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LM3421 Datasheet(PDF) 40 Page - Texas Instruments

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Part # LM3421
Description  N-Channel Controllers for Constant Current LED Drivers
PDF  65 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

LM3421 Datasheet(HTML) 40 Page - Texas Instruments

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ZP3 = (max ZP1, ZZ1) x 10 = ZZ1 x 10
ZP3 = 36k sec
rad
x 10 = 360k
sec
rad
F
30
.
0
1
1
C
CMP
P
=
=
=
675
.
0
e
5
sec
rad
6
x
:
e
5
6
2
P x
Z
:
=
=
sec
rad
675
.
0
=
sec
rad
k
19
min(ZP1, ZZ1)
ZP2 =
5 x TU0
ZP1
5 x 5630
5 x 5630
=
T
0
U =
5630
=
04
.
0
A
1
467
.
1
:
x
x
V
620
533
.
0
x
(
)
D
1+
R
I
LIM
LED x
x
V
620
D
x
c
sec
rad
k
36
=
=
=
533
.
0
95
.
1
2
x
:
H
33
467
.
0
P
x
D
r
2
D
c
x
L1
D x
1
Z
Z
sec
rad
k
19
=
=
=
1.467
F
40
1.95:
P
x
CO
r
D x
D
1+
1
P
Z
0.04:
R
LIM =
:
04
.
0
=
=
=
6.13A
mV
245
mV
245
I
LIM
R
LIM
:
=
=
=
041
.
0
6A
R
LIM
mV
245
mV
245
I
LIM
CO = 4 x 10 PF
x
A
1
=
I
LED
I
RMS
CO-
=
1- 0.677
677
.
0
1.45A
x
1- DMAX
DMAX
=
LM3421, LM3421-Q1
LM3423, LM3423-Q1
SNVS574D – JULY 2008 – REVISED SEPTEMBER 2011
www.ti.com
(114)
The chosen components from step 5 are:
(115)
6. PEAK CURRENT LIMIT
Solve for RLIM:
(116)
The closest standard resistor is 0.04
Ω therefore ILIM is:
(117)
The chosen component from step 6 is:
(118)
7. LOOP COMPENSATION
ωP1 is approximated:
(119)
ωZ1 is approximated:
(120)
TU0 is approximated:
(121)
To ensure stability, calculate
ωP2:
(122)
Solve for CCMP:
(123)
To attenuate switching noise, calculate
ωP3:
(124)
Assume RFS = 10Ω and solve for CFS:
40
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Copyright © 2008–2011, Texas Instruments Incorporated
Product Folder Links: LM3421 LM3421-Q1 LM3423 LM3423-Q1



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