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/Title (NCL30095A - Power Factor Corrected LED Boost Switching Regulator)
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BroadVision, Inc.
2020-09-22T11:08:03+02:00
2017-09-21T10:24:07-07:00
2020-09-22T11:08:03+02:00
application/pdf
NCL30095A - Power Factor Corrected LED Boost Switching Regulator
ON Semiconductor
The NCL30095A high power factor boost PWM switching
regulator is designed to regulate the average current through a string of
LEDs. The circuit operates in Critical Conduction Mode (CrM) based
on a proven constant on−time control scheme to achieve near unity
power factor. In addition to regulating a constant current, the
switching regulator is optimized to support leading and trailing edge
phase dimming applications. When a dimmer is detected on the AC
input, an internal voltage reference of the current regulation loop
adjusts the current level based on the dimmer conduction angle so the
current through the LED string has a desired value based on a
programmed dimming curve. The shape of the dimming curve is
intended to emulate the response of an incandescent bulb while
achieving NEMA SSL6 and NEMA SSL7A recommendations.
An integrated HV MOSFET in a cascoded configuration supports
biasing the controller during operation and eliminates the need for an
auxiliary winding to provide bias power. A robust suite of protection
features is included to ensure proper handling of expected fault
conditions without the need for extra circuitry and a dedicated thermal
fold−back input proves gradually reduction of the current above a user
defined set−point.
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