LTC3705

17

3705fb

TYPICAL APPLICATIO S

NDRV

GND

PGND VSLMT

UVLO

BOOST

LTC3705

BAS21

FQT7N10

0.22

µF

2.2nF

250V

1nF

100V

1nF

100V

10

µF

25V

CMPSH1-4

1.2

Ω

L2 1.2

µH

10

Ω

0.25W

10

Ω

0.25W

TG TS BG IS

T2

1

µF

162k

L1: VISHAY IHLP-2525CZ-01

L2: COILCRAFT SER2010-122

T1: PULSE PA0807

T2: PULSE PA0297

33nF

30m

Ω

1W

2m

Ω

2W

Si7336ADP

Si7336ADP

×2

T1

2:1

9:2

•

•

MURS120

MURS120

33nF

1nF

15k

1%

365k

1%

100k

2.2

µF

25V

SS/FLT

–

+

L1 1

µH

330

µF

6.3V

×3

1

µF

2.2

µF

16V

470pF

680pF

FG SW

SG

NDRV

CZT3019

GND PGND PHASE SLP MODE REGSD

+

–

RUN/SS

LTC3706

ITH

22.6k

1%

100k

20k

680pF

102k

1%

–

3705 F06

+

FB

FS/SYNC

0.1

µF

5k

1nF

•

•

1

µF

100V

1

µF

100V

x3

100

Ω

100

Ω

100

Ω

100

Ω

Si7852DP

Si7852DP

Figure 6. 36V-72V to 3.3V/20A Isolated Forward Converter Using LTC3706

LOAD CURRENT (A)

0

85

90

95

20

15

3705 F06c

510

25

80

20

µs/DIV

LOAD STEP = 0A TO 20A

50mV/DIV

10A/DIV

3705 F06b

Efficiency

Load Step