LT3724

21

3724fc

TYPICAL APPLICATIONS

High Voltage LED Driver with Dimmer Control

4.5V to 20V Input to 12V at 25W Output SEPIC Converter with 60V Input Transient Capability

Efficiency and Power Loss

vs Load Current

4

SHDN

BURST_EN

SGND

BOOST

TG

SW

PGND

M1

ZXMN10A07F

M2

2N7002

OPTIONAL

DIMMER

CONTROL

1kHz

3724 TA03

LT3724

1

3

5

6

7

8

16

15

14

12

11

10

9

1μF

16V

C1

100pF

R1

4.7M

0.5Ω

L1

300μH

LED

8V TO 60V

C1 = OPTIONAL TO REDUCE LED RIPPLE CURRENT

D1 = DIODESINC., B170

M1 = ZETEX, ZXMN10A07F

L1 = COILTRONICS, CTX300-4

0.15V

C1

(OPTIONAL)

D1

B170

4

RB

49.9k

RA

100k

R5

40.2k

0.010Ω

R2

130k

R1

14.7k

SHDN

R3

200k

BURST_EN

SGND

TG

SW

PGND

1

3

5

6

7

8

16

15

14

12

11

10

9

C3

680pF

C2

120pF

R4

47k

C7

0.1μF

C1

390pF

25V

1μF

22μF

2x

25V

4.5V TO 20V

TO 60V

TRANSIENT

D1A

GSD2004

D3

D1N4148

L1

20μH

L1

20μH

D1B

GSD2004

D2

12V AT 25W

22μF

M1

3724 TA07a

BOOST

LT3724

C4

1μF

25V

330μF

25V

16V

C6

56pF

R7

10Ω

R6

10Ω

C5

22μF

3x

25V

•

•

D2 = ON SEMI, MBRD660

L1 = COILCRAFT VERSAPAC VP5-D83

M1 = VISHAY, Si7852DP

LOAD CURRENT (A)

0.1

92

91

90

89

88

87

86

85

3.5

3.0

2.5

2.0

1.5

1.0

0

0.5

110

3724 TA07b

LOSS