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UNISONIC TECHNOLOGIES CO., LTD LM1875
20W AUDIO POWER AMPLIFIER
DESCRIPTION
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 4 or 8 load on 25V supplies. Using an 8 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.
1
LINEAR INTEGRATED CIRCUIT
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
L M 1 8 7 5 L -T A5 -T (1)Packing Type (2)Package Type (3)Lead Plating (1) T: Tube (2) TA5: TO-220-5, TB5: TO-220B (3) L: Lead Free Plating Blank: Pb/Sn ,
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
www.unisonic.com.tw Copyright (c) 2005 Unisonic Technologies Co., Ltd
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LM1875
ABSOLUTE MAXIMUM RATINGS (Ta=25 )
LINEAR INTEGRATED CIRCUIT
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=8 ,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=4,fo=1kHz 0.022 POUT =20W,RL=4,fo=20kHz 0.07 0.6 Offset Voltage VO(OFF) 1 15 mV Input Bias Current II(BIAS) 0.2 2 A Input Offset Current II(OFF) 0 0.5 A 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,8,70kHz BW 8 V/s Current Limit ILIMIT VOUT=VSUPPLY-10V 3 4 A Equivalent Input Noise Voltage eN Rs=600,CCIR 3 Vrms 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 4 load may be slightly reduced when the tab temperature exceeds 55 .
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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LM1875
TYPICAL APPLICATION CIRCUIT
+Vcc C3 0.1 F C1 2.2 F VIN R1 1M R2 22k 2_ -VEE C4 0.1 F 1 +
LINEAR INTEGRATED CIRCUIT
C7 100
F 4 ~8
+
5 LM1875 3 C6 + 100 F 4 R5 1 C5 0.22 F
R4 20k
R3 1K + C2 22 F
TYPICAL SINGLE SUPPLY OPERATION
R1 22k + C2 10 F
R2 +Vcc C4 0.1 F 22k
C1 1.0 F VIN R4 1M
R3 22k 1 + 5
C7 + 100
F C6 2200 +
LM1875 2_ 3
4
F
R7 1 C5 0.22 F R6 200k
4
~
C3 R5 10 F 10k +
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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LM1875
TYPICAL CHARACTERISTICS
THD vs Power Output 1.0 Total Harmonic Distortion (%) 0.1
LINEAR INTEGRATED CIRCUIT
THD vs Supply Voltage Vs=+25V 0.09 PD=10W 0.08 0.07 THD(%) 0.06 0.05 0.04 0.03 0.02 0.01 0 20 RL=4 RL=8
0.1
0.01 0.1
1.0
10
100
50 100 200 500 1K 2K Frequency (Hz)
5K 10K 20K
Power Output (W)
35 30 Power Output (W) 25 20 15 10 5 0 0
Power Output vs Supply Voltage RL=8 THD=1% Supply Current (mA) 100 80 60 40 20 0 5 10 15 20 Supply Voltage (+V) 25 30
Supply Current vs Supply Voltage
0
5
10
15
20
25
30
Supply Voltage ( V)
RR vs Frequency 100 90 Device Dissipation (W) 80 POSITIVE SUPPLY 70 RR (dB) 60 50 40 30 20 10 0 20 50 100 200 500 1K 2K Frequency (Hz) 5K 10K 20K INPUT REFERRED RS=0 RL=4 1 Vrms NEGATIVE SUPPLY
Device Dissipation vs Ambient Temperature 45 40 35 30 25 20 15 10 5 0 10 /W HEAT SINK 0 20 40 60 80 100 120 140 160 Ta - Ambient Temperture ( ) Interface=1 /W See Application Hints .
5 /W HEAT SINK
INFINITE HEAT SINK
1 /W HEAT SINK 2 /W HEAT SINK
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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TYPICAL CHARACTERISTICS (Cont.)
Power Disipation vs Power Output
50 45 Vs=+30V 50 45 40 35 30 25 20 15 10 5 0
LINEAR INTEGRATED CIRCUIT
Power Disipation vs Power Output
RL=8 fo=1kHz
Power Dissipation (W)
35 30 25 20 15 10 5 0 Vs=+25V
Power Dissipation (W)
40
Vs=+30V Vs=+25V
Vs=+20V Vs=+15V RL=4 fo=1kHz 0 5 10 15 20 25 30
Vs=+20V Vs=+15V 0 5 10 15 20 25 30
Power Output (W)
Power Output (W)
IOUT vs VOUT-Current Limit/ Safe Operating Area Boundary
6
30 25 20 15
Open Loop Gain and Phase vs Frequency
Output Current (A)
4
180 135 90 45 0 -45 -90 -135 1M -180 10M
Gain (dB)
2 0 -2 -4 -6 -25 -20 -15 -10 -5 0 5 10 15 20 25
10 5 0 -5 -10 -15 -20 100k
Output Voltage (V)
Frequency (Hz)
Input Bias Current vs Supply Volage
300 TA=70
Input Bias Current (nA)
250
TA= 25
200 150 100 0
TA=0
0
5
10
Supply Voltage (+V)
15
20
25
30
* Thermal shutdown with infinite heat sink **Thermal shutdown with 1 / W heat sink
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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Ohase Lag (Degrees)
V+
5
R1 Q13 R23 20k Q22 Q24 R33 26 S Q34 40X Z4 S Q44 11 S Q27 Z5 3X R32A R36 510 20 R32 0.25 R37 400 Z2 Z1 R10 3.6k R32B 20 4 Vout R29 3k Q36 S 10X
1
R8 1.7k R21 30 R19 5k R38 20k R20 370 R22 30
LM1875
1.2k
Q12 3
Q1
Q2
1 R18 2.7k Q21 10X R31 75 3X Q43 Q28 Q14
S Q35 500X
UNISONIC TECHNOLOGIES CO., LTD
Q15 Q6 Q41 3x 3x Q26 Q46 Q42 S Q25 3x 2 1 40X Q17 R15 6k2 Z3 R24 80k R34 75 Q32 Q40 Q31 R26 40k Q20 R14 395 1k R13 910 R17 R27 450 R28 150 R40 40 S Q37 3x R39 510 Z7 S S Q33 3x 3X R11 1k R35A 20 R35 0.25 R35B 20 C1 22 Q38 R30 200 R25 1.2k Z6 S Q39 500X R12 20k Load R41 20k Q30 C1 R11 820 4p Q10 R12 450 Q18 C2 4p R9 R6 50k Q11 R7 15k 4.9k Q19 R15 3.3k Q45 3X
www.unisonic.com.tw
Q29
R2
R3
3.3k
3.3k
Q3
Q4
Q5
Cin
2.2
Vin
1
Rin 22k
Q47
2
Q48
Cc 220n
C3
4p
Q9
Rc 1
Q7
Q8
R4 6.8k
R5 6.2k
V- 3
LINEAR INTEGRATED CIRCUIT
QW-R107-019,D
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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
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