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LP8860 calculate of ISET

I want to set LED current to 150mA by external resistance only, not from setting EEPROM register.

Please tell me how to calculate value of RISET.

  • Hi Kei,

    Kei Sato73562 said:

    I want to set LED current to 150mA by external resistance only, not from setting EEPROM register.

    Please tell me how to calculate value of RISET.

    Simplified formula: ILED= (24/RISET)*150, where RISET kOhms. ILED mA

    For you case RISET = 24k

    EEPROM context:

    LED_CURRENT_CTRL[11:0] = 0xFFF (addr 0x60, 0x61) - max current

    DRV_LED_CURRENT_SCALE[2:0] = b111 (addr 0x63) - scale 150mA

    EN_EXT_LED_CUR_CTRL = 1 (addr 0x66) - external resistor control enabled

    Best regards,

    Vladimir