LT1952 데이터 시트보기 (PDF) - Linear Technology

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LT1952

Single Switch Synchronous Forward Controller

Linear Technology 

APPLICATIONS INFORMATION

98

96

94

92

90

88

VIN = 48V

VOUT = 5V

86

fOSC = 300kHz

0

5

10

15

20

25

LOAD CURRENT (A)

1952 F12

Figure 12. LT1952-Based Synchronous Forward Converter

Efficiency vs Load Current (For Circuit in Figure 14)

LT1952/LT1952-1

IOUT

(5A/DIV)

0A

VOUT

(200mV/DIV)

20µs/DIV

1952 F13

Figure 13. Output Voltage Transient Response

(6A to 12A Load Step at 6A/µs)

100k

0.1µF

SOUT 16 SOUT

7

SD_VSEC

5

14

SS_MAXDC

OUT

11

22k

OC

6

10

VREF

ISENSE

2

FB

13

LT1952-1 PGND

0.1µF

8

GND

3

15

ROSC

VIN

115k

4

SYNC

1

COMP

BLANK DELAY

9

12

40k 33k 1µF

Q1: PHM15NQ20 PHILIPS

10VBIAS

0.1µF

+VIN

36V TO 72V

475k

CIN

2.2µF

100V

X5R

T1

PA0491

Q2

Q1

PH3830

L1

PA1393.152

Q3

PH3830

+V0UT

5V

20A

C01

100µF

X5R

2×

1k

18.2k

10VBIAS

9.53k

4.75k

SOUT

T2

220pF

HCPL-M453

6

1

5

2

4

3

0.015Ω

SYNC

560Ω

7VBIAS

1µF

X5R

R13

270Ω

C9, 6.8nF

R14

1.2k

+V0UT

R15

38.3k

LTC1698

1

16

VDD

FG

2 CG

SYNC 15 SYNC

3

PGND

4 GND

5

OPTO

6

VCOMP

14

VAUX

13

ICOMP

12

+ISNS

11

–ISNS

0.1µF

8

VFB

9

OVP

R16

12.4k

1952 F14

Figure 14. 36V to 72V Input to 5V at 20A Synchronous Forward Converter

19521fe

21

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