1294

NTE1294
Integrated Circuit
Audio Power Amplifier, 1.2W
Description:
The NTE1294 is a monolithic integrated audio amplifier in an 8–Lead DIP type package designed for
use as a low frequency class B power amplifier with a wide supply voltage range (3V to 16V) in portable radios, cassette recorders, and players etc.
Features:
D Minimum Working Supplu Voltage: Vs = 3V Min
D Low Quiescent Current
D Low Number of External Components
D Good Ripple Rejection
D No Cross–over Distortion
D Low Power Dissipation
D Output Power:
Po = 2W at 12V/8Ω
Po = 1.6W at 9V/4Ω
Po = 1.2W at 9V/8Ω
Absolute Maximum Ratings:
Supply Voltage, Vs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16V
Output Peak Current, Io . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.5A
Power Dissipation (TA = +50°C), Ptot . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1W
Junction Temperature Range, TJ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –40° to +150°C
Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –40° to +150°C
Maximum Thermal Resistance, Junction–to–Ambient, RthJA . . . . . . . . . . . . . . . . . . . . . . . . 100°C/W
Electrical Characteristics: (VS = 9V, TA = +25°C unless otherwise specified)
Parameter
Symbol
Test Conditions
Min
Typ
Max Unit
Supply Voltage
Vs
3
–
16
V
Quiescent Output Voiltage (Pin5)
Vo
4.0
4.5
5.0
V
Quiescent Drain Current
Id
–
4
12
mA
Bias Current (Pin3)
Ib
–
0.1
–
µA
Electrical Characteristics (Cont’d): (VS = 9V, TA = +25°C unless otherwise specified)
Parameter
Output Power
Input Sensitivity
Symbol
Po
Vi(rms)
Test Conditions
Min
Typ
Vs = 12V, RL = 8Ω
–
2
–
W
Vs = 9V, RL = 4Ω
–
1.6
–
W
Vs = 9V, RL = 8Ω
0.9
1.2
–
W
Vs = 6V, RL = 4Ω
–
0.75
–
W
Vs = 3.5V, RL = 4Ω
–
0.25
–
W
Vs = 3V, RL = 4Ω
–
0.20
–
W
Po = 1.2W,
RL = 8Ω,
Ω
f = 1kHz
Rf = 33Ω
–
16
–
mV
Rf = 120Ω
–
60
–
mV
Po = 50mW,
RL = 8Ω,
Ω
f = 1kHz
Rf = 33Ω
–
3.5
–
mV
Rf = 120Ω
–
12
–
mV
–
5
–
MΩ
d = 10%,
f = 1kHz,
Rf = 120Ω
Input Resistance (Pin3)
Ri
f = 1kHz
Frequency Response (–3dB)
B
CB = 680pF
RL = 8Ω,
C5 = 1000µF,
µ
CB = 220pF
Rf = 120Ω
Distortion
d
Max Unit
25 to 7000
Hz
25 to 20000
Hz
Po = 500mW, Rf = 33Ω
RL = 8Ω,
Ω
Rf = 120Ω
f = 1kHz
–
0.8
–
%
–
0.4
–
%
–
75
–
dB
Rf = 33Ω
–
45
–
dB
Rf = 120Ω
–
34
–
dB
Voltage Gain (Open Loop)
Gv
f = 1kHz, RL = 8Ω
Voltage Gain (Closed Loop)
Gv
RL = 8Ω,
f = 1kHz
Input Noise Voltage
eN
Note 1
–
3
–
µV
Input Noise Current
iN
Note 1
–
0.4
–
nA
R1 = 10kΩ
–
80
–
dB
R1 = 50kΩ
–
70
–
dB
–
42
–
dB
Signal to Noise Ratio
Supply Voltage Rejection
Note 1. B = 22Hz to 22kHz
S+N
N
SVR
Po = 1.2W,
RL = 8Ω,
Gv = 34dB,
Note 1
RL = 8Ω, fripple = 100Hz,
C6 = 47µF, Rf = 120Ω
Pin Connection Diagram
Frequency Compensation
1
8
Ripple Rejection
Gain Setting
2
7
Bootstrap
Input
3
6
VCC
GND
4
5
Output
8
5
.256 (6.52) Max
1
4
.300 (7.62)
.393 (10.0)
Max
.150
(3.81)
.100 (2.54)
.070 (1.77) Min
.300 (7.62)
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