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LM3410XMFE Scheda tecnica(PDF) 11 Page - Texas Instruments

Il numero della parte LM3410XMFE
Spiegazioni elettronici  525kHz/1.6MHz, Constant Current Boost and SEPIC LED Driver with Internal Compensation
PDF  49 Pages
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Produttore elettronici  TI [Texas Instruments]
Homepage  http://www.ti.com
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LM3410XMFE Scheda tecnica(HTML) 11 Page - Texas Instruments

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VOUT - KVIN
D =
VOUT
VOUT x ILED
K =
VIN x IIN
'¶
K
VOUT
VIN
=
VOUT - VIN
D =
VOUT
1 - D
1
1
=
c
D
=
VOUT
VIN
¨
©
§
¸
¹
·
=
2'iL
DTS
'i
L =
¨¨
©
§
L
VIN
¸¸
¹
·
¨¨
©
§
2L
VIN
¸¸
¹
·
x DTS
t
L
i
L
i
'
S
T
S
DT
( )
t
L
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L
VIN
L
V
V
OUT
IN -
LM3410, LM3410Q
www.ti.com
SNVS541G – OCTOBER 2007 – REVISED MAY 2013
Figure 17. Inductor Current
(3)
The Duty Cycle (D) for a Boost converter can be approximated by using the ratio of output voltage (VOUT) to input
voltage (VIN).
(4)
Therefore:
(5)
Power losses due to the diode (D1) forward voltage drop, the voltage drop across the internal NMOS switch, the
voltage drop across the inductor resistance (RDCR) and switching losses must be included to calculate a more
accurate duty cycle (See Calculating Efficiency and Junction Temperature for a detailed explanation). A more
accurate formula for calculating the conversion ratio is:
Where
•
η equals the efficiency of the LM3410 application.
(6)
Or:
(7)
Therefore:
(8)
Inductor ripple in a LED driver circuit can be greater than what would normally be allowed in a voltage regulator
Boost and Sepic design. A good design practice is to allow the inductor to produce 20% to 50% ripple of
maximum load. The increased ripple shouldn’t be a problem when illuminating LEDs.
Copyright © 2007–2013, Texas Instruments Incorporated
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Product Folder Links: LM3410 LM3410Q



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