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LM3414HVSD 데이터시트(PDF) 11 Page - Texas Instruments |
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11 / 25 page (VIN -VLED) 2L x VIN x fSW VLED 'IL = + ILED(AVG) VIN -VLED 1.2 x ILED x LMIN = VLED VIN x 1 fSW VIN - VLED L x D x T 'IL = ILED ILX IL1 1/fSW tON Time ILED = IL(AVERAGE) = Mid-point of ILX during tON LM3414, LM3414HV www.ti.com SNVS678E – JUNE 2010 – REVISED MAY 2013 Figure 16. Waveforms of a Floating Buck LED Driver with PLM INDUCTOR SELECTION To ensure proper output current regulation, the LM3414/14HV must operate in Continuous Conduction Mode (CCM). With the incorporation of PLM, the peak-to-peak inductor current ripple can be set as high as ±60% of the defined average output current. The minimum inductance of the inductor is decided by the defined average LED current and allowable inductor current ripple. The minimum inductance can be found by the equations shown below: Since: (4) Thus: (5) The LM3414/14HV can maintain LED current regulation without output filter capacitor. This is because the inductor of the floating buck structure provides continuous current to the LED throughout the entire switching cycle. When LEDs are driven without filter capacitor, the LED peak current must not set exceeding the rated current of the LED. The peak LED current is governed by the following equation: (6) INTERNAL N_MOS POWER SWITCH The LM3414/14HV features an integrated N-channel power MOSFET that connects between the LX and GND pins for power switching. With the switch turned ON, the resistance across the LX and GND pins is 1.8 Ω maximum. Copyright © 2010–2013, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: LM3414 LM3414HV |
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