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LM3414HVSD 데이터시트(PDF) 11 Page - Texas Instruments

부품명 LM3414HVSD
상세설명  1A 60W Common Anode Capable Constant Current Buck LED Driver Requires No
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(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
maximum.
Copyright © 2010–2013, Texas Instruments Incorporated
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