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

V

I

REF

V

REF

TDA4950

BLOCK DIAGRAM

ABSOLUTE MAXIMUM RATINGS

Symbol

Parameter

Value

Unit

Supply Voltage

35

V

Supply Current

500

mA

°C

800

mW

Storage and Junction Temperature

– 25, +150

°C

THERMAL DATA

Symbol

Parameter

Value

Unit

Thermal Resistance Junction-ambient

Max.

100

°C/W

Thermal Resistance Junction-pin (4)

Max.

70

°C/W

refer to test circuit unless otherwise specified)

Symbol

Parameter

Test Conditions

Min.

Typ.

Max.

Unit

Supply Voltage

17

24

30

V

Supply Current

4.5

7

mA

Internal Reference Voltage

7.6

8.0

8.8

V

Internal Reference Current

0.73

mA

Pin 7 Output Voltage

µA, see Figure 2

15.3

16.0

16.7

V

Pin 7 Output Voltage

µA, see Figure 2

15

V

TDA4950

2/5