13

LT1371

Positive-to-Negative Converter with Direct Feedback

Dual Output Flyback Converter with Overvoltage Protection

2 Li-Ion Cells to 5V SEPIC Converter**

Single Li-Ion Cell to 5V

LT1371

GND

4V TO 9V

FB

LT1371 • TA05

S/S

C1

33

µF

20V

C4

0.047

µF

C5

0.0047

µF

R1

2k

R3

6.19k

1%

R2

18.7k

1%

†

5V

C3

100

µF

10V

× 2

ON

OFF

L1A*

10

µH

•

•

L1B*

10

µH

C2

4.7

µF

C1 = AVX TPSD 336M020R0200

C2 = TOKIN 1E475ZY5U-C304

C3 = AVX TPSD107M010R0100

SINGLE INDUCTOR WITH TWO WINDINGS

COILTRONICS CTX10-4

INPUT VOLTAGE MAY BE GREATER OR

LESS THAN OUTPUT VOLTAGE

+

+

MBRS330T3

4V

5V

7V

9V

0.85A

1A

1.3A

1.5A

OUT

*

**

LT1371

2.7V TO 13V

*COILTRONICS CTX10-4

GND

NFB

LT1371 • TA03

S/S

D2

P6KE-15A

D3

1N4148

D1

MBRS330T3

C1

100

µF

C2

0.047

µF

C3

0.0047

µF

R1

2k

R3

2.49k

1%

R2

2.49k

1%

†

–5V

+

C4

100

µF

× 2

+

ON

OFF

3V

5V

9V

0.6A

1.0A

1.5A

2

1

4

T1*

3

•

•

OUT

LT1371

GND

FB

LT1371 • TA06

S/S

L1*

C1**

100

µF

10V

SINGLE

Li-Ion

CELL

C4**

100

µF

10V

× 2

C2

0.047

µF

C3

0.0047

µF

R3

2k

R2

6.19k

1%

R1

18.7k

1%

†

5V

D1

MBRS320T3

ON

OFF

*

**

COILCRAFT DO3316P-103

AVX TPSD107M010R0100

+

+

+

2.7V

3.3V

3.6V

1.2A

1.6A

1.8A

OUT

LT1371

FB

2.7V TO 10V

*DALE LPE-5047-100MB

GND

NFB

LT1371 • TA04

S/S

P6KE-20A

1N4148

MBRS360T3

MBRS360T3

C1

22

µF

R2

6.19k

1%

R1

68.1k

1%

C2

0.047

µF

C3

0.0047

µF

R3

2k

R5

2.49k

1%

R4

12.1k

1%

–15V

15V

+

C4

47

µF

+

C5

47

µF

+

ON

OFF

2, 3

8, 9

7

T1*

4

10

1

•

•

•