LA4742

Ordering number : ENN7043 Monolithic Linear IC LA4742 45 W Four-Channel (Bridge Circuit) Power Amplifier Overview The LA4742 is a 45 W 4-channel power amplifier IC for car stereo systems. It features a built-in bridge circuit and the ability to radically reduce the number of external components required. Package Dimensions unit: mm 3236-HZIP25 [LA4742] 29.2 25.6 4.5 Features • Maximum output power: 45 W × 4 channels (VCC = 14.4 V, 4 Ω load, 1 kHz) • 40 W × 4 channels (VCC = 13.7 V, 4 Ω load, 1 kHz) • Requires only seven external components and does not require an oscillation prevention RC circuit, a noise filter, or a BS capacitor. R1.7 14.4 17.4 3.3 10.2 0.4 4.0 4.0 Functions • Output offset detection function (DDL) • Warning tone (beep) generation function • Muting function • Built-in standby switch • Full complement of built-in protection circuits, including protection from shorting to VCC, shorting to ground, load shorting, overvoltages, and overheating. • Maximum supply voltage before damage in the open ground state: 16 V 2.60 2.0 (1.0) 2.0 0.53 SANYO: HZIP25 Specifications Maximum Ratings at Ta = 25°C Parameter Maximum supply voltage Maximum output current Allowable power dissipation Operating temperature Storage temperature Package thermal resistance Symbol VCC max1 VCC max2 IOpeak Pd max Topr Tstg θjc With an arbitrarily large heat sink Signal present No signal (for 1 minute) Conditions Ratings 18 26 4.5/ch 50 –40 to +85 –40 to +150 1 Unit V V A W °C °C °C/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 Company TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN 92101TN (OT) No. 7043-1/9 LA4742 Operating Conditions at Ta = 25°C Parameter Recommended supply voltage Recommended load resistance Operating supply voltage range Symbol VCC RL VCC op Conditions Ratings 14.4 4 9 to 18 Unit V Ω V Operating Characteristics at Ta = 25°C, VCC = 14.4 V, f = 1 kHz, RL = 4 Ω, Rg = 600 Ω Parameter Quiescent current Standby current Output offset voltage Voltage gain Voltage gain difference Symbol ICCO Ist VNoffset VG ∆VG PO1 Output power PO max1 PO max2 Total harmonic distortion Channel separation Ripple rejection ratio Output noise voltage Muting attenuation THD CHsep SVRR VNO Mute(att) THD = 10 % VCC = 13.7 V, VIN = 5 Vrms VIN = 5 Vrms PO = 4 W VO = 0 dBm, Rg = 10 kΩ fr = 100 Hz, VR = 0 dBm, Rg = 0 Rg = 0, B.P.F. = 20 Hz to 20 kHz VO = 20 dBm 70 55 50 RL = ∞, Rg = 0 Vst = 0 V Rg = 0 VO = 0 dBm –100 25 –1 23 28 40 45 0.05 65 60 100 80 200 0.4 26 Conditions Ratings min 100 typ 200 max 350 10 +100 27 +1 Unit mA µA mV dB dB W W W % dB dB µVrms dB No. 7043-2/9 LA4742 Sample Application Circuit and Block Diagram 2200µF VCC1/2 6 IN 1 + 11 + 20 + 9 VCC3/4 + 0.022µF OUT 1+ 0.22µF +5V 10kΩ 25 Clip Detect Circuit – – 7 OUT 1– PWR GND 1 CLIP DET Protective Circuit 8 – IN 2 + 5 OUT 2+ + 12 + – 3 0.22µF Aux Circuit ST BY 4 +5V ST ON R.F 47µF IN 3 + 15 0.22µF AUX IN + 1 – + 17 + 10 Stand by Switch Ripple Filter Mute Circuit 2 OUT 2– PWR GND 2 Mute 22 3.3µF OUT 3+ + 10kΩ Low Level Mute ON + – 19 0.22µF PRE GND 13 Protective Circuit 18 OUT 3– PWR GND 3 – IN 4 + 14 0.22µF ON TIME C 16 + 22µF Muting & ON Time Control Circuit + 21 OUT 4+ + – 23 OUT 4– PWR GND 4 24 Top view A13765 No. 7043-3/9 LA4742 Pin Functions and Equivalent