UNISONIC TECHNOLOGIES CO., LTD LM1875 LINEAR INTEGRATED CIRCUIT 20W AUDIO POWER AMPLIFIER DESCRIPTION 1 The UTC LM1875 is a monolithic power amplifier offering very low distortion and high quality performance for consumer audio applications. It delivers 20W into a 4Ω or 8Ω load on ±25V supplies. Using an 8Ω load and +30V supplies, over 30W of power may be delivered. The amplifier is designed to operate with a minimum of external components. Device overload protection consists of both internal current limit and thermal shutdown. The UTC LM1875 design utilizes advanced circuit techniques and processing to achieve extremely low distortion levels even at high output power levels. Other outstanding features include high gain, fast slew rate and a wide power bandwidth, large output voltage swing, high current capability, and a very wide supply range. The amplifier is internally compensated and stable for gains of 10 or greater. TO-220-5 1 TO-220B *Pb-free plating product number: LM1875L FEATURES *Up to 30W output power *Avo typically 90 dB *Low distortion: 0.015%,1kHz,20W *Wide power bandwidth: 70kHz *Protection for AC and DC short circuits to ground *Thermal protection with parole circuit *High current capability: 4A *Wide supply range 16V-60V *Internal output protection diodes *94 dB ripple rejection APPLICATIONS *High performance audio systems *Bridge amplifiers *Stereo phonographs *Servo amplifiers *Instrument systems ORDERING INFORMATION Order Number Normal Lead Free Plating LM1875-TA5-T LM1875L-TA5-T LM1875-TB5-T LM1875L-TB5-T Package TO-220-5 TO-220B Pin Assignment 1 2 3 4 5 +IN -IN -VEE OUT VCC +IN -IN -VEE OUT VCC Packing Tube Tube L M 1 8 7 5 L -T A5 -T (1)Packing Type (1) T: Tube (2)Package Type (2) TA5: TO-220-5, TB5: TO-220B (3)Lead Plating (3) L: Lead Free Plating, Blank: Pb/Sn www.unisonic.com.tw Copyright © 2005 Unisonic Technologies Co., Ltd 1 of 7 QW-R107-019,D LM1875 LINEAR INTEGRATED CIRCUIT ABSOLUTE MAXIMUM RATINGS (Ta=25℃) PARAMETER SYMBOL RATING UNIT Supply Voltage VCC 60 V Input Voltage VIN -VEE ~ VCC V Junction Temperature TJ +150 ℃ Storage Temperature TSTG -40 ~ +150 ℃ Note Absolute maximum ratings are those values beyond which the device could be permanently damaged. Absolute maximum ratings are stress ratings only and functional device operation is not implied. ELECTRICAL CHARACTERISTICS (VCC=+25V,-VEE=-25V,Ta=25℃,RL=8Ω,Av=20(26dB),fo=1kHz,unless otherwise specified.) PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT Supply Current ICC POUT=0W 70 100 mA Output Power(Note) POUT THD=1% 25 W POUT=20W,fo=1kHz 0.015 Total Harmonic Distortion POUT =20W, fo =20kHz 0.05 0.4 THD % (Note) POUT =20W,RL=4Ω,fo=1kHz 0.022 POUT =20W,RL=4Ω,fo=20kHz 0.07 0.6 Offset Voltage VO(OFF) ±1 ±15 mV Input Bias Current II(BIAS) ±0.2 ±2 µA Input Offset Current II(OFF) 0 ±0.5 µA Gain-Bandwidth Product GBW Fo=20kHz 5.5 MHz Open Loop Gain Gv DC 90 dB VCC,1kHz,1 Vrms 52 95 Power Supply Rejection Ratio RR dB VEE,1kHz,1 Vrms 52 83 Max Slew Rate SR 20W,8Ω,70kHz BW 8 V/µs Current Limit ILIMIT VOUT=VSUPPLY–10V 3 4 A Equivalent Input Noise Voltage eN Rs=600Ω,CCIR 3 µVrms Note: Assumes the use of a heat sink having a thermal resistance of 1℃/W and no insulator with an Ta=25℃. Because the output limiting circuitry has a negative temperature coefficient, the maximum output power delivered to a 4Ω load may be slightly reduced when the tab temperature exceeds 55℃. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 2 of 7 QW-R107-019,D LM1875 LINEAR INTEGRATED CIRCUIT TYPICAL APPLICATION CIRCUIT +Vcc + C3 0.1μF 4Ω~8Ω C1 2.2μF 1 VIN R1 1M C7 100μF 5 + R2 22k 4 LM1875 2 _ R5 1 3 -VEE C4 0.1μF R4 20k C5 0.22μF C6 + 100μF R3 1K + C2 22μF TYPICAL SINGLE SUPPLY OPERATION R2 +Vcc C4 0.1μF 22k R1 22k + C2 10μF C1 1.0μF VIN R4 1M 1 + 5 LM1875 2 _ C3 R5 10μF 10k + UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw C7 + 100μF R3 22k 4 R7 1 C5 0.22μF 3 C6 2200μF + 4Ω~ 8Ω R6 200k 3 of 7 QW-R107-019,D LM1875 LINEAR INTEGRATED CIRCUIT TYPICAL CHARACTERISTICS THD vs Power Output THD vs Supply Voltage 0.1 Vs=+25V 0.09 PD=10W 0.08 0.07 THD(%) Total Harmonic Distortion (%) 1.0 0.1 0.06 0.05 0.04 RL =4Ω 0.03 RL =8Ω 0.02 0.01 0.1 1.0 10 0.01 0 20 100 50 100 200 500 1K 2K Power Output (W) Supply Current vs Supply Voltage 100 RL =8Ω THD=1% 30 80 Supply Current (mA) Power Output (W) Frequency (Hz) Power Output vs Supply Voltage 35 25 20 15 10 60 40 20 5 0 0 0 5 10 15 20 Supply Voltage (+V) 25 30 0 90 40 80 POSITIVE SUPPLY 70 35 NEGATIVE SUPPLY 50 40 20 10 INPUT REFERRED RS =0 RL=4 1 Vrms 5K 10K 20K Frequency (Hz) UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 20 25 30 1℃/W HEAT SINK 25 20 5℃/W HEAT SINK 15 2℃/W HEAT SINK 10 0 50 100 200 500 1K 2K 15 INFINITE HEAT SINK 30 5 0 20 Device Dissipation (W) 45 30 10 Device Dissipation vs Ambient Temperature 100 60 5 Supply Voltage (±V) RR vs Frequency RR (dB) 5K 10K 20K 10℃/W HEAT SINK 0 20 40 60 80 100 120 140 160 Ta - Ambient Temperture (℃) Interface=1℃/W See Application Hints . 4 of 7 QW-R107-019,D LM1875 LINEAR INTEGRATED CIRCUIT TYPICAL CHARACTERISTICS (Cont.) Power Disipation vs Power Output 50 Vs=+30V 40 35 30 Vs=+25V 25 20 Vs=+20V 15 10 5 0 Vs=+15V RL=4Ω fo=1kHz 0 5 10 20 15 RL=8Ω fo=1kHz 45 Power Dissipation (W) Power Dissipation (W) 50 45 Power Disipation vs Power Output 25 40 35 30 Vs=+25V 20 15 Vs=+20V 10 5 0 30 Vs=+30V 25 Vs=+15V 0 5 10 15 20 25 30 Power Output (W) Power Output (W) I OUT vs VOUT-Current Limit/ Safe Operating Area Boundary Open Loop Gain and Phase vs Frequency 30 6 0 -2 -4 20 180 15 135 10 90 5 45 0 0 -5 -45 -10 -90 -135 -15 -6 -25 -20 -15 -10 -5 0 5 10 15 20 25 Output Voltage (V) -20 100k Ohase Lag (Degrees) 2 Gain (dB) Output Current (A) 25 4 1M -180 10M Frequency (Hz) Input Bias Current vs Supply Volage Input Bias Current (nA) 300 250 TA =70℃ TA= 25℃ 200 TA=0℃ 150 100 0 0 5 10 15 20 Supply Voltage(+V) 25 30 UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw * Thermal shutdown with infinite heat sink **Thermal shutdown with 1℃/ W heat sink 5 of 7 QW-R107-019,D UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw Vin 2.2μ Cin V- 3 2 Rin 22k 1 Q47 Q48 Q3 4p C3 V+ Q7 5 R4 6.8k Q4 3.3k R2 Q1 R1 R5 6.2k Q9 3.3k R3 Q8 Q5 1.2k R7 15k R6 50k 4p C1 Q6 Q29 R18 2.7k Q2 Q10 Q11 395 R14 4.9k R9 Z1 1k R13 Q19 C2 4p Q14 1 3 Q12 R12 450 820 R11 R10 3.6k R8 1.7k Q20 R15 3.3k Q17 Q13 910 R17 Q40 Q15 R15 6k2 Q18 Q31 Z3 Z2 R23 20k Q32 80k R24 450 R27 R25 1.2k Q30 R21 30 R26 40k Q21 R19 5k Q41 Q22 R20 370 R28 150 S Q33 3x 3x Q42 S Q25 3k R29 10X Q28 R33 26 Q24 R22 30 1 R30 200 1 2 S Q36 S Q37 3x 3x 3x Q26 Q46 10X S Q27 11 S Q44 R31 75 R40 40 75 R34 Q38 40X R37 400 S Q34 40X R39 510 Z7 Z6 R41 20k R36 510 Z5 Q45 3X S 3X R35B 20 R35A 20 R32B 20 20 R32A 3X 3X Q43 Z4 R38 20k S R35 0.25 Q39 500X 4 R32 0.25 500X S Q35 C1 22μ 1k R11 R12 20k Load Rc 1 220n Cc Vout LM1875 LINEAR INTEGRATED CIRCUIT QW-R107-019,D 6 of 7 LM1875 LINEAR INTEGRATED CIRCUIT UTC 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 UTC products described or contained herein. UTC products are not designed for use in life support appliances, devices or systems where malfunction of these products can be reasonably expected to result in personal injury. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 7 of 7 QW-R107-019,D