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LR745

High-Input Voltage SMPS Start-up

Microchip Technology 

LR745

1.0 ELECTRICAL CHARACTERISTICS

ABSOLUTE MAXIMUM RATINGS

Input Voltage .................................................................................................................................................................................. 450V

Output voltage.................................................................................................................................................................................. 25V

Operating and storage temperature ............................................................................................................................. -55°C to +150°C

Note: Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress

rating only and functional operation of the device at those or any other conditions, above those indicated in the operational listings of

this specification, is not implied. Exposure to maximum rating conditions for extended periods may affect device reliability.

1.1 ELECTRICAL SPECIFICATIONS

TABLE 1-1: ELECTRICAL CHARACTERISTICS1

Symbol Parameter

Min Typ Max Units Conditions

VOUT

IOUT

VIN

IINQ

VOFF

VRESET

IOFF

VAUX

IAUX

Output voltage

VOUT over temperature

Output current limiting

Operating input voltage range

Input quiescent current

Output turn off voltage

VOFF over temperature

Output reset voltage

VRESET over temperature

VIN off-state leakage current

External voltage applied to

VOUT

Input current applied to VOUT

18.0

24

V

17.7

24.3 V

2.0 3.0 4.0 mA

35

450

V

500 µA

12.6 13.25 13.9 V

12.3 13.25 14.2 V

6.3 7.0 7.7

V

6.0 7.0 8.0

V

75 µA

22

V

500 µA

1 Test Conditions unless otherwise specified: TA = 25°C, VIN = 450V

IOUT= 0

IOUT= 0, TA= -40°C to +85°C

VIN= 400V, IOUT= 0

TA= -40°C to +85°C

TA= -40°C to +85°C

VIN= 400V

VAUX= 22V

TABLE 1-2:

THERMAL CHARACTERISTICS

Package

TO-92

TO-243AA (SOT-89)

θja

132°C/W

133°C/W

 2015 Microchip Technology Inc.

DS20005394A-page 3

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