Circuits at VCC = 14.4 V, ST-BY = 5 V Pin No. 1 2 8 18 24 VCC 130 Ω Function AUX IN DC voltage [V] Notes Internal equivalent circuit POWER GND 3 5 7 9 17 19 21 23 –OUT2 +OUT2 –OUT1 +OUT1 +OUT3 –OUT3 +OUT4 –OUT4 130 Ω Lowsaturation voltage circuit 3 5 7 9 17 19 21 23 A13766 2.7 10 kΩ 4 4 ST-BY • The amplifier will be on when the applied voltage is between 2 V and VCC. 30 kΩ 1.5 kΩ A13767 6 20 VCC1/2 VCC3/4 Bias circuit ST-BY power supply line Input amplifier ST-BY power supply line 10 SVR 13.2 • Low ripple power supply line for all internal IC blocks VCC 200 Ω 200 Ω 1 kΩ 10 A13768 Continued on next page. No. 7043-4/9 LA4742 Continued from preceding page. Pin No. Function DC voltage [V] Notes Input amplifier ST-BY power supply line Internal equivalent circuit 5 pF 11 12 14 15 IN1 IN2 IN4 IN3 11 12 14 15 VREF 30 kΩ 1 kΩ 3.1 • Input amplifiers that require no capacitor in the input noise filter. 100 Ω Inverter amplifier A13769 13 PRE GND Bias circuit power supply line 20 kΩ VREF 2 kΩ • Amplifier turn-on time control circuit 16 ON TIME MUTE 2.6 • Impulse noise prevention circuit • With a 22 µF capacitor, the turn-on time will be 0.6 s. 16 200 Ω 10 kΩ 2 kΩ 40 kΩ 13 kΩ A13770 Input amplifier ST-BY power supply line 3 kΩ 1 kΩ 22 MUTE 4.1 • The muting function is activated when the applied voltage is under 1 V. VREF Amplifier bias circuit 7.5 kΩ 10 kΩ 100 Ω 22 VREF 100 kΩ A13771 25 CLIPDET No. 7043-5/9 LA4742 Notes on Usage and Handling • Oscillator stabilization In some cases, details of the printed circuit board layout may lead to induced parasitic oscillation. This oscillation can be prevented by adding any one of the following components. Verify the optimal values for these capacitors by testing in actual end products. Technique 1 ... Connect Mylar capacitors (0.1 µF) between the BTL amplifier outputs. Technique 2 ... Connect an RC circuit (2.2 Ω and 0.1 µF in series) between each output and ground. • Audio quality (low band) The low-band frequency characteristics can be improved by adjusting the values of the input capacitors. The recommended value is 2.2 µF. • Impulse noise The LA4742 includes a built-in impulse noise suppression circuit. However, further improvement can be achieved by using the muting circuit. When first applying power, activate the muting function at the same time as applying power. Then, after the output DC potential has stabilized, turn off the muting function. When turning off the power, first activate the muting function and then turn off the power. Sample transient responses are attached (see the timing charts). Transient Responses at Power On Power on: Standby and muting activated at the same time. Muting is turned off after the output has stabilized. 5 [V] External 10 kΩ muting switch MUTE 0 MUTE OFF Standby set high 5 [V] Standby pin 0 [V] 4 Output pin 2 22 0 Mute 10 kΩ + 3.3 µF ON TIME 200 ms/div Transient Responses at Power Off Power off: After activating the muting circuit, turn the power off. 5 [V] 0 External 10 kΩ muting switch MUTE 5 [V] Standby set low 0 [V] Standby pin 4 2 Output pin Mute 10 kΩ + 0 22 3.3 µF 200 ms/div No. 7043-6/9 LA4742 ICCO, VN — VCC RL=Open Rg=0Ω Vst=5 V O I CC 3 150 300 5 Quiescent current, ICCO — V Output power, PO — W 4 Output pin voltage, VN — V 250 100 7 5 3 2 10 