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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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LP3954TLX/NOPB 데이터시트(PDF) 24 Page - Texas Instruments |
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LP3954TLX/NOPB 데이터시트(HTML) 24 Page - Texas Instruments |
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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 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 Submit Documentation Feedback Copyright © 2005–2013, Texas Instruments Incorporated Product Folder Links: LP3954 |
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