
10 2.07 0.4 2.0
SANYO : SIP10H
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 Company
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
21500TN (KT)/90196RM/D187KI, TS No.2660–1/12
1.0 min 6.0
11.8 13.2max
8.4
LA4460N, 4461N Specifications
Absolute Maximum Ratings at Ta = 25˚C
Parameter Maximum supply voltage Supply current Output current Surge supply voltage Allowable power dissipation Package thermal resistance Operating temperature Storage temperature Symbol VCC max1 VCC max2 I10peak I7, I9 peak Vsurge Pd max θj-c Topr Tstg Quiescent (30s) with signal Instantaneous value duty≤5%, pulse width≤1ms flow-in only Instantaneous value duty≤5%, pulse width≤1ms t≤0.2s Tc=75˚C, See Pd max – Ta graph. Conditions Ratings 25 18 4.5 4.5 50 25 3 –20 to +75 –40 to +150 Unit V V A A V W ˚C/W ˚C ˚C
Recommended Operating Conditions at Ta = 25˚C
Parameter Recommended supply voltage Load resistance Symbol VCC RL Conditions Ratings 13.2 4 to 8 Unit V Ω
Operating Characteristics at Ta = 25˚C, VCC=13.2V, RL=4Ω, f=1kHz, Rg=600Ω, with 100×100×1.5mm3 Al heat sink, See specified Test Circuit
Parameter Quiescent current Voltage gain Output power Total harmonic distortion Input resistance Output noise voltage Output offset voltage Muting attenuation (AC) Symbol ICCO VG PO THD ri VNO1 VNO2 Voff ATT Rg=0, f=20Hz to 20kHz, band-pass filter Rg=10kΩ, f=20Hz to 20kHz, band-pass filter –300 VO=0dBm, VM=9V 38 closed loop, at specified recommended circuit. THD=10% PO=1W 21 49 10 Conditions Ratings min typ 65 51 12 0.1 30 0.4 0.6 1.0 2.0 +300 1.0 max 120 53 Unit mA dB W % kΩ mV mV mV dB
(Note) : For DC muting, ATT=∞
No.2660–2/12
LA4460N, 4461N
Equivalent Circuit Block Diagram
Sample Application Circuit 1 : Recommended Circuit
No.2660–3/12
LA4460N, 4461N
Sample Application Circuit 2 : An Example with Minimum Parts
Functional Description on the External Parts Recommended number of the external parts for the LA4460N/4461N is 8 as shown in the Sample Application Circuit 1. Namely they are : · Feedback capacitors 2 pieces 4.7µF/6.3V×2 · Starting time adjustmant resistor 1 pieace 1.5kΩ · Oscillation compensation capacitor 1 piece 0.01µF · Oscillation compensation C · R 4 pieces 0.033µF×2, 4.7Ω×2 a) Feedback capacitor CNF This relates to a low range cutoff frequency fL, and fL lowers with increasing value of the ‘CNF and increases with decreasing CNF. b) Oscillation compensation capacitor CX Signals are applied from the non-inverted NF terminal to the inverted NF terminal through the two CNF capacitors. It is recommended to connect the oscillation compensation capacitor CX=0.01µF between the floating junction of the capacitors (minus side of CNF) and GND. As a rule a polyester film capacitor is recommended, but a ceramic type may be used if a PC board shows good circuit stability.
No.2660–4/12
LA4460N, 4461N
c) Starting time adjustment resistor RX The purpose of the RX is to adjust the starting time ts, and a resistor of 1.5kΩ is used. In this case, a rising DC locus as shown below will be obtained at the output terminals.
The circuit has been set to provide signals about 0.4µs. after the power is turned on. Though the ts will increase with decreasing RX, the total output across the load will be decreased, since the signal flowing to the non-inverted side will flow into the ground through the RX. Contrarily, increasing the RX to RX=∞ as shown in the Sample Application Circuit 2, the ts reduces to zero s., and the rising locus as shown below will be obtained.
d) Oscillation compensation CR across the load To prevent parasitic oscillation, it is recommended to connect 0.033µF plus 4.7Ω between each channel output terminal and GND. (As a rule the capacitor should be a polyester film capacitor.) This measure against the oscillation may be replaced with the methods as shown below, depending upon the stability of PC boards used. Note : · Check for oscillation at low temperatures. · Check for oscillation on stereo PC boards. · Do not use shielded wires for output cords.
Note : · Check for oscillation at low temperatures. · Use 8Ω load resistor. · Do not use shielded wires for output cords. · L should be higher than 0.3µH.
(Removal of oscillation compensation CR) Coil used Air core Inner diameter : 8ø Number of turns : 6 turns Wire size : UEW 1.5 Winding method : Solenoid (0.3µH) Above examples can be applied to the Sample Application Circuits 1, 2. Features of IC System and Roles of the Remaining Pin Terminals · Since a zero-bias design is introduced into the input circuit to keep the input potential at about zero by employing PNP in the input circuit, an input coupling capacitor can be removed for direct connection. However, when noises caused by a DC current flowing to a volume control circuit or the input circuit causes problems, connect a capacitor in series with the input circuit. · To prevent damage or deterioration of the IC due to the load short-circuited, a load short-circuit current limiting type protection circuit has been provided. However, when making the load short-circuit test, always mount the IC on the specified heat sink. · A circuit which prevents pop noise caused by the power on-off operation is also provided, thereby reducing the offset voltage and protecting speaker systems against damage. Continued on next page.