7 5 3 2 PO — VIN VCC=14.4V RL=4Ω f=1kHz Rg=600Ω VG=26dB All channels driven 200 VN 2 100 1.0 7 5 3 2 0.1 7 5 3 2 2 3 5 7 100 2 3 5 7 1k 2 3 5 7 10k I CCO 1 50 VN 0 25 0 0 5 10 15 20 0.01 10 Supply voltage, VCC — V 48 44 40 Input level, VIN — mVrms 100 7 5 3 2 10 7 5 3 2 1 7 5 3 2 0.1 7 5 3 2 2 3 57 1 PO — VCC Total harmonic distortion, THD — % RL=4Ω f=1kHz Rg=600Ω THD=10% All channels driven THD — PO VCC=14.4V RL=4Ω f=100Hz Rg=600Ω All channels driven Output power, PO — W 36 32 28 24 20 16 12 8 4 8 OUT2, 4 OUT1, 3 2 3 5 7 10 2 3 5 7 100 10 12 14 16 18 20 0.01 0.1 Supply voltage, VCC — V 100 7 5 3 2 10 7 5 3 2 1 7 5 3 2 0.1 7 5 3 2 0.01 0.1 2 3 5 7 1 2 3 5 7 10 2 3 5 7 100 Output power, PO — W 100 7 5 3 2 10 7 5 3 2 1 7 5 3 2 0.1 7 5 3 2 0.01 0.1 2 3 5 7 1 2 3 5 7 10 2 3 5 7 100 THD — PO Total harmonic distortion, THD — % VCC=14.4V RL=4Ω f=1kHz Rg=600Ω All channels driven THD — PO VCC=14.4V RL=4Ω f=10kHz Rg=600Ω All channels driven Total harmonic distortion, THD — % Output power, PO — W Output power, PO — W THD — f Total harmonic distortion, THD — % 10 7 5 3 2 1 7 5 3 2 0.1 7 5 3 2 0.01 10 f — Response 4 2 Response — dB VCC=14.4V RL=4Ω Rg=600Ω PO=2W All channels driven 0 2.2 µF –2 –4 OU OU 23 T2, 4 0.2 2µ F –6 –8 –10 10 VCC=14.4V RL=4Ω Rg=600Ω VO=0 dBm at f = 1 kHz ALL channels driven 23 5 7 100 23 5 7 1k 23 5 7 10k 23 5 7100k T1 ,3 5 7 100 23 5 7 1k 23 5 7 10k 23 5 7100k Input frequency, f — Hz Input frequency, f — Hz No. 7043-7/9 LA4742 CH Sep — f 0 CH Sep — f Channel separation, CH Sep — dB VCC=14.4V RL=4Ω Rg=10kΩ VO=0dBm 0 Channel separation, CH Sep — dB –20 –20 VCC=14.4V RL=4Ω Rg=10kΩ VO=0dBm –40 –40 1→3 –60 1→2 2→4 –60 2→1 1→4 2→3 –80 –80 –100 10 23 5 7 100 23 5 7 1k 23 5 7 10k 23 5 7100k –100 10 23 5 7 100 23 5 7 1k 23 5 7 10k 23 5 7100k Input frequency, f — Hz Input frequency, f — Hz CH Sep — f 0 CH Sep — f Channel separation, CH Sep — dB VCC=14.4V RL=4Ω Rg=10kΩ VO=0dBm 0 Channel separation, CH Sep — dB –20 –20 VCC=14.4V RL=4Ω Rg=10kΩ VO=0dBm –40 –40 3→1 –60 3→4 3→2 –60 4→1 4→ 2 4→3 –80 –80 –100 10 23 5 7 100 23 5 7 1k 23 5 7 10k 23 5 7100k –100 10 23 5 7 100 23 5 7 1k 23 5 7 10k 23 5 7100k Input frequency, f — Hz 1 Input frequency, f — Hz VNO — Rg Ripple rejection ratio, SVRR — dB VCC=14.4V RL=4Ω DIN AUDIO 0 SVRR — fr VCC=14.4V RL=4Ω Rg=0Ω VCCR=0dBm Output noise voltage, VNO — mVrms 7 5 3 2 –20 –40 0.1 7 5 3 2 –60 –80 0.01 10 23 5 7 100 23 Input resistor, Rg — Ω 5 7 1k 23 5 7 10k 23 5 7100k –100 10 23 5 7100 23 5 7 1k 23 5 710k 23 5 7100k Ripple frequency, fr — Hz 100 300 100 7 5 Pd, ICC — PO VCC=14.4V RL=4Ω Rg=600Ω f=1kHz All channels driven Pd ICCO — Ta VCC=14.4V RL=OPEN Rg=0Ω Quiescent current, ICCO — mA Power dissipation, Pd — W 250 3 2 [W ] 10 Current drain, ICC — A 200 10 7 5 3 2 I CC [A] 150 1 100 50 1 0.01 2 3 5 7 0.1 23 Output power, PO — °C 57 1 23 5 7 10 23 0.1 5 7 100 0 –60 –40 –20 0 20 40 60 80 100 Ambient temperature, Ta — °C No. 7043-8/9 LA4742 THD — Ta Total harmonic distortion, THD — % 10 7 5 3 2 1 7 5 3 2 0.1 7 5 3 2 0.01 –60 –40 –20 0 20 40 60 80 100 VCC=14.4V RL=4Ω Rg=600Ω f=1kHz PO=2W All channels driven Ambient temperature, Ta — °C 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 September, 2001. Specifications and information herein are subject to change without notice. PS No. 7043-9/9