MB39C601 Datasheet, PDF (14/37 Pages) Cypress Semiconductor – High power factor in single conversion

Power-Up Sequencing
UVLO threshold
UVLO threshold
MB39C601
8.5 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 MB39C601 becomes shutdown when the
voltage at the VDD pin falls below the threshold voltage of UVLO.
Power Down Sequencing
UVLO threshold 8V
Document Number: 002-08393 Rev.*A
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