TDA4950 查看數據表（PDF） - STMicroelectronics
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TDA4950 Datasheet PDF : 5 Pages
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TDA4950
BLOCK DIAGRAM
TDA4950
CURRENT LIMITER
7
8
COMPARATOR AND OUTPUT STAGE
VS - 3 VBE
Q1
Q13
Q4
Q2
R5
1
OP1
Q5
VREF
Q13
Q14
Q15
Q16
R2
Q17 Q18
D1
R5
OP2
R6
Q12
R7
Q21
R4
R3
Q19
Q20
R8
2
IIN
Q7
VS - 6 VBE
Q6
Q11
D2
Q10
D3
Q8
Q9
R9
Z1
R10 R11 R12 R13
OP3
IREF
Q22
6 +VS
5 OUTPUT
4 GND
FULL-WAVE RECTIFIER
PARABOLA NETWORK
CURRENT REFERENCE
3
ABSOLUTE MAXIMUM RATINGS
Symbol
VS
IS
Ptot
Tstg, Tj
Parameter
Supply Voltage
Supply Current
Power Dissipation at Tamb = 70 °C
Storage and Junction Temperature
Value
Unit
35
V
500
mA
800
mW
– 25, +150
°C
THERMAL DATA
Symbol
Rth (j-a)
Rth (j-c)
Parameter
Thermal Resistance Junction-ambient
Thermal Resistance Junction-pin (4)
Max.
Max.
Value
100
70
Unit
°C/W
°C/W
ELECTRICAL CHARACTERISTICS (Tamb = 25oC, VS = 26 V, Vfr = 0, S1 and S2 in "a" position,
refer to test circuit unless otherwise specified)
Symbol
VS
IS
Vref
– Iref
V7(A)
V7(B)
Parameter
Supply Voltage
Supply Current
Internal Reference Voltage
Internal Reference Current
Pin 7 Output Voltage
Pin 7 Output Voltage
Test Conditions
Vref/R3
Ifr = 0 µA, see Figure 2
Ifr = 30 µA, see Figure 2
Min. Typ. Max. Unit
17 24 30 V
4.5 7 mA
7.6 8.0 8.8 V
0.73
mA
15.3 16.0 16.7 V
15
V
2/5
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