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MP3356DG Datasheet(PDF) 8 Page - Monolithic Power Systems |
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MP3356DG Datasheet(HTML) 8 Page - Monolithic Power Systems |
8 / 10 page MP3356 – HIGH VOLTAGE PHOTO FLASH CHARGER AND IGBT DRIVER FOR DSC MP3356 Rev. 0.91 www.MonolithicPower.com 8 1/29/2010 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2010 MPS. All Rights Reserved. OPERATION The MP3356 controlled flyback charger operates in critical conduction mode with 1.5A peak current. The output voltage is divided down through an internal 300: 1 resistive divider from the positive terminal of the transformer secondary (FB pin) and compares it with an internal 1.2V reference. The low to high transition of the EN pin will enable the flyback converter to switch. A constant TOFF of 20µs is used when the output voltage is below 20V to avoid inrush current. The boundary mode operation will follow to minimize charge time when the output voltage is above 20V. A minimum TOFF of 200ns serves as blanking for turn off transition. The circuit will stop switching and PG will be pulled low once the flash capacitor is charged to 300V. This value is set by the internal 300:1 R divider and the 1.2V reference. When charge is complete, the part will shut down its internal circuitry and draw less than 100uA drawn from Vin. The EN pin will restart the charge. Bringing the EN pin low terminates the power delivery and puts the part in shutdown. A maximum TON timer prevents pulling current from a depleted battery. If the ON time exceeds the maximum TON, the switch is forced OFF regardless of IPEAK detection. |
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