7118

NTE7118
Integrated Circuit
Audio Power Amplifier, 50W
Description:
The NTE7118 integrated circuit is a hi–fi power amplifier in a 9–Lead SIP type package designed for
use as a building block in radio, TV, and other audio applications. The high performance of the IC
meets the requirements of digital sources (e.g. Compact Disc equipment).
The NTE7118 is totally protected, the two output transistors both having tthermal and SOAR protection. This device also has a mute function that can be arranged for a period after power–on with a
delay time fixed by external components.
The NTE7118 device is intended for symmetrical power supplies but an asymmetrical supply may
also be used.
Features:
D High Output Power (Also with Bootstrap)
D Low Offset Voltage
D Good Ripple Rejection
D Mute/Stand–by Facilities
D Thermal Protection
D Protected Against Electrostatic Discharge
D No Switch–On or Switch–Off Clicks
D Very Low Thermal Resistance
D Safe Operating Area (SOAR) Protection
D Short–Circuit Protection
Absolute Maximum Ratings:
Supply Voltage (Pin6 to Pin4), VP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±30V
Bootstrap Voltage (Pin7 to Pin4), Vbstr . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70V
Output Current (Repetitive Peak), IO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8A
Mute Voltage (Pin3 to Pin4), Vm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7V
Thermal Shut–Down Protection Time (Note 1), tpr . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Hour
Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –65° to +150°C
Thermal Resistance, Junction–to–Mounting Base, Rth j–mb . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1K/W
Note 1. Symmetrical power supply: AC and DC short–circuit protected.
Asymmetrical power supply: AC short–circuit protected.
Driven by a pink–noise voltage.
Electrical Characteristics: (VP = ±27.5V, RL = 8Ω, f = 1kHz, TA = +25°C unless otherwise specified)
Parameter
Supply Voltage Range (Pin6 to Pin4)
Maximum Output Current (Peak Value)
Symbol
Test Conditions
Min
Typ
Max
Unit
VP
±9
–
±30
V
IOMmax
6.4
–
–
A
V3–4
6
–
7
V
Operating State
Input Voltage (Pin3 to Pin4)
Total Quiescent Current
Itot
RL = ∞
30
60
90
mA
Output Power
PO
THD = –60dB
37
40
–
W
THD = –20dB
–
51
–
W
VP = ±23V, THD = –60dB, RL = 8Ω
–
28
–
W
VP = ±23V, THD = –60dB, RL = 4Ω
–
50
–
W
PO = 32W
–
–90
–80
dB
PO = 32W, Note 2
–
–80
–
dB
Total Harmonic Distortion
THD
Intermodulation Distortion
dim
Power Bandwidth
Slew Rate
B
(–3dB) THD = –60dB
dV/dt
Hz
–
10
–
V/µs
–
30
–
dB
–
85
–
dB
Closed Loop Voltage Gain
Gc
Open Loop Voltage Gain
Go
Input Impedance
|Zi|
Note 4
1
–
–
MΩ
Signal–to–Noise Ratio
S/N
PO = 50mW, Note 5
80
–
–
dB
Output Offset Voltage
VO
–
2
*
V
Input Bias Current
II
–
0.1
*
µA
Output Impedance
|Zo|
–
–
0.1
W
Ripple Frequency = 100Hz,
Ripply Voltage = 500mVeff,
(RMS Value)
Source Resistance = 2kΩ
*
–
–
dB
Note 6
–
–
*
µA
V3–4
2
–
4.5
V
Offset Voltage
VO
–
*
–
V
Output Voltage
VO
–
100
–
µV
Ripple Rejection
RR
–
70
–
dB
V3–4
0
–
1
V
Total Quiescent Current
Itot
–
20
–
mA
Ripple Rejection
RR
–
70
–
dB
Supply Voltage to Obtain Steady State
±VP
4.5
–
7.0
V
Supply Voltage Ripple Rejection
Quiescent Current into Pin2
SVRR
I2
Note 3
20 to 25,000
Mute State
Voltage on Pin3
Vi(rms) = 2V, f = 1kHz
Standby State
Voltage on Pin3
* Value to be fixed.
Note 2. Measured with two superimposed signals of 50Hz and 7kHz with an amplitude relationship
of 4:1.
Note 3. The closed loop gain is determined by external resistors and is variable between 20dB and
46dB.
Note 4. The input impedance is determined by the bias resistor.
Note 5. The noise output voltage is measured in a bandwidth of 20Hz to 20kHz with a source resistance of 2kΩ.
Note 6. The quiescent current into Pin2 has an impact on the mute time.
Pin Connection Diagram
(Front View)
1 Input
2 Protection
3 Mute
4
–VCC
5 Output
6 +VCC
7 Bootstrap
8 GND
9 Feedback
.961 (24.4)
.780 (19.8)
.185 (4.7)
.489
(12.4)
9
1
.079
(2.0)
.674
(17.0)
.079 (2.0)
.100 (2.54)
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