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LM3421 датащи(PDF) 39 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
Logo TI1 - Texas Instruments

LM3421 датащи(HTML) 39 Page - Texas Instruments

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D
I
LED x
=
'i
PP
-
LED
SW
f
x
r
D x CO
2
=
=
kHz
01
5
95
.
1
x
x
:
1 mA
467
.
0
A
1 x
F
40 P
'i
PP
-
LED
f
'i
r
SW
PP
-
LED
D
x
x
D
I
LED x
C
O =
2
=
F
39.8 P
=
kHz
01
5
mA
1
95
.
1
x
x
:
467
.
0
A
1 x
C
O
H
33
1
L
P
=
A
89
.
1
12
1
1
I
RMS
L
=
+
x
=
-
I
I
LED
RMS
L
x
=
-
12
1
1
2
x
+
¸
¸
¹
·
¨
¨
©
§
D
i
PP
L
c
x
'
-
I
LED
Dc
533
.
0
mA
678
2
x
¸¸
¹
·
¨¨
©
§
A
1
x
533
.
0
A
1
PP
-
=
=
L
D
V
IN x
f
1
L
SW
x
kHz
01
5
H
33
x
P
467
.
0
V
4
2
x
mA
678
=
'i
=
=
D
V
IN x
f
SW
x
467
.
0
V
4
2
x
PH
32
=
1
L
PP
-
'i
L
kHz
01
5
700 mA x
:
k
4
.
2
1
R
CSH =
:
k
1
R
R
HSN =
=
HSP
0.1
R
NS
S
=
:
I
LED =
=
k
0
.
1
1.24V
:
x
A
0
.
1
=
k
4
.
12
1
.
0
:
x
:
R
R
CSH
SNS x
R
1.24V
HSP
x
=
1.24V
1.24V
=
R
HSP
:
=
k
0
.
1
:
x
:
x
0.1
k
12.4
A
1
x
x
R
R
I
SNS
CSH
LED
:
=
=
=
1
.
0
1A
R
SNS
I
LED
mV
100
V
SNS
LM3421, LM3421-Q1
LM3423, LM3423-Q1
www.ti.com
SNVS574D – JULY 2008 – REVISED SEPTEMBER 2011
(104)
Assume RCSH = 12.4 kΩ and solve for RHSP:
(105)
The closest standard resistor for RSNS is actually 0.1Ω and for RHSP is actually 1 kΩ therefore ILED is:
(106)
The chosen components from step 3 are:
(107)
4. INDUCTOR RIPPLE CURRENT
Solve for L1:
(108)
The closest standard inductor is 33 µH therefore
ΔiL-PP is:
(109)
Determine minimum allowable RMS current rating:
(110)
The chosen component from step 4 is:
(111)
5. OUTPUT CAPACITANCE
Solve for CO:
(112)
The closest capacitance totals 40 µF therefore
ΔiLED-PP is:
(113)
Determine minimum allowable RMS current rating:
Copyright © 2008–2011, Texas Instruments Incorporated
Submit Documentation Feedback
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Product Folder Links: LM3421 LM3421-Q1 LM3423 LM3423-Q1



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