Fairchild FEB157-001 manual Start up, Startup Proﬁle at 90 Vac with Three LEDs at 1A

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4.4 Start up

The startup proﬁle is captured at 90Vac and 270Vac with a load of three LEDs operating at a current of 1A.

Figure 11: Startup Proﬁle at 90 Vac with Three LEDs at 1A

Figure 12: Startup Proﬁle at 270Vac with Three LEDs at 1A

© 2007 Fairchild Semiconductor

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Rev 1.1 April 2007

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Contents FEB157-001 User’s Guide Contents Circuit Description Introduction Product DescriptionOfﬂine LED Driver and LED Assembly Jumper JP1/JP2 Status and LED Current JP1 Status Output Requirements Electrical Requirements Input RequirementsDesigned Solution 3.1 Schematic Bill of Materials TransformerRS1M RTH1 Printed Circuit BoardSilkscreen/Component Placement of Top Side Layer LED Current vs. Line Voltage Test Results 4.1 Regulation Line RegulationEfﬁciency Steady State Waveforms at 90Vac with Three LEDs at 1A Steady State OperationStartup Proﬁle at 90 Vac with Three LEDs at 1A Start upFairchild Semiconductor 526692/7