MB3889 데이터 시트보기 (PDF) - Fujitsu

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MB3889

2-Channel DC/DC Converter IC with Overcurrent Protection Symmetrical-Phase Type

Fujitsu 

MB3889

Triangular Wave Oscillation Frequency

vs. Power Supply Voltage

330

325

320

315

310

305

300

295

290

285

280

275

270

0

Ta = +25 °C

RT = 47 kΩ

CTL = 5 V

5

10

15

20

Power supply voltage VCC (V)

Triangular Wave Oscillation Frequency

vs. Ambient Temperature

2

VCC = 12 V

1.5

RT = 47 kΩ

CTL = 5 V

1

0.5

0

−0.5

−1

−1.5

−2

−40 −20 0

20 40 60 80 100

Ambient temperature Ta ( °C)

Error Amplifier Threshold Voltage

vs. Ambient Temperature

1.244

1.242

1.240

1.238

1.236

1.234

1.232

1.230

1.228

1.226

1.224

1.222

1.220

1.218

−40

VCC = 12 V

CTL = 5 V

−20 0

20 40 60 80 100

Ambient temperature Ta ( °C)

Error Amplifier, Gain, Phase

vs. Frequency

40

Ta = +25 °C 180

30

AV

ϕ

20

90

10 kΩ

10

1 µF 10 kΩ

+

0

0

IN

2.4 kΩ

−10

−20

−90

−30

10 kΩ 10 kΩ

−40

−180

4.2 V VCC = 12 V

240 kΩ

(15)

1−

3+

(13) +

2

(14) OUT

Error Amp1

(Error Amp2)

1.23 V

100 1 k 10 k 100 k 1 M 10 M

Frequency f (Hz)

12

(Continued)

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