No.2660–5/12
LA4460N, 4461N
Continued from preceding page. · Soft clipping characteristics are accomplished by lowering the open loop voltage gain and reducing the amount of feedback to reduce undesired radiation to radio frequency circuits and to increase the circuit stability. The distortion deterioration resulted from the decreased amount of feedback will be avoided by using a unique distortion reduction circuit, thus 0.1% typ. will be assured. · A capacitor for oscillation compensation is included inside the IC as a method of reducing external parts. The capacitance is 30pF and this determines the cutoff frequency fH (–3dB point) of the high range (fH≈30kHz). · To reduce variations of the voltage gain, a feedback resistor RNF is also built-in, and the voltage gain is fixed to 51dB.
RNF=53Ω, Rf=20kΩ when RNF’=0 Rf VG=20log R (dB) NF when RNF’ is used VG=20log Rf RNF + RNF’ 2 (dB)
·
· ·
·
However the voltage gain will be decreased by adding a resistor RNF’, where the RNF’ is the resistor to be connected to the pin 4. (In the Sample Application Circuit 2, the gain adjustment will be made with the resistor connected to either pin 4 or 5.) Two ground pin terminals are provided, one for the preamplifier and the other for the power amplifier. Accordingly, stability of the IC is increased, especially, distortion deterioration phenomenon caused by increased signal source impedance Rg is improved and a flat response will be obtained. An overvoltage protector circuit is included to protect the IC from damage when a surge voltage is applied to the power line. The overvoltage is set at 25V, however, the circuit can resist 50V for giant pulse surge of 200ms. For OCL connections, a DC short-circuit protection circuit is required. Therefore a grounding protection circuit which endures against the OUTPUT-GND short-circuit is provided. Since consideration is given to the offset caused by shortcircuit or releasing the short-circuit both the speaker and the IC can be protected. When adding an audio muting circuit in each application circuit, refer to the illustration below. 6V≤VM≤VCC Recommended VM=9V ATT=38dB (Rg=600Ω)
Flow-in current IO is calculated as shown below. IO= VM – VBE R1
To increase muting attenuation, connect a resistor of 5.6kΩ in series with the input circuit, then the attenuation will be increased to 55dB. It should be noted that adding an input capacitor will increase pop noise when the AC muting is operated. Pop noise can be reduced by increasing the value of R1 and C1.
No.2660–6/12
LA4460N, 4461N
Pin Voltage (unit : V)
LA4460N LA4461N Function Quiescent pin voltage 1 10 AC Audio Muting 0 2 9 INPUT 0.06 3 8 Pre GND 0 4 7 NON INV NF 2.8 5 6 INV OUT 2.8 6 5 DC Audio Muting 5.6 7 4 INV OUT 6.6 8 3 Power GND 0 9 2 NON INV OUT 6.6 10 1 VCC 13.2
Much data on general characteristics are given for the Sample Application 1, but these data can be also applied to the Sample Application 2 because of no characteristic changed. However, the data on “Pop noise at power turned on”, “Starting time ts” and “DC muting” are shown for only the Sample Application 1. For the same characteristics to be applied to the Sample Application 2, refer to 1-C on page 4.
No.2660–7/12
LA4460N, 4461N
No.2660–8/12
LA4460N, 4461N
No.2660–9/12
LA4460N, 4461N
AC, DC Audio Muting Test Circuit
No.2660–10/12
LA4460N, 4461N
Sample Application Circuit 3 :
Note ) In case where the LA3161 is used, Rb and Cb must be changed. (Refer to the LA3161 catalog.)
Example of oscillation compensation where feedthrough capacitors and used at the output terminals.
Coil used : Air core Inner diameter : 8ø Number of turns : 6 turns Wire size : UEW 1.5 Winding method : solenoid (0.3µH) Connect each coil, L1 and L2, in series with each output terminal, where L1=L2.
No.2660–11/12
LA4460N, 4461N
Cy is a semiconductor ceramic capacitor (B.C.) of 0.5µF. Note on LA4460N/4461N Usage · Maximum ratings When the IC is used in the vicinity of the maximum ratings, a minor change in the conditions could result in exceeding the maximum ratings, and this may lead the IC to damege. Therefore sufficient precautions should be taken in this case. · Short-circuiting among pin terminals Damage or deterioration could result if the power is turned on with pins short-circuited. Therefore always make sure the pins are not bridged by solder, etc. when mounting the IC on the PC board and turn the power on. · Printed circuit board In designing a printed circuit board, refer to the foil pattern example attached. Also make sure no feedback loop exists between the input and output circuits. · Others The IC is an OCL type power IC in which a bridge connection is made. Care should be given to the ground connections of the test equipment so that the ground of the test equipment (VTVM, distortion analyzer, oscilloscope, etc.) connected to the output terminals are not commonly connected to those of the test equipment connected to the input terminals.
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 expor ted without obtaining the expor t 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 February, 2000. Specifications and information herein are subject to change without notice.
PS No.2660–12/12
