14

LTC1422

Figure 15. Switching 48V to a Vicor Module with Isolated Controller

1

2

3

4

8

7

6

5

SENSE

GATE

FB

VICOR

VI-J30-CY

5V

GND

µP

PWRGD

RESET

ON

++

__

GATE IN

C3

100

µF

100V

RESET

ON

TIMER

GND

LTC1422

Q1

IRF530

OPTIONAL

PRECHARGE RESISTOR

1422 F15

1

2

3

4

8

7

6

5

SENSE

GATE

FB

RESET

ON

TIMER

GND

LTC1422

Q4

5V

C1

0.1

µF

25V

CIRCUIT FOR ACTIVE HIGH TURN-ON MODULES

D1

7.5V

1N755A

C4

1

µF

25V

R6

1M

5%

R7

270k

5%

C2

0.1

µF

25V

R5

6.2k

5%

R4

5.1k

5%

R1

36k

5%

R2

1.2k

5%

R3

10

Ω

5%

R8

510

Ω

5%

48V

+

–

4N25

4N25

R11

5.1k

5%

R12

5.1k

5%

C5

0.33

µF

16V

R10

10

Ω

5%

R9

0.5

Ω

5%

C6

0.022

µF

16V

R13

28k

1%

R14

10k

1%

C7

47

µF

16V

FUSE

+

+

Figure 14. Hop Swapping Redundant 48V Supplies

1

2

3

4

8

7

6

5

SENSE

GATE

FB

VICOR

VI-J30-CY

5V

++

__

GATE IN

C3

100

µF

100V

RESET

ON

TIMER

GND

LTC1422

Q1

IRF530

OPTIONAL

PRECHARGE RESISTOR

1422 F14

C1

0.33

µF

16V

FAULT GOES LOW WHEN EITHER SUPPLY FAILS

D1

7.5V

1N755A

C4

1

µF

25V

C2

0.1

µF

25V

R5

10k

5%

R1

36k

5%

R7

10k

5%

R10

5.1k

5%

R9

1k

5%

R2

1.2k

5%

R3

10

Ω

5%

Q2

MPSA56

R8

510

Ω

5%

R4

10k

5%

FAULT

D2

MUR415

D4

1N4148

COMMON

RETURN

D5

1N4148

4N25

D3

MUR415

FUSE 2

FUSE 1

– 48V

– 48V

R6

10k

5%

+