A8439EEJTR-T 데이터 시트보기 (PDF) - Allegro MicroSystems

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A8439EEJTR-T

Photoflash Capacitor Charger with IGBT Driver and Refresh

Allegro MicroSystems 

A8439

Photoflash Capacitor Charger with IGBT Driver and Refresh

Figure 7 shows the last charging cycle, when the CHARGE pin is

forced low before charging has been completed.

The A8439 implements an adaptive off-time, tOFF , control.

After the switch is turned off, a sensing circuit tracks the flyback

voltage at the SW node. As soon as this voltage swings below

1.2 V, the switch is turned on again for the next charging cycle.

However, when the photoflash capacitor charger circuit starts

up at low output voltage, a timeout may be triggered to limit the

maximum switch off-time to 20 μs.

Figure 7. Last charging cycle, when the CHARGE pin is forced low before

charging is complete.

Allegro MicroSystems, Inc.

11

115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036 (508) 853-5000

www.allegromicro.com

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