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LA4742 Dataheets PDF



Part Number LA4742
Manufacturers Sanyo
Logo Sanyo
Description 45 W Four-Channel Bridge Circuit Power Amplifier
Datasheet LA4742 DatasheetLA4742 Datasheet (PDF)

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.

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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 .


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