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MB39C602 Datasheet(PDF) 13 Page - Cypress Semiconductor

Part No. MB39C602
Description  High Power Factor LED Driver IC for LED Lighting
Download  40 Pages
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Maker  CYPRESS [Cypress Semiconductor]
Homepage  http://www.cypress.com
Logo CYPRESS - Cypress Semiconductor

MB39C602 Datasheet(HTML) 13 Page - Cypress Semiconductor

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Document Number: 002-08397 Rev. *A
Page 13 of 40
MB39C602
Power-Up Sequencing
5. Power Down Sequencing
When AC power is removed from the AC line, the current does not flow to Secondary Winding even if HV MOSFET is switching.
The LED current is supplied from the output capacitance and decreases gradually. Similarly, the voltage at the VDD pin
decreases because the current does not flow into Auxiliary Winding. The switching stops and MB39C602 becomes shutdown
when the voltage at the VDD pin falls below the threshold voltage of UVLO.
Power Down Sequencing
UVLO threshold
UVLO threshold
UVLO threshold 8V


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