LM3424_14 datasheet(38/62 Pages) TI1

Part #	LM3424

Description	Constant Current N-Channel Controller with Thermal Foldback for Driving LEDs

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Manufacturer	TI1 [Texas Instruments]

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I

LED =

=

k

0

.

1

1.24V

:

x

A

0

.

1

=

k

4

.

12

1

.

0

:

x

:

R

CSH

SNS x

R

1.24V

HSP

x

300857c9

=

1.24V

=

R

HSP

:

=

k

0

.

1

:

x

:

x

0.1

k

12.4

A

1

x

R

I

SNS

CSH

LED

:

=

1

.

0

1A

R

SNS

I

LED

mV

100

V

SNS

RT = 14.3 k:

kHz

504

1

f

SW

=

e

95

.

1

k

3

.

14

e

40

.

1

8

10

-

:

x

-

e

95

.

1

R

e

40

.

1

8

T

10

-

x

-

f

SW

:

=

k

4

.

14

=

R

T

x

+

-

f

e

95

.

1

SW

8

x

+

-

kHz

500

e

95

.

1

8

x

-

f

e

40

.

1

SW

10

x

-

kHz

500

e

40

.

1

10

DMAX

=

677

.

0

=

V

21

V

10

V

21 +

V

O

V

IN-MIN

O +

21V

=

21V + 70V

= 0.231

DMIN =

VO + VIN-MAX

VO

533

.

0

467

.

0

1

D

1

'

D

=

-

=

-

=

D

=

467

.

0

=

V

21

V

24

V

21 +

V

O

V

IN

O +

:

=

:

x

=

x

=

95

.

1

m

325

6

r

N

r

LED

D

V

21

V

5

.

3

6

V

N

V

LED

O

=

x

=

x

=

LM3424

SNVS603B – AUGUST 2009 – REVISED OCTOBER 2009

www.ti.com

VTURN-ON = 10V

VHYS = 3V

VTURN-OFF = 40V

VHYSO = 10V

TBK = 70°C

TEND= 120°C

tTSU = 30 ms

1. OPERATING POINT

Solve for VO and rD:

(101)

(102)

Solve for D, D', DMAX, and DMIN:

(103)

(104)

(105)

(106)

2. SWITCHING FREQUENCY

Solve for RT:

(107)

The closest standard resistor is 14.3 k

Ω therefore fSW is:

(108)

The chosen component from step 2 is:

(109)

3. AVERAGE LED CURRENT

Solve for RSNS:

(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:

38

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LM3424 Datasheet(PDF) 38 Page - Texas Instruments

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