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LM3410XMFE Datasheet(PDF) 26 Page - Texas Instruments

Part # LM3410XMFE
Description  525kHz/1.6MHz, Constant Current Boost and SEPIC LED Driver with Internal Compensation
PDF  49 Pages
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

LM3410XMFE Datasheet(HTML) 26 Page - Texas Instruments

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4
FB
VIN
AGND
5
6
3
2
1
VIN
C1
DIM
C2
L1
PGND
PGND
C3
VO
SW
L2
D1
R1
LED1
VOUT
D =
¨
©
§
(VIN x K) +VOUT
¸
¹
·
VOUT
VIN
=
1 - D
D
x
K
¸
¹
·
¨
©
§
1
+
+
¸
¹
·
¨
©
§ RL1
¸
¸
¹
·
¨
¨
©
§ D2
D
2
'
¨
©
§RON
¸
¹
·
¸
¸
¹
·
¨
¨
©
§ D
D
2
'
1+
+
¸¸
¹
·
RL2
VD
VOUT
¨¨
©
§
K =
ROUT
ROUT
ROUT
¨
¨
¨
¨
¨
¨
©
§
¸
¸
¸
¸
¸
¸
¹
·
VOUT
ROUT =
ILED
LM3410, LM3410Q
SNVS541G – OCTOBER 2007 – REVISED MAY 2013
www.ti.com
(66)
Therefore:
(67)
One can see that all variables are known except for the duty cycle (D). A quadratic equation is needed to solve
for D. A less accurate method of determining the duty cycle is to assume efficiency, and calculate the duty cycle.
(68)
(69)
Table 7. Efficiencies for Typical SEPIC Applications
VIN
2.7V
VIN
3.3V
VIN
5V
VOUT
3.1V
VOUT
3.1V
VOUT
3.1V
IIN
770mA
IIN
600mA
IIN
375mA
ILED
500mA
ILED
500mA
ILED
500mA
η
75%
η
80%
η
83%
SEPIC Converter PCB Layout
The layout guidelines described for the LM3410 Boost-Converter are applicable to the SEPIC OLED Converter.
Figure 28 is a proper PCB layout for a SEPIC Converter.
Figure 28. HB/OLED SEPIC PCB Layout
26
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Copyright © 2007–2013, Texas Instruments Incorporated
Product Folder Links: LM3410 LM3410Q



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