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LM3421 датащи(PDF) 34 Page - Texas Instruments

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номер детали LM3421
подробное описание детали  N-Channel Controllers for Constant Current LED Drivers
PDF  65 Pages
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производитель  TI1 [Texas Instruments]
домашняя страница  http://www.ti.com
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LM3421 датащи(HTML) 34 Page - Texas Instruments

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1-DMAX
DMAX
ICIN-RMS = ILED x
12
ICIN-RMS =
'iL-PP
(1-DMID)
D
I
I
LED
RMS
CIN
x
x
=
-
MID
CIN =
'VIN-PP x fSW
ILED x D
CIN =
8 x 'VIN-PP x fSW
'iL-PP
300673
CIN =
ILED x (1 - D) x D
'VIN-PP x fSW
x
=
0
U
T
T
-
1
¸
¸
¹
·
¨
¨
©
§
s
Z
1
Z
x
x
+
1
¸
¸
¹
·
¨
¨
©
§
s
Z
3
P
+
1
¸
¸
¹
·
¨
¨
©
§
s
Z
2
P
+
1
¸
¸
¹
·
¨
¨
©
§
s
Z
1
P
x
=
0
U
T
T
1
x
x
+
1
¸
¸
¹
·
¨
¨
©
§
s
Z
3
P
+
1
¸
¸
¹
·
¨
¨
©
§
s
Z
2
P
+
1
¸
¸
¹
·
¨
¨
©
§
s
Z
1
P
1
=
C
FS
3
P
10
x Z
300
max
3
P =
Z
(
) 10
,
1
Z
1
P
x
Z
Z
LM3421, LM3421-Q1
LM3423, LM3423-Q1
SNVS574D – JULY 2008 – REVISED SEPTEMBER 2011
www.ti.com
(65)
(66)
The total system loop gain (T) can then be written as:
Buck
(67)
Boost and Buck-boost
(68)
8. INPUT CAPACITANCE
Set the nominal input voltage ripple (
ΔvIN-PP) by solving for the required capacitance (CIN):
Buck
(69)
Boost
(70)
Buck-boost
(71)
Use DMAX to set the worst case input voltage ripple, when solving for CIN in a buck-boost regulator and DMID = 0.5
when solving for CIN in a buck regulator.
The minimum allowable RMS input current rating (ICIN-RMS) can be approximated:
Buck
(72)
Boost
(73)
Buck-boost
(74)
34
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Copyright © 2008–2011, Texas Instruments Incorporated
Product Folder Links: LM3421 LM3421-Q1 LM3423 LM3423-Q1



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