Fairchild FEB157-001 manual Steady State Operation

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4.3 Steady State Operation

Figure 9: Steady State Waveforms at 90Vac with Three LEDs at 1A

Figure 10: Steady State Waveforms at 270Vac with One LED at 350mA

© 2007 Fairchild Semiconductor

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Rev 1.1 April 2007

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Contents FEB157-001 User’s Guide Contents Introduction Product Description Circuit DescriptionOfﬂine LED Driver and LED Assembly Jumper JP1/JP2 Status and LED Current JP1 Status Electrical Requirements Input Requirements Output RequirementsDesigned Solution 3.1 Schematic Transformer Bill of MaterialsRS1M Printed Circuit Board RTH1Silkscreen/Component Placement of Top Side Layer Test Results 4.1 Regulation Line Regulation LED Current vs. Line VoltageEfﬁciency Steady State Operation Steady State Waveforms at 90Vac with Three LEDs at 1AStart up Startup Proﬁle at 90 Vac with Three LEDs at 1AFairchild Semiconductor 526692/7