A8740 데이터 시트보기 (PDF) - Allegro MicroSystems

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A8740

Ultra Small Mobile Phone Xenon Photoflash Capacitor Charger with IGBT Driver

Allegro MicroSystems 

A8740

Ultra Small Mobile Phone Xenon Photoflash

Capacitor Charger with IGBT Driver

Final Output Voltage versus Battery Voltage

Transformer LPRIMARY = 12.8 μH, N =10.25, VIN =3.6 V, at room temperature

328

327

326

325

324

323

322

321

320

319

318

1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5

Battery Voltage (V)

Average Input Current versus Battery Voltage

Transformer LPRIMARY = 12.8 μH, N =10.25, VIN =3.6 V, at room temperature

0.8

0.7

0.6

0.5

0.4

0.3

0.2

0.1

0

1.5

2.0

2.5

3.0

3.5

4.0

4.5

5.0

5.5

Battery Voltage (V)

Note: Peak switch current is limited by the maximum on-time and di/dt of the transformer

primary current; therefore, average input current drops at very low battery voltage.

Allegro MicroSystems, Inc.

8

115 Northeast Cutoff

Worcester, Massachusetts 01615-0036 U.S.A.

1.508.853.5000; www.allegromicro.com

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