BD9851EFV datasheet(6/17 Pages) ROHM

Part #	BD9851EFV

Description	Single-output High-frequency Step-down Switching Regulator(Controller type)

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Manufacturer	ROHM [Rohm]

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Fig.7 Error Amp threshold voltage vs. Ambient temperature

1.02

1.015

1.01

1.005

1

0.995

0.99

0.985

0.98

–40

–20

0

20

40

60

80

–40

–20

0

20

40

60

80

1000

900

800

700

600

500

400

300

200

100

0

0.5

1

1.5

2

2.5

3

3.5

4

Vcc=20V

Vcc=12V

Vcc=4V

2.55

2.54

2.53

2.52

2.51

2.5

2.49

2.48

2.47

2.46

2.45

320

315

310

305

300

295

290

285

280

Fig.8 FB voltage vs. ON Duty

Fig.10 Output voltage vs. Output sink current

Fig.12 Oscillation frequency vs. Ambient temperature

–40

–20

0

20

40

60

80

1000

900

800

700

600

500

400

300

200

100

0

0.5

0

1.5

2

2.5

3

3.5

4

Vcc=20V

fosc=1MHz

fosc=300kHz

Vcc=12V

Vcc=4V

100

90

80

70

60

50

40

30

20

10

0

1.2

1.3

1.4

1.5

1.6

1.7

1.8

19

AMBIENT TEMPERATURE : Ta(˚C)

(Vcc-OUT) VOLTAGE : VO(V)

AMBIENT TEMPERATURE : Ta(˚C)

OUT VOLTAGE : VO (V)

DTC VOLTAGE : VDTC (V)

Fig.9 (Vcc-OUT) Voltage vs. Output source current

Fig.11 VREF vs. Ambient temperature

RRT=24kΩ

CCT=220pF

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