SM8135B データシートの表示（PDF） - Nippon Precision Circuits

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SM8135B

White LED Driver IC

Nippon Precision Circuits  

SM8135B

FUNCTIONAL DESCRIPTION

LED Drive Current Setting

The SM8135B LED drive current can be set using a combination of 2 methods: (1) current setting resistance

connected to ISET, and (2) input pulse control on the EN pin.

(1) Setting LED drive current using RSET

The LED drive maximum current value per LED (ILED MAX) is determined by the resistor (RSET) connected

to the ISET pin. The relationship between RSET and ILED MAX is given by the following equation.

ILED MAX [mA] = 2400/RSET [kΩ]

(For example, ILED MAX = 20mA when RSET = 120kΩ.)

The RSET resistance has a minimum rating of 60kΩ. At this value of resistance, the ILED MAX has a maximum

rating of 40mA/LED. However, note that the total LED drive current for all LEDs must not exceed 80mA.

ISET

RSET

GND

50

40

30

20

10

0

0

100

200

300

400

500

RSET [kΩ]

RSET vs. ILED MAX

SEIKO NPC CORPORATION —5

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