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TDA4950 Datasheet(PDF) 2 Page - STMicroelectronics

Part No. TDA4950
Description  TV EAST/WEST CORRECTION CIRCUIT
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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 2 page
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4
5
6
7
8
Q15
Q16
Q14
Q18
Q17
R2
R4
D1
Q13
R5
OUTPUT
Q12
R6
R7
Q21
Q19
Q20
R8
R3
OP2
COMPARATOR AND OUTPUT STAGE
Q4
Q13
Q2
Q1
CURRENT LIMITER
R5
Q5
OP1
Q6
Q7
Q8
Q9
Q10
Q11
R9
R10
R11
R12
R13
2
1
OP3
D2
D3
Z1
Q22
3
FULL-WAVE RECTIFIER
PARABOLA NETWORK
CURRENT REFERENCE
GND
+V
S
I
IN
V
S - 6 VBE
V
S - 3 VBE
I
REF
V
REF
TDA4950
BLOCK DIAGRAM
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
VS
Supply Voltage
35
V
IS
Supply Current
500
mA
Ptot
Power Dissipation at Tamb = 70
°C
800
mW
Tstg, Tj
Storage and Junction Temperature
– 25, +150
°C
THERMAL DATA
Symbol
Parameter
Value
Unit
Rth (j-a)
Thermal Resistance Junction-ambient
Max.
100
°C/W
Rth (j-c)
Thermal Resistance Junction-pin (4)
Max.
70
°C/W
ELECTRICAL CHARACTERISTICS (Tamb = 25
oC, VS = 26 V, Vfr = 0, S1 and S2 in "a" position,
refer to test circuit unless otherwise specified)
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
VS
Supply Voltage
17
24
30
V
IS
Supply Current
4.5
7
mA
Vref
Internal Reference Voltage
7.6
8.0
8.8
V
– Iref
Internal Reference Current
Vref/R3
0.73
mA
V7(A)
Pin 7 Output Voltage
Ifr = 0
µA, see Figure 2
15.3
16.0
16.7
V
V7(B)
Pin 7 Output Voltage
Ifr = 30
µA, see Figure 2
15
V
TDA4950
2/5




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