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MB39C602 Datasheet(PDF) 17 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) 17 Page - Cypress Semiconductor

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Document Number: 002-08397 Rev. *A
Page 17 of 40
MB39C602
9. ZCD Part
MB39C602 requires the following two conditions in order to start the next switching cycle.
(1)
The time since the last turn-on edge must be equal to or longer than the switching time set by IFC.
(2)
Immediately after zero current detection at ZCD pin. Or, the time since the last zero current detection must be longer
than tWAIT (ZCD) (2.4 μs or less).
The ZCD pin is connected with Auxiliary Winding of the transformer through the resistance division, and detects zero
current as shown below.
A delay, 50 ns to 200 ns, can be added with CZCD to adjust the turn-on of the primary switch with the resonant bottom of
Primarty Winding waveform.
Switching Waveform at detecting zero current
ZCD pin Connection
CZCD
1
ZCD
2
RZCD2
RZCD1
NB
NP
NS
5V
OV
Fault
20mV
Zero Current
Detect
Fault Timing
and Control


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