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CCFL controller's soft-start profile

Posted: 22 Jan 2009     Print Version  Bookmark and Share

Keywords:DS3994  CCFLs  LCDs 

This application note by Maxim describes the Soft-Start Profile (SSP) used on the DS3994, a 4-channel cold-cathode fluorescent lamp (CCFL) controller, to gradually ramp up the MOSFET duty cycles at the beginning of each lamp burst. The article explains how to customise the device's default SSP values to accommodate the ramping time required in an application.

The DS3994 is a 4-channel controller for CCFLs that backlight LCDs. When burst dimming is used to dim the lamps, the DS3994 uses a soft-start at the beginning of each lamp burst to minimise the audible transformer noise.

View the PDF document for more information.





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