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SM8135AB Fiches technique(PDF) 5 Page - Nippon Precision Circuits Inc

No de pièce SM8135AB
Description  White LED Driver IC
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Fabricant  NPC [Nippon Precision Circuits Inc]
Site Internet  http://www.npc.co.jp/en
Logo NPC - Nippon Precision Circuits Inc

SM8135AB Fiches technique(HTML) 5 Page - Nippon Precision Circuits Inc

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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
0
10
20
30
40
50
0
100
RSET [k
Ω]
200
300
400
500


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