M5291FP 데이터 시트보기 (PDF) - Renesas Electronics

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M5291FP

DC / DC Converter

Renesas Electronics 

M5291P/FP

5. Inverse Polarity Circuit

VIN = 5 V

VOUT = −5 V

IO = 40 mA

f = 50 kHz

1

L

2

260 µH

3

CT

820 pF

D

4

VOUT

−5 V/40 mA

+

COUT

100 µF

8

QS

R

7

Oscillator

Comparator

6

1.17 V

+

−

5

R1

1 kΩ

RSC

1.5 Ω

+

VIN

5V

CIN

100 µF

R2

3.3 kΩ

6. Inverse Polarity Circuit with Transistor

VIN = 5 V

VOUT = −12 V

IO = 1 A

f = 50 kHz

PNP

Tr

R3

100 Ω

1

R4

24 Ω

L 20 µH

2

3

CT

820 pF

D

4

VOUT

−12 V/1 A

+ COUT

220 µF

QS

R

Oscillator

1.17 V

Comparator

+

−

8

7

RSC

0.1 Ω

6

+

VIN

5V

CIN

100 µF

5

R1

2.4 kΩ

R2

22 kΩ

REJ03D0841-0300 Rev.3.00 Jun 15, 2007

Page 6 of 9

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