7145

NTE7145
Intergrated Circuit
18W BTL x 2 Ch Audio Power Amplifier
Description:
The NTE7145 is a stereo audio power IC in a 17–Lead Staggered SIP type package designed for car
audio use. This device has 2 built–in channels to reduce the characteristics difference between L and
R channels. In addition, the functions of stand–by, muting, and a variety of protections circuits are
involved.
Features:
D High Power:
POUT(1) = 18W (Typ)/Channel (VCC = 14.4V, f = 1kHz, THD = 10%, RL = 4Ω)
POUT(2) = 15W (Typ)/Channel (VCC = 13.2V, f = 1kHz, THD = 10%, RL = 4Ω)
D Low Distortion Ratio:
THD = 0.04% (Typ) (VCC = 13.2V, f = 1kHz, POUT = 1W, RL = 4Ω, GV = 50dB)
D Low Noise:
VNO = 0.30mVrms (Typ) (VCC = 13.2V, RL = 4Ω, GV = 50dB, Rg = 0Ω, BW = 20Hz to 20kHz)
D Built–In Stand–By Function (With Pin4 set at Low, Power is Turned OFF):
ISB = 1µA (Typ)
D Built–In Muting Function (With Pin1 set at Low, Power is Turned OFF):
V (Mute) = 1V (Typ)
D Built–In Various Protection Circuits:
Thermal Shut Down
Overvoltage
OUT→VCC Short
OUT→GND Short
OUT–OUT Short
D Operating Supply Voltage: VCC = 9V to 18V
Absolute Maximum Ratings: (TA = +25°C unless otherwise specified)
Peak Supply Voltage (0.2s), VCCsurge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50V
DC Supply Voltage, VCCDC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25V
OPerating Supply Voltage, VCCopr . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18V
Output Current (Peak), IO(peak) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9A
Power Dissipation, PD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50W
Operating Temperature Range, Topr . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –30° to +85°C
Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –55° to +150°C
Electrical Characteristics: (TA = +25°C, VCC = 13.2V, RL = 4Ω, f = 1kHz, unless otherwise specified)
Parameter
Symbol
Test Conditions
Min
Typ
Max
Unit
Quiescent Supply Current
ICCQ
VIN = 0
–
120
250
mA
Output Power
POUT
VCC = 14.4V, THD = 10%
–
18
–
W
THD = 10%
11
15
–
W
POUT = 1W
–
0.04
0.4
%
48
50
52
dB
Total Harmonic Distortion
THD
Voltage Gain
GV
Output Noise Voltage
VNO
Rg = 0Ω, BW = 20Hz to 20kHz
–
0.3
0.7
mVrms
Ripple Rejection Ratio
RR
fripple = 100Hz, Rg = 600Ω
40
54
–
dB
Input Resistance
RIN
–
30
–
kΩ
–0.3
0
+0.3
V
–
1
10
µA
–
60
–
dB
2.5
–
VCC
V
–
1.0
2.0
V
Output Offset Voltage
Voffset
Current at Stand–By State
ISB
Crosstalk
CT
Pin4 Control Voltage
V(SB)
Pin1 Control Voltage
V(MUTE)
VIN = 0
Rg = 600Ω, VOUT = 0.775Vrms (0dBm)
Stand–By→OFF (Power→ON)
Mute→ON (Power→OFF)
Pin Connection Diagram
(Front View)
17
16
15
14
13
12
11
Power VCC2
Output 2
Output 1
GND 1
GND 2
Output 4
Output 3
10 Power VCC1
9 Pre–VCC
8 Ripple
7 Input 2
6 NF 2
5 Pre–GND
4 Stand–By Switch
3 NF 1
2 Input 1
1 Mute Switch
1.440 (36.6)
.197 (5.0)
1.180 (30.0)
.670
(17.0)
.154
(3.9)
.550
(14.0)
1
17
.394
(10.0)
.197
(5.0)
.079 (2.0)
.079 (2.0)
.101 (2.56)
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