Document
NTE1287 Integrated Circuit Linear, Audio Power Amp, 20 Watt Includes Thermal Shutdown
Description:
The NTE1287 is a monolithic integrated operational amplifier in a 14−lead quad in−line plastic package, intended for use as a low frequency class B power amplifier. Typically it provides 20W output power (d = 1%) at ±18V/4Ω; the guaranteed output power at ±17V/4Ω is 15W. The NTE1287 provides high output current (up to 3.5A) and has very low harmonic and cross−over distortion. Further, the device incorporates an original (and patented) short circuit protection system, comprising an arrangement for automatically limiting the dissipated power so as to keep to working point of the output transistors within their safe operating area. A conventional thermal shut−down system is also included.
Absolute Maximum Ratings:
Supply Voltage, VS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±22V
Input Voltage, Vi . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Vs Differential Input Voltage, Vi . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±15V
Output Peak Current (internally limited), IO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.5A Power Dissipation (TC ≤ +75°C), Ptot . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25W Junction Temperature Range, TJ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −40° to +150°C Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −40° to +150°C Thermal Resistance, Junction−to−Case, RthJC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +3°C/W
Typical Thermal Shut−Down Temperature, Tsd Junction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +140°C Case . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +105°C
Electrical Characteristics: (VS = ±17V, TA = +25°C unless otherwise specified)
Parameter
Symbol
Test Conditions
Min Typ Max Unit
Supply Voltage Quiescent Drain Current Input Bias Current Input Offset Voltage Input Offset Current Output Offset Voltage Output Power
VS
±5 − ±22 V
Id Vs = ±22V
− 60 − mA
Ib
− 0.15 − µA
Vos
−
5
− mV
Ios
− 0.05 − µA
Vos
− 10 100 mV
PO THD = 1%, GV = 30dB, f = 40Hz to 15kHz,
TC ≤ +70°C
RL = 4Ω VS = ±17V 15.0 18.5 −
W
VS = ±18V − 20.0 −
W
RL = 8Ω
− 16.5 − W
THD = 10%, GV = 30dB, f = 1kHz TC ≤ +70°C
RL = 4Ω, VS = ±17V RL = 8Ω, VS = ±18V
− 24 − W − 20 − W
Electrical Characteristics (Cont’d): (VS = ±17V, TA = +25°C unless otherwise specified)
Parameter
Symbol
Test Conditions
Min Typ Max Unit
Input Sensitivity Frequency Response (−3dB) Total Harminic Distortion
Input Resistance (Pin7) Voltage Gain
VI b THD
RI GV
GV = 30dB, f = 1kHz, PO = 15W
RL = 4Ω, C4 = 68pF PO = 150mW to 15W, RL = 4Ω, GV = 30dB, TC ≤ +70°C PO = 150mW to 15W, RL = 8Ω, GV = 30dB, VS = ±18V, TC ≤ +70°C
RL = 4Ω, VS = ±17V RL = 8Ω, VS = ±18V
f = 1kHz f = 40Hz to 15kHz f = 1kHz f = 40Hz to 15kHz
RL = 4Ω, f = 1kHz
Open Loop Closed Loop
− 260 − mV
− 380 − mV
10 to 160k
Hz
− 0.2 − %
− 0.3 1.0 %
− 0.1 − %
− 0.25 − %
−
5
− MΩ
− 100 − dB
29.5 30.0 30.5 dB
Input Noise Voltage Input Noise Current Supply Voltage Rejection Drain Current
eN IN SVR Id
RL = 4Ω, b (−3dB) = 10Hz to 20kHz
RL = 4Ω, GV = 30dB, fripple = 100Hz PO = 18.5W, RL = 4Ω, PO = 16.5W, VS = ±18V, RL = 8Ω,
−
4
− µV
− 0.1 − nA
− 50 − dB
−
1
−
A
− 0.7 −
A
Pin Connection Diagram
(+) VCC 1 N.C. 2
(−) VCC 3 N.C. 4
(−) VCC 5 N.C. 6
Non−Inverting Input 7
14 Output 13 N.C. 12 Power Limiting 11 N.C. 10 Compensation 9 Compensation 8 Inverting Input
14
8
.260
(6.6)
Max
1
7
.200 (5.08) Max
.100 (2.54)
.770 (19.5) Max
.300 (7.62)
.100 (2.54) Max
.025 (0.64) .600 (15.24)
.200 (5.08)
.400 (10.16)
.