7220

NTE7220
Integrated Circuit
Audio Power Amp, 70W/Ch
Description:
The NTE7220 is a class H audio power amplifier hybrid integrated circuit in an 18−Lead SIP type package that features a built−in shift power supply circuit. This device provides high efficiency audio power
amplification by controlling (switching) the supply voltage supplied to the power transistors according
to the detected level of the input audio signal.
Absolute Maximum Ratings: (TA = +25C unless otherwise specified)
Maximum Supply Voltage, VHmax
No Signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69V
Signal Present (RL = 8, 6) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62V
Signal Present (RL = 4) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49V
Maximum Supply Voltage, VLmax
No Signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44V
Signal Present (RL = 8, 6) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40V
Signal Present (RL = 4) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40V
Maximum Supply Voltage (No Load, Note 1), VH−Lmax . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60V
Maximum Junction Temperature, TJ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +150C
Operating Substrate Temperature, TC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +125C
Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −30 to +125C
Thermal Resistance, Junction−to−Case (Per Power Transistor), RthJC . . . . . . . . . . . . . . . . . 1.9C/W
Allowable Load Shorted Time, ts
(VH = 43V, VL = 30V, RL = 8, f = 50Hz, PO = 70W, One Channel Operating) . . . . . . 0.3s
Note 1. Design circuits so that (|VH| − |VL|) is always less than 40V when switching the power supply
with the load connected.
Operating Characteristics: (TA = +25C, RL = 8 (non−inductive load), Rg = 600, VG = 40dB,
VZ = 15V, Note 2 unless otherwise specified)
Parameter
Output Power
Symbol
Test Conditions
Min
Typ Max
Unit
PO
VH = 43V, VL = 30V, f = 20Hz to 20kHz, THD = 0.8%
70
−
−
W
VH = 34V, VL = 25V, f = 1kHz, THD = 0.8%, RL = 4
−
70
−
W
−
0.4
−
%
Total Harmonic Distortion
THD
VH = 43V, VL = 30V, f = 20Hz to 20kHz, PO = 70W
Frequency Characteristics
fL, fH
VH = 43V, VL = 30V, PO = 1W, +0, −3dB
ri
VH = 43V, VL = 30V, f = 1kHz, PO = 1W
−
55
−
k
Output Noise Voltage
VNO
VH = 52V, VL = 34V, Rg = 2.2k, Note 3
−
−
1.0
mVrms
Quiescent Current
ICCO
VH = 52V, No Load
−
−
30
mA
VL = 34V, No Load
−
−
100
mA
−70
−
+70
mV
Input Impedance
Midpoint Voltage
VN
VH = 52V, VL = 34V
20 to 50k
Hz
Note 2. Unless otherwise specified, a constant−voltage power supply must be used during inspection.
Note 3. The output noise voltage rating gives the peak value read by an averaging VTVM. However,
to eliminate the influence of flicker noise from the AC primary side line, use an AC stabilized
power supply (50Hz).
Pin Connection Diagram
(Front View)
18 Ch2 Input
17
16 GND
15
14 Ch1 Input
13 +VH
12 −VH
11 Ch2 Output
10
9 Ch1 Output
8
7 Substrate GND
6 −VH
5 −VL
4
3
2 +VL
1 +VH
2.520 (64.0)
.334 (8.5)
2.190 (55.6)
1.440
(36.4)
1
18
.141
(3.6)
Dia
(2 Holes)
.737
(18.7)
1.030
(32.5)
.158 (4.0)
.100 (2.54)
1.700 (43.18)
.114 (5.5)