tda7250.pdf

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60W HI-FI DUAL AUDIO DRIVER
TDA7250
60 W HI-FI DUAL AUDIO DRIVER
. WIDE SUPPLY VOLTAGE RANGE : 20 TO 90 V
( ± 10 to ± 45 V)
CONTROL FOR THE POWER TRANSISTORS
WITHOUT TEMPERATURE SENSE
ELEMENTS
. OVERLOAD CURRENT PROTECTION FOR
. LOW POWER CONSUMPTION
. OUTPUT POWER 60 W/8 W AND 100 W/4 W
DESCRIPTION
The TDA7250 stereo audio driver is designed to
drive two pair of complementary output transistor in
the Hi-Fi power amplifiers.
DIP20
ORDERING NUMBER : TDA7250
APPLICATION CIRCUIT
March 1995
1/11
. VERY LOW DISTORTION
. AUTOMATIC QUIESCENT CURRENT
. MUTE/STAND-BY FUNCTIONS
THE POWER TRANSISTORS
199643496.002.png
TDA7250
PIN CONNECTION (top view)
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
V s
Supply Voltage
100
V
P tot
Power Dissipation at T amb =60
°
C
1.4
W
T j ,T stg Storage and Junction Temperature
– 40 to + 150
C
THERMAL DATA
Symbol
Parameter
Value
Unit
R th j-amb Thermal Resistance Junction-ambient
Max.
65
°
C/W
2/11
°
199643496.003.png
TDA7250
PIN FUNCTIONS
N
°
Name
Function
1 S – POWER SUPPLY
Negative Supply Voltage.
2
NON–INV. INP. CH. 1
Channel 1 Input Signal.
3
QUIESC. CURRENT
CONTR. CAP. CH1
This capacitor works as an integrator, to control the quiescent current to output
devices in no-signal conditions on channel 1.
4
SENSE (–) CH. 1
Negative voltage sense input for overload protection and for automatic quiescent
current control.
5
ST. BY / MUTE / PLAY
Three-functions Terminal.
For V IN = 1 to 3 V, the device is in MUTE and only quiescent current flows in
the power stages ; - for V IN < 1 V, the device is in STAND-BY mode and no
quiescent current is present in the power stages ; - for V IN > 3 V, the devic
6
CURRENT PROGRAM
High Impedance Power-stages Monitor.
7
SENSE (–) CH. 2
Negative Voltage Sense Input for Overload Protection and for Automatic
Quiescent Current Control.
8
QUIESC. CURRENT
CONTR. CAP. CH. 2
This capacitor works as an integrator, to control the quiescent current to output
devices in no-signal conditions on channel 2. If the voltage at its terminals drops
under 250 mV, it also resets the device from high-impedance state of output
stages.
9
NON–INV. INP. CH. 2
Channel 2 Input Signals.
10
V s – POWER SUPPLY
Negative Supply Voltage.
11
INVERT. INP. CH. 2
Feedback from Output (channel 2).
12
OUT (–) CH. 2
Out Signal to Lower Driver Transistor of Channel 2.
13
OUT (+) CH. 2
Out Signal to Higher Driver Transistor of Channel 2.
14
SENSE (+) CH. 2
Positive Voltage Sense Input for Overload Protection and for Automatic
Quiescent Current Control.
15
COMMON AC GROUND AC Input Ground in MUTE Condition.
16
V S + POWER SUPPLY
Positive Supply Voltage.
17
SENSE (+) CH. 1
Positive Voltage Sense Input for Overload Protection and for Automatic
Quiescent Current Control.
18
OUT (+) CH. 1
Out Signal to High Driver Transistor of Channel 1.
19
OUT (–) CH. 1
Out Signal to Low Driver Transistor of Channel 1.
20
INVERT. INP. CH. 1
Feedback from Output (channel 1).
3/11
199643496.004.png
TDA7250
BLOCK DIAGRAM
4/11
199643496.005.png
TDA7250
ELECTRICAL CHARACTERISTICS (T amb =25 ° C, V s =
±
35 V, play mode, unless otherwise
specified)
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
V s
Supply Voltage
±
10
±
45
V
I d
Quiescent Drain Current
Stand-by Mode
8
mA
Play Mode
10
14
I b
Input Bias Current
0.2
1
m
A
V os
Input Offset Voltage
1
±
10
mV
I os
Input Offset Current
100
200
nA
G v
Open Loop Voltage Gain
f = 100 Hz
90
dB
f = 10 kHz
60
e N
Input Noise Voltage
W
B = 20 Hz to 20 kHz
3
m
V
SR
Slew Rate
10
V/
m
s
d
Total Harmonic Distortion
G v = 26 dB, P o =40W
f = 1 kHz
f = 20 kHz
0.004
0.03
%
%
V opp
Output Voltage Swing
60
V pp
P o
Output Power (*)
V s =
±
35 V, R L =8 W
60
40
100
W
W
W
V s =
±
30 V, R L =8
W
V s =
±
35 V, R L =4
W
I o
Output Current
±
5
mA
SVR
Supply Voltage Rejection
f = 100 Hz
75
dB
C s
Channel Separation
f = 1 kHz
75
dB
MUTE / STANDBY/ PLAY FUNCTIONS
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
I i
Input Current (pin 5)
0.1
m
A
V th
Comparator Standby / Mute
Threshold (**)
1.0
1.25
1.5
V
H
Hysteresis Standby / Mute
200
mV
V th
Comparator Mute / Play
Threshold (**)
2.4
3.0
3.6
V
H
Hysteresis Mute / Play
300
mV
Mute Attenuation
f = 1 kHz
60
dB
V i
Input Voltage Max. (pin 5)
12 (**)
V
(*) Appli cation circuit of fig. 1
f = 1 KHz ;
d = 0.1 % ;
G v =26 dB.
(**) Referred to
-
V s .
CURRENT SURVEY CIRCUITRY
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
Comparator Reference
to + V S
to – V S
0.8
0.8
1
1
1.4
1.4
V
V
t d
Delay Time
10
m
s
QUIESCENT CURRENT CONTROL
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
Capacitor Current
Charge
Discharge
30
250
60
500
m
A
m
A
Comparator Reference
to + V S
to – V S
10
20
10
25
mV
mV
5/11
R G = 600
199643496.001.png

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