A8732 datasheet(9/20 Pages) ALLEGRO

部品番号	A8732

部品情報	Ultra Small Mobile Phone Xenon Photoflash Capacitor Charger with IGBT Driver

PDF	20 Pages

Scroll/Zoom	100%

メーカー	ALLEGRO [Allegro MicroSystems]

ホームページ	http://www.allegromicro.com

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Ultra Small Mobile Phone Xenon Photoflash

Capacitor Charger with IGBT Driver

Allegro MicroSystems, Inc.

115 Northeast Cutoff

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

1.508.853.5000; www.allegromicro.com

A8732

320

321

322

323

324

325

326

327

328

1.5

2.0

2.5

3.0

3.5

4.0

4.5

5.0

5.5

Battery Voltage (V)

ILIM15 (0.51A)

ILIM13 (0.65A)

ILIM11 (0.79A)

ILIM9 (0.93A)

ILIM7 (1.07A)

ILIM5 (1.22A)

ILIM3 (1.36A)

ILIM1 (1.50A)

320

321

322

323

324

325

326

327

328

150

200

250

300

350

400

450

500

550

600

650

toff (ns)

5.0

4.2

3.6

2.2

VBAT (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 .

Final Output Voltage versus Battery Voltage at Various ILIM

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

Final Output Voltage versus Secondary Side Conduction Time

at Various Battery Voltages

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

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