TDA7245A Datasheet, PDF (3/6 Pages) STMicroelectronics – 6W AUDIO AMPLIFIER WITH STAND-BY

TDA7245A
ELECTRICAL CHARACTERISTICS (Refer to the test circuit, T_amb = 25°C, V_S = 16.5V, R_L = 4Ω, f =
1kHz; unless otherwise specified).
Symbol
V_S
V_O
I_d
P_O
Parameter
Supply Voltage
Quiescent Output Voltage
Quiescent Drain Current
Output Power
d
Harmonic Distortion
Test Condition
V_S = 24V
V_S = 28V
d = 1%
V_S = 16.5V, R_L = 4Ω
VS = 20V, RL = 8Ω
d = 10%
V_S = 16.5V, R_L = 4Ω
V_S = 20V, R_L = 8Ω
Music Power (*)
V_S = 24V, d = 10%, R_L = 4Ω
P_O = 50mW to 4W
f = 1KHz
f = 10KHz
Min. Typ. Max. Unit
12
30
V
11.6
V
24
35
mA
6
W
5
W
6.5
7.5
W
6.5
W
16
W
0.15 0.5
%
0.8
%
V_S = 20V, R_L = 8Ω,
P_O = 50mW to 3.5W
f = 1KHz
f = 10KHz
0.12
%
0.5
%
R_I
Input Impedance
f = 1kHz
30
KΩ
BW
Small signal bandwidth (-3dB) P_O = 1W
G_V
Voltage Gain (open loop)
f = 1KHz
20 to 40,000
Hz
75
dB
GV
Voltage Gain (closed loop)
f = 1KHz
39
40
41
dB
e_N
Total Input Noise
B = 22 - 22,000Hz
R_s = 50Ω
R_s = 1kΩ
R_s = 10kΩ
1.7
mV
2
µV
3
6
µV
S/N
Signal to Noise Ratio
P_O = 5W; R_S = 10KΩ
86
dB
SVR
Supply Voltage Rejection
V_S = 16.5V; R_L = 8Ω; f = 100Hz 38
45
dB
Rs = 10kΩ; Vr = 0.5Vrms
T _sd
Thermal shut-down Junction
Temperature
150
°C
STAND-BY FUNCTION
Symbol
V_st-by
Ist- by
ATT_st-by
V_t
I_{d st-by}
Parameter
Pin 5 DC Voltage
Pin 5 Current
Stand-by Attenuation
Stand-by Threshold (pin 5)
Quiescent Current @ Stand-by
Test Condition
SW1 Open (play)
SW1 Closed (st-by)
f = 1kHz
Min. Typ. Max. Unit
6.4
V
160 280
µA
70
90
dB
3.8
V
2
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 V^2out/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