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LP3954TLX/NOPB Datasheet(PDF) 24 Page - Texas Instruments

Part # LP3954TLX/NOPB
Description  Advanced Lighting Management Unit
PDF  58 Pages
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Manufacturer  TI2 [Texas Instruments]
Direct Link  https://www.ti.com
Logo TI2 - Texas Instruments

LP3954TLX/NOPB Datasheet(HTML) 24 Page - Texas Instruments

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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
50
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)
24
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Copyright © 2005–2013, Texas Instruments Incorporated
Product Folder Links: LP3954



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