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A8735

Ultra Small Mobile Phone Xenon Photoflash Capacitor Charger with IGBT Driver

Allegro MicroSystems 

A8735

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

1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5

Battery Voltage (V)

Note: Output voltage is sensed from the primary side winding when the switch turns off. This duration, toff , has

to be long enough (>200 ns) in order to obtain an accurate measurement. The value of toff depends on ISWlim,

primary inductance, LPrimary , and the turns ratio, N, as given by: toff = (ISWlim × LPRIMARY × N) / VOUT .

Average Input Current versus Battery Voltage

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

0.50

0.45

0.40

0.35

0.30

0.25

0.20

1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5

Battery Voltage (V)

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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