UNISONIC TECHNOLOGIES CO LM1875 Technical data
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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 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.
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
LINEAR INTEGRATED CIRCUIT
1
TO-22 0-5
1
TO-220B
*Pb-free plating product number: LM1875L
APPLICATIONS
*High performance audio systems
*Bridge amplifiers
*Stereo phonographs
*Servo amplifiers
*Instrument systems
ORDERING INFORMATION
Order Number Pin Assignment
Normal Lead Free Plating
LM1875-TA5-T LM1875L-TA5-T TO-220-5 +IN -IN -VEEOUT VCC Tube
LM1875-TB5-T LM1875L-TB5-T TO-220B +IN -IN -VEEOUT VCC Tube
Package
1 2 3 4 5
Packing
LM1875L-TA5-T
(1)Packing Type
(2)Package Type
(3)Lead Plating
(1) T: Tube
(2) TA5: TO -2 20-5, TB5: TO-220B
(3) L: Lead Free Plating, Blank: Pb/Sn
www.unisonic.com.tw 1 of 7
Copyright © 2005 Unisonic Technologies Co., Ltd
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 T
-40 ~ +150
STG
℃
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 P
Output Power(Note) P
Total Harmonic Distortion
(Note)
Offset Voltage V
Input Bias Current I
Input Offset Current I
THD=1% 25 W
OUT
THD
O(OFF)
±0.2 ±2 µA
I(BIAS)
0 ±0.5 µA
I(OFF)
=0W 70 100 mA
OUT
P
=20W,fo=1kHz 0.015
OUT
P
=20W, fo =20kHz 0.05 0.4
OUT
P
=20W,RL=4Ω,fo=1kHz 0.022
OUT
P
=20W,RL=4Ω,fo=20kHz 0.07 0.6
OUT
%
±1 ±15 mV
Gain-Bandwidth Product GBW Fo=20kHz 5.5 MHz
Open Loop Gain Gv DC 90 dB
Power Supply Rejection Ratio RR
V
CC
V
,1kHz,1 Vrms
EE
52
52
95
83
dB
,1kHz,1 Vrms
Max Slew Rate SR 20W,8Ω,70kHz BW 8 V/µs
Current Limit I
LIMIT
V
OUT=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
TYPICAL APPLICATION CIRCUIT
+Vcc
C3 C7
0.1μF
C1
2.2μF
V
IN
R1
1M
TYPICAL SINGLE SUPPLY OPERATION
IN
V
R2
22k
R1
22k
C1
1.0μF
R4
1M
+
1
+
2
_
EE
-V
0.1μF
R3 1K
C2
22μF
+
C2
10μF
LM1875
C4
5
3
R3
22k
R4
20k
1
2
22k
R2
+
LM1875
_
LINEAR INTEGRATED CIRCUIT
+
4
+
+Vcc
C6
100μF
C4
0.1μF
C7
+
5
R7
3
0.22μF
100μF
100μF
4
1
C5
4Ω~8Ω
R5
1
C5
0.22μF
C6
2200μF
+
4Ω~ 8Ω
C3
10μF
R5
10k
+
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
R6
200k
3 of 7
QW-R107-019,D
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