TDA7245A [STMICROELECTRONICS]
6W AUDIO AMPLIFIER WITH STAND-BY; 与STAND- BY 6W音频放大器
| 型号： | TDA7245A |
| 厂家： | 
ST |
| 描述： | 6W AUDIO AMPLIFIER WITH STAND-BY |
| 文件： | 总6页 (文件大小：61K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
TDA7245A
6W AUDIO AMPLIFIER WITH STAND-BY
STAND-BY FUNCTION
SUPPLY VOLTAGE RANGE UP TO 30V
MUSIC POWER = 16W (R = 4 , d = 10%)
Ω
L
THERMAL PROTECTION
DESCRIPTION
Powerdip 9+9
The TDA7245A is a monolithic integrated circuit
in 9+9 POWERDIP package, intended for use as
low frequency power amplifier in a wide range of
applications in radio and TV sets.
ORDERING NUMBER: TDA7245A
Figure 1:
Test and Application Circuit
May 1997
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TDA7245A
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
30
Unit
V
VS
IO
Supply Voltage
Output Peak Current (non repetitive t = 100 s)
3
A
µ
IO
Output Peak Current (repetitive, f > 20Hz)
2.5
A
Power Dissipation at Tamb = 80°C
1
6
W
W
Ptot
at Tcase = 70 C
°
Tstg, Tj
Storage and junction Temperature
-40 to 150
C
°
PIN CONNECTION
(Top view)
Figure 2: SchematicDiagram
THERMAL DATA
Symbol
Description
Value
Unit
C/W
C/W
°
Rth j-case Thermal Resistance junction-case
Rth j-amb
Max
Max
15
70
°
Thermal Resistance junction-ambient
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TDA7245A
ELECTRICAL CHARACTERISTICS (Refer to the test circuit, Tamb = 25°C, VS = 16.5V, RL = 4Ω, f =
1kHz; unless otherwise specified).
Symbol
Parameter
Supply Voltage
Test Condition
VS = 24V
Min.
Typ.
Max.
Unit
V
VS
VO
Id
12
30
Quiescent Output Voltage
Quiescent Drain Current
Output Power
11.6
24
V
VS = 28V
d = 1%
35
mA
PO
VS = 16.5V, R = 4
VS = 20V, RL = 8Ω
6
5
W
W
Ω
L
d = 10%
VS = 16.5V, R = 4
VS = 20V, R = 8
6.5
7.5
6.5
W
W
Ω
L
Ω
L
Music Power (*)
VS = 24V, d = 10%, R = 4
16
W
Ω
L
d
Harmonic Distortion
PO = 50mW to 4W
f = 1KHz
0.15
0.8
0.5
%
%
f = 10KHz
VS = 20V, R = 8 ,
Ω
L
P
O = 50mW to 3.5W
f = 1KHz
f = 10KHz
0.12
0.5
%
%
RI
BW
GV
GV
eN
Input Impedance
f = 1kHz
30
39
KΩ
Hz
dB
dB
Small signal bandwidth (-3dB)
Voltage Gain (open loop)
Voltage Gain (closed loop)
Total Input Noise
PO = 1W
20 to 40,000
f = 1KHz
75
40
f = 1KHz
41
6
B = 22 - 22,000Hz
R = 50
1.7
2
3
mV
Ω
s
R = 1k
V
Ω
µ
s
Rs = 10kΩ
µV
dB
dB
S/N
Signal to Noise Ratio
PO = 5W; RS = 10K
86
45
Ω
SVR
Supply Voltage Rejection
VS = 16.5V; R = 8 ; f = 100Hz
38
Ω
L
Rs = 10kΩ; Vr = 0.5Vrms
Tsd
Thermal shut-down Junction
Temperature
150
°C
STAND-BY FUNCTION
Symbol
Vst-by
Ist-by
Parameter
Test Condition
SW1 Open (play)
SW1 Closed (st-by)
f = 1kHz
Min.
Typ.
6.4
160
90
Max.
Unit
V
Pin 5 DC Voltage
Pin 5 Current
280
µA
dB
V
ATTst-by
Vt
Stand-by Attenuation
Stand-by Threshold (pin 5)
Quiescent Current @ Stand-by
70
3.8
2
Id st-by
4
mA
Note (*):
MUSIC POWER CONCEPT
MUSIC POWER is ( according to the IEC clauses n.268-3 of Jan 83) the maximal power which the amplifier is capable of producing across the
rated load resistance (regardless of non linearity) 1 sec after the application of a sinusoidal input signal of frequency 1KHz.
According to this definition our method of measurement comprises the following steps:
1) Set the voltage supply at the maximum operating value -20%
2) Apply a input signal in the form of a 1KHz tone burst of 1 sec duration; the repetition period of the signal pulses is > 60 sec
3) The output voltage is measured 1 sec from the start of the pulse
4) Increase the input voltage until the output signal show a THD = 10%
5) The music power is then V2out/R1, where Vout is the output voltage measured in the condition of point 4) and R1 is the rated load impedance
The target of this method is to avoid excessive dissipation in the amplifier.
3/6
TDA7245A
Figure 3: Output Power vs. Supply Voltage
Figure 4:
Output Power vs. Supply Voltage
4/6
TDA7245A
POWERDIP 18 PACKAGE MECHANICAL DATA
mm
inch
TYP.
DIM.
MIN.
0.51
0.85
TYP.
MAX.
MIN.
0.020
0.033
MAX.
a1
B
b
1.40
0.055
0.50
0.020
b1
D
E
e
0.38
0.50
0.015
0.020
0.976
24.80
8.80
2.54
0.346
0.100
0.800
e3
F
20.32
7.10
5.10
0.280
0.201
I
L
3.30
0.130
Z
2.54
0.100
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TDA7245A
Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsibility for the
consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No
license is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics. Specification mentioned
in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. SGS-
THOMSON Microelectronics products are not authorized for use as critical components in life support devices or systems without express
written approval of SGS-THOMSON Microelectronics.
1997 SGS-THOMSON Microelectronics – Printed in Italy – All Rights Reserved
SGS-THOMSON Microelectronics GROUP OF COMPANIES
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Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdom - U.S.A.
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