Low Cost Alternative to LEDs for Backlighting


Posted on Mar 26, 2013

The circuit shown in Figure 1 is specifically designed to control a single 1W CCFL. T1, Q1, Q2 and associated components form a current fed resonant Royer converter that produces a high voltage at transformer T1s secondary winding. The CCFL current is the feedback signal to the LTC®1697. The LTC1697 delivers switch mode power to the L1-internal synchronous diode node closing a control loop around the Royer converter. R3 sets the lamp current operating point. The loop stabilizes the lamp current against variations in time, supply, temperature and lamp characteristics.






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