SM8121A Ver la hoja de datos (PDF) - Nippon Precision Circuits

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SM8121A

White LED Driver IC

Nippon Precision Circuits  

SM8121A

Current Switching using External Transistors

If only a few brightness steps are required, the LED current can be adjusted by switching the LED current set-

ting resistance using external transistors (Tr).

VIN

3.6V

L

10µH

CIN

4.7µF

SBD

COUT

1.0µF

SW

VDD

VSS

SM8121

LED

FB

CE

Select signal 1

Select signal 2

R3

40Ω

Tr2

R2

100Ω

Tr1

R1

250Ω

Select signal 2

Low

Low

High

High

Select signal 1

Low

High

Low

High

ILED

2mA

2 + 5 = 7mA

2 + 12.5 = 14.5mA

2 + 5 + 12.5 = 19.5mA

NIPPON PRECISION CIRCUITS INC.—13

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