SM8135A datasheet(5/20 Pages) NPC

部品番号	SM8135A

部品情報	White LED Driver IC

PDF	20 Pages

Scroll/Zoom	100%

メーカー	NPC [Nippon Precision Circuits Inc]

ホームページ	http://www.npc.co.jp/en

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SM8135A

SEIKO NPC CORPORATION —5

FUNCTIONAL DESCRIPTION

LED Drive Current Setting

The SM8135A LED drive current can be set using a combination of 2 methods: (1) current setting resistance

connected to ISET, and (2) PWM signal input 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 60k

Ω. 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

RSET vs. ILED MAX

100

RSET [k

Ω]

200

300

400

500

SM8135A データシート(PDF) 5 Page - Nippon Precision Circuits Inc