LP3954TLXSLASHNOPB datasheet(24/58 Pages) TI2

tên linh kiện	LP3954TLX/NOPB

Giải thích chi tiết về linh kiện	Advanced Lighting Management Unit

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24 / 58 page

LP3954

SNVS340D – JUNE 2005 – REVISED MARCH 2013

www.ti.com

Figure 20. Output Current vs Pin Voltage (Current

Figure 21. Pin Voltage vs Output Current (Switch

Sink Mode)

Mode)

Figure 22. Output Current vs RRGB (Current Sink Mode)

Single High Current Driver

LP3954 has internal constant current driver that is capable for driving high current mainly targeted for FLASH

LED in camera phone applications.

MAXIMUM CURRENT SETUP FOR FLASH

The user sets the maximum current of FLASH with RFLASH resistor based on following equation:

IMAX = 300 × 1.23V / (RFLASH + 50Ω),

(3)

where

Imax = maximum flash current in Amps (ie. 0.3A)

1.23V = reference voltage

300 = internal current mirror multiplier

RFLASH = Resistor value in Ohms

Ω = Internal resistor in the IFLASH input

For example if 300mA is required for maximum flash current RFLASH equals to

RFLASH = 300 × 1.23V / IMAX – 50Ω = 369V / 0.3A – 50Ω = 1.18kΩ

(4)

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LP3954TLX/NOPB bảng dữ liệu(PDF) 24 Page - Texas Instruments