A8732 Просмотр технического описания (PDF) - Allegro MicroSystems

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A8732

Ultra Small Mobile Phone Xenon Photoflash Capacitor Charger with IGBT Driver

Allegro MicroSystems 

A8732

Ultra Small Mobile Phone Xenon Photoflash

Capacitor Charger with IGBT Driver

Final Output Voltage versus Battery Voltage at Various ILIM

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

328

327

326

325

324

323

322

321

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

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 .

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

328

327

326

VBAT (V)

5.0

325

4.2

324

3.6

323

2.2

322

321

320

150 200 250 300 350 400 450 500 550 600 650

toff (ns)

Allegro MicroSystems, Inc.

9

115 Northeast Cutoff

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

1.508.853.5000; www.allegromicro.com

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