2

LR745

Sym

Parameter

Min

Typ

Max

Units Conditions

V

OUT

Output voltage

18.0

-

24

V

I

V

17.7

-

24.3

V

I

O

C

I

OUT

Output current limiting

2.0

3.0

4.0

mA

---

V

IN

Operating input voltage range

35

-

450

V

---

I

INQ

Input quiescent current

-

-

500

µA

V

V

OFF

Output turn off voltage

12.6

13.25

13.9

V

---

V

12.3

13.25

14.2

V

T

O

C

V

RESET

Output reset voltage

6.3

7.0

7.7

V

---

V

6.0

7.0

8.0

V

T

O

C

I

OFF

V

-

-

75

µA

V

V

AUX

External voltage applied to V

OUT

-

-

22

V

---

I

AUX

Input current applied to V

OUT

-

-

500

µA

V

Electrical Characteristics

(Test conditions unless otherwise specified: T

Block Diagram

+

+

–

–

CLK

Clock

Reset

Q

GND

R D

V

OUT

V

OUT

V

IN

M2

M1

R1

R2

R3

2.0 to 4.0mA

R4

23V

V

Z

comp1

Reset

+

–

comp2

+

–

comp1