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MB39C602 Datasheet(PDF) 18 Page - Cypress Semiconductor

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

MB39C602 Datasheet(HTML) 18 Page - Cypress Semiconductor

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Document Number: 002-08397 Rev. *A
Page 18 of 40
MB39C602
9. Various Protection Circuits
Under voltage lockout protection (UVLO)
The under voltage lockout protection (UVLO) protects IC from malfunction and protects the system from destruction/deterioration
during the transient state and momentary drop due to start up for the power supply pin voltage (VDD). The voltage decrease of
the VDD pin is detected with comparator, and output HS DRIVER is turned off and output DRIVER is turned off, and the switching
is stopped. The system returns if the VDD pin becomes more than the threshold voltage of the UVLO circuit.
Output over voltage Proteciton (OVP)
When LED is in the state of open and the output voltage rises too much, the voltage of Auxiliary Winding and the voltage of the
ZCD pin rise. The over voltage is detected by sampling this voltage of the ZCD pin.
When ZCD pin voltage rises more than the threshold voltage of OVP, the over voltage is detected. Output HS DRIVER is turned
off, and output DRIVER is turned off, and the switching is stopped. (latch-off)
If the VDD pin becomes below the voltage of Fault Latch Reset, OVP is released.
Over temperature protection (OTP)
The over temperature protection (OTP) is a function to protect IC from the thermal destruction. When the junction temperature
reaches +150°C, output HS DRIVER is turn off, and output DRIVER is turned off, and the switching is stopped. It returns again
when the junction temperature falls to +125°C (automatic recovery).


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