Contents

HVLED007

2/33

DS12866 Rev 1

Contents

1

Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

2

Pin connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

3

Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

4

Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

4.1

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

4.2

Input current shaping function - operating principle . . . . . . . . . . . . . . . . . . 9

4.3

Operation of a Hi-PF QR flyback converter based on the HVLED007 . . . 13

4.4

4.5

Control input for isolated feedback and optocoupler driving (pin COMP) 17

4.6

Multiplier input for input voltage sensing (pin MULT) . . . . . . . . . . . . . . . . 19

4.7

Current sensing input (pin CS). Sense resistor (Rs) selection . . . . . . . . . 19

4.8

Zero current detection and triggering block (pin ZCD); starter . . . . . . . . . 22

4.9

Overload and short-circuit protection (OCP function) . . . . . . . . . . . . . . . . 23

4.10

Overvoltage protection (OVP function) . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

4.11

Soft-restart function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

4.12

Suggested step-by-step design procedure of a Hi-PF QR flyback converter

based on the HVLED0007 26

5

Referenced documents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

6

Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

7

Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32