1287

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
±5
−
±22
V
−
60
−
mA
Supply Voltage
VS
Quiescent Drain Current
Id
Input Bias Current
Ib
−
0.15
−
µA
Input Offset Voltage
Vos
−
5
−
mV
Input Offset Current
Ios
−
0.05
−
µA
Output Offset Voltage
Vos
−
10
100
mV
Output Power
PO
VS = ±17V
15.0
18.5
−
W
VS = ±18V
−
20.0
−
W
Vs = ±22V
THD = 1%,
GV = 30dB,
30dB
f = 40Hz to 15kHz,
TC ≤ +70°C
RL = 4Ω
RL = 8Ω
−
16.5
−
W
THD = 10%,
GV = 30dB,
30dB f = 1kHz
TC ≤ +70°C
RL = 4Ω, VS = ±17V
−
24
−
W
RL = 8Ω, VS = ±18V
−
20
−
W
Electrical Characteristics (Cont’d): (VS = ±17V, TA = +25°C unless otherwise specified)
Parameter
Input Sensitivity
Symbol
VI
Frequency Response (−3dB)
Total Harminic Distortion
RL = 4Ω, C4 = 68pF
THD
PO = 150mW to 15W,
RL = 4Ω,
4Ω GV = 30dB,
30dB
TC ≤ +70°C
RI
Voltage Gain
GV
Input Noise Voltage
eN
Input Noise Current
IN
Drain Current
GV = 30dB, f = 1kHz,
PO = 15W
b
Input Resistance (Pin7)
Supply Voltage Rejection
Test Conditions
SVR
Id
Min
Typ
Max
Unit
RL = 4Ω, VS = ±17V
−
260
−
mV
RL = 8Ω, VS = ±18V
−
380
−
mV
10 to 160k
Hz
f = 1kHz
−
0.2
−
%
f = 40Hz to 15kHz
−
0.3
1.0
%
f = 1kHz
PO = 150mW to 15W,
RL = 8Ω,
8Ω GV = 30dB,
30dB
VS = ±18V, TC ≤ +70°C f = 40Hz to 15kHz
−
0.1
−
%
−
0.25
−
%
−
5
−
MΩ
Open Loop
−
100
−
dB
Closed Loop
29.5
30.0
30.5
dB
−
4
−
µV
−
0.1
−
nA
RL = 4Ω, GV = 30dB, fripple = 100Hz
−
50
−
dB
PO = 18.5W, RL = 4Ω,
−
1
−
A
PO = 16.5W, VS = ±18V, RL = 8Ω,
−
0.7
−
A
RL = 4Ω, f = 1kHz
RL = 4Ω, b (−3dB) = 10Hz to 20kHz
Pin Connection Diagram
(+) VCC 1
N.C.
2
(−) VCC 3
N.C.
4
(−) VCC 5
14 Output
13 N.C.
12 Power Limiting
11 N.C.
10 Compensation
N.C.
6
9
Compensation
Non−Inverting Input
7
8
Inverting Input
14
8
1
7
.260
(6.6)
Max
.770 (19.5) Max
.300 (7.62)
.200 (5.08)
Max
.100 (2.54)
Max
.100 (2.54)
.025
(0.64)
.600 (15.24)
.200
(5.08)
.400 (10.16)
Similar pages