MB3886 데이터 시트보기 (PDF) - Fujitsu

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MB3886

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

Fujitsu 

MB3886

(Continued)

Triangular Waveform Oscillation Frequency

vs.

Supply Voltage

320

315

Ta = +25 °C

310

RT = 9.1 kΩ

305

CT = 330 pF

300

295

290

285

280

275

270

265

260

0

5

10

15

20

Supply voltage VCC (V)

Error Amp. Gain/Phase vs. Frequency (CH1)

Ta = +25 °C

40

180

30

Av

20

ϕ

90

10

0

0

−10

−20

−90

−30

−40

−180

100 1 k 10 k 100 k 1 M 10 M

Frequency f (Hz)

Triangular Waveform Oscillation Frequency

vs.

Ambient Temperature

2

VCC = 12 V

1.5

RT = 9.1 kΩ

CT = 330 pF

1

0.5

0

−0.5

−1

−1.5

−2

−40 −20 0

20 40 60 80 100

Ambient Temperature Ta ( °C)

VCC = 12 V

4.7 kΩ

+ 2.4 kΩ (23)

IN

8

10 µF

7

4.7 kΩ

(24)

240 kΩ

−

+

+

9

(22) OUT

Error Amp.1

(Error Amp.2)

Error Amp. Threshold Voltage

vs.

Ambient Temperature (CH1)

1.264

1.262

1.26

1.258

1.256

1.254

1.252

1.25

1.248

1.246

1.244

1.242

1.24

1.238

1.236

−40 −20 0

VCC = 12 V

20 40 60 80 100

Ambient Temperature Ta ( °C)

Power Dissipation vs. Ambient Temperature

800

770

700

600

500

400

300

200

100

0

−40 −20 0

20 40 60 80 100

Ambient Temperature Ta ( °C)

11

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