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LM3424 Datasheet(PDF) 41 Page - Texas Instruments

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Part # LM3424
Description  Constant Current N-Channel Controller with Thermal Foldback for Driving LEDs
PDF  69 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

LM3424 Datasheet(HTML) 41 Page - Texas Instruments

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background image
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
674
2
x
¸¸
¹
·
¨¨
©
§
A
1
x
533
.
0
A
1
PP
-
=
=
L
D
V
IN x
f
1
L
SW
x
kHz
04
5
H
33
x
2
467
.
0
V
4
2
x
mA
674
=
i
=
=
D
V
IN x
f
SW
x
467
.
0
V
4
2
x
2H
32
=
1
L
PP
-
i
L
kHz
04
5
700 mA x
k
24.3
R
BIAS =
k
49.9
R
R
REF2 =
=
REF1
6.81
R
GAIN =
k
:
=
x
-
=
x
-
=
k
68
.
6
2
1
R
R
GAIN
GAIN
¸¸
¹
·
¸¸
¹
·
¨¨
©
§
¨¨
©
§
V
45
.
2
V
45
.
2
PA
100
I
CSH
+ R
R
2
REF
1
REF
+
-
R
R
BIAS
END
NTC
-
R
END
NTC
R
1
REF
:
+
:
k
24.3
k
7.15
:
k
7.15
:
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
LM3424, LM3424-Q1
www.ti.com
SNVS603C – AUGUST 2009 – REVISED AUGUST 2015
Typical Applications (continued)
(110)
Assume RCSH = 12.4 kΩ and solve for RHSP:
(111)
The closest standard resistor for RSNS is actually 0.1Ω and for RHSP is actually 1 kΩ therefore ILED is:
(112)
The chosen components from step 3 are:
(113)
8.2.2.2.4
Thermal Foldback
Find the resistances corresponding to TBK and TEND (RNTC-BK = 24.3 kΩ and RNTC-END = 7.15 kΩ) from the
manufacturer's datasheet. Assuming RREF1 = RREF2 = 49.9 kΩ, then RBIAS = RNTC-BK= 24.3 kΩ.
Solve for RGAIN:
(114)
The chosen components from step 4 are:
(115)
8.2.2.2.5
Inductor Ripple Current
Solve for L1:
(116)
The closest standard inductor is 33 µH therefore
ΔiL-PP is:
(117)
Determine minimum allowable RMS current rating:
(118)
The chosen component from step 5 is:
Copyright © 2009–2015, Texas Instruments Incorporated
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Product Folder Links: LM3424 LM3424-Q1



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