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MB39C602 Datasheet(PDF) 14 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) 14 Page - Cypress Semiconductor

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Document Number: 002-08397 Rev. *A
Page 14 of 40
MB39C602
6. OTC Part
It is set on-time by connecting resistance (ROTC) with OTC pin.
As shown in following figure, the on-time can be controlled by connecting the collector of the Opto-Coupler through
resistor from OTC.
OTC pin Control
The following figure shows how the on-time is programmed over the range of between 1.5
μs and 5.0 μs for either range of
programming resistors. On-time is related to the programmed resistor based on the following equations.
ROTC = tOTC × (2 × 10
10
[
Ω
] )
S
On-time Setting Range
ROTC - Constant On-Time Resistance [kΩ]
Moreover, it can be shutted down by making the voltage of the OTC pin below "VOTC (Vth) (typ 1V)".
On-Time Modulation
Fault Timing
and Control
Fault
VGATE
OTC
ROTC
4
3V
IOTC
1V
Shutdown
and Restart
Thermal
Shutdown
UVLO
Fault Latch
Reset


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