LM3402_1 datasheet(5/18 Pages) NSC

부품명	LM3402

상세설명	LM3402/LM3404 Fast Dimming and True Constant LED Current Evaluation Board

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제조업체	NSC [National Semiconductor (TI)]

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Rearranging the above equation and solving for t

OFF with

t

ON set to 510 ns

t

OFF = 938 ns (satisfied)

Example 1 ON & OFF Times

V

IN (V)

V

OUT (V)

t

ON

t

OFF

36

10.4

5.10E-07

9.38E-07

48

10.4

3.82E-07

1.06E-06

60

10.4

3.06E-07

1.14E-06

Calculate Switching Frequency

V

IN = 36V, 48 and 60V.

Substituting equations:

f

SW = 691kHz (VIN = 36V, 48V, & 60V)

Calculate Inductor Value

With 50% ripple at V

IN = 48V

• I

F = 500 mA

• Δi

L = 250 mA (target)

• L = 57 µH (68 µH standard value)

Calculate

Δi for V

IN = 36V, 48V, and 60V with L = 68 µH

Example 1 Ripple Current

V

IN (V)

V

OUT (V)

Δi

L (A)

36

10.4

0.192

48

10.4

0.211

60

10.4

0.223

Calculate R

SNS

Calculate R

SNS at VIN typical (48V), and average LED current

(I

F) set to 500 mA.

30061623

FIGURE 8. Inductor Current Waveform

•

I

F = 500 mA

•

V

IN = 48V

•

V

OUT = 10.4V

•

L = 68 µH

•

t

D = 220 ns

•

t

ON = 382 ns

Using equations from the COT Overview section, calculate

R

SNS.

Therefore: R

SNS = 467 mΩ

Calculate Average LED current (I

F)

Calculate average current through the LEDs for V

IN = 36V and

60V.

Example 1 Average LED Current

V

IN (V)

V

OUT (V)

I

F (A)

36

10.4

0.490

48

10.4

0.500

60

10.4

0.506

5

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LM3402 데이터시트(PDF) 5 Page - National Semiconductor (TI)

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