IS31LT3918

Integrated Silicon Solution, Inc. – www.issi.com

Rev. A, 09/01/2011

8

Appendix: Typical application circuit of DC voltage input using a single External NMOS

IS3918

Gate

CS

ADJ

TOFF

VIN

DIM1

DIM2

GND

LED+

LED-

Roff

Rcs

Q1

Cin

Rin

D1

L1

Cout

Vin DC 6-150V

Cin

Note:

In the above configuration, it is important to pay attention to the VGSON value for Q1. IS31LT3918 provides a maximum gate drive of

4.5V (typ), thus requiring that a low threshold voltage NMOS be used.

IS31LT3918