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LM3421 датащи(PDF) 41 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) 41 Page - Texas Instruments

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A
1
I
I
LED
MAX
D
=
=
-
V
91
V
21
V
70
V
V
V
O
MAX
IN
MAX
RD
=
+
=
+
=
-
-
Q1 o 32A, 100V, DPAK
mW
82
m
50
A
28
.
1
R
I
P
2
DSON
2
RMS
T
T
=
:
x
=
x
= -
x
I
RMS
T
=
-
I
LED
D
c
=
x
A
28
.
1
=
0.467
A
1
533
.
0
D
=
A
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A
1 =
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677
.
0
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677
.
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MAX
T-
V
91
V
21
V
70
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V
V
O
MAX
IN
MAX
T
=
+
=
+
=
-
-
CIN = 4 x 4.7 PF
x
A
1
=
I
LED
I
RMS
IN-
=
1- 0.677
677
.
0
1.45A
x
1- DMAX
DMAX
=
C
IN
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=
kHz
504
mV
100
x
467
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0
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1 x
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27
.
9
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PP
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x
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FS
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CMP
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10
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=
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28
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1
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=
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FS
10: x
sec
rad
k
360
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Z
x
LM3421, LM3421-Q1
LM3423, LM3423-Q1
www.ti.com
SNVS574D – JULY 2008 – REVISED SEPTEMBER 2011
(125)
The chosen components from step 7 are:
(126)
8. INPUT CAPACITANCE
Solve for the minimum CIN:
(127)
To minimize power supply interaction a 200% larger capacitance of approximately 20 µF is used, therefore the
actual
ΔvIN-PP is much lower. Since high voltage ceramic capacitor selection is limited, four 4.7 µF X7R capacitors
are chosen.
Determine minimum allowable RMS current rating:
(128)
The chosen components from step 8 are:
(129)
9. NFET
Determine minimum Q1 voltage rating and current rating:
(130)
(131)
A 100V NFET is chosen with a current rating of 32A due to the low RDS-ON = 50 mΩ. Determine IT-RMS and PT:
(132)
(133)
The chosen component from step 9 is:
(134)
10. DIODE
Determine minimum D1 voltage rating and current rating:
(135)
(136)
A 100V diode is chosen with a current rating of 12A and VD = 600 mV. Determine PD:
Copyright © 2008–2011, Texas Instruments Incorporated
Submit Documentation Feedback
41
Product Folder Links: LM3421 LM3421-Q1 LM3423 LM3423-Q1



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