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LM3404 Scheda tecnica(PDF) 9 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
Il numero della parte LM3404
Spiegazioni elettronici  LM3402/LM3404 Fast Dimming and True Constant LED Current Evaluation Board
Download  18 Pages
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Produttore elettronici  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM3404 Scheda tecnica(HTML) 9 Page - National Semiconductor (TI)

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Example 3 On & Off Times
Three Series LEDs
V
IN (V)
V
OUT (V)
R
ON
t
ON
t
OFF
36
10.4
113 k
Ω
5.92E-07
1.09E-07
48
10.4
113 k
Ω
4.03E-07
1.12E-06
60
10.4
113 k
Ω
3.06E-07
1.14E-06
Four Series LEDs
36
13.8
113 k
Ω
6.83E-07
7.78E-07
48
13.8
113 k
Ω
4.43E-07
8.21E-07
60
13.8
113 k
Ω
3.28E-07
8.41E-07
Five Series LEDs
36
17.2
113 k
Ω
8.06E-07
5.77E-07
48
17.2
113 k
Ω
4.92E-07
6.34E-07
60
17.2
113 k
Ω
3.54E-07
6.59E-07
Calculate Switching Frequency
Example 3 Switching Frequency
V
IN (V)
V
OUT (V)
f
SW (kHz)
Three Series LEDs
36
10.4
595
48
10.4
656
60
10.4
692
Four Series LEDs
36
13.8
685
48
13.8
791
60
13.8
855
Five Series LEDs
36
17.2
723
48
17.2
888
60
17.2
987
Calculate Inductor Value
Therefore:
You can quickly see one benefit of the modified circuit. The
improved circuit eliminates the input and output voltage vari-
ation on RMS current.
•
I
F = 500 mA (typical application)
•
Δi
L = 250 mA (target)
•
R
ON= 113 kΩ
•
L = 59 µH (68 µH standard value)
•
Δi
L = 223 mA (L = 68 µH all combinations)
Calculate R
SNS
Original R
SNS equation:
Substitute improved circuit t
ON calculation:
Simplified:
Typical Application:
•
V
OUT = 13.8V
•
I
F = 500 mA
•
R
ON= 113 kΩ
•
L = 68 µH
•
t
D = 220 ns
R
SNS = 462 mΩ
This equation shows that only variations in V
OUT will affect the
average current over the entire application range. These vari-
ations should be very minor even with large variations in
output voltage.
Calculate Average Current through LED
Modified application circuit average forward current equation.
Simplified:
9
www.national.com


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