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/Author (ON Semiconductor)
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/Title (EVBUM2039DB - 35-50 Volt, Up to 1.5 Amp, Offline Power Factor Corrected LED Driver with Flexible Dimming Options Evaluation Board User's Manual)
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ON Semiconductor
EVBUM2039DB - 35-50 Volt, Up to 1.5 Amp, Offline Power Factor Corrected LED Driver with Flexible Dimming Options Evaluation Board User's Manual
This application note describes a 60 W, off−line, power
factor corrected, line isolated, LED driver using
ON Semiconductor’s new NCL30051 two−stage controller.
This controller contains the control circuitry for both a
critical conduction mode (CRM) boost power factor
corrector (PFC), and a fixed frequency, series resonant
half−bridge converter, and is housed in a 16 pin SOIC
package. The high level of integration and low pin count is
based on a novel control topology where the PFC output
bulk voltage is adjusted via closed loop to change the
amount of power transferred by the fixed duty cycle
half−bridge. The resonant half−bridge essentially functions
as a dc−to−dc step−down transformer. This approach is
simpler to implement and stabilize compared to the more
complex LCC topology where the frequency of the resonant
controller is varied to change the amount of power
transferred to the load. The fixed frequency and symmetrical
duty cycle of the resonant half−bridge clocking allows for
very simple transformer design. This topology is capable of
powering series LED loads with efficiencies reaching 90%.
This is mainly due to the CRM power factor corrector and
the very high efficiency of the resonant half−bridge which
results in zero current and voltage switching in the power
MOSFETs. Such efficiencies would be quite difficult using
a conventional flyback converter in the second stage.
Constant voltage, constant current control (CVCC) is
handled on the secondary side of the power circuit using
ON Semiconductor’s NCS1002 CVCC controller with
integrated reference. Although this particular design
represents a 60 W nominal application, the controller
topology is ideal for power levels to 200 W and higher. This
specific design is available as evaluation board
NCL30051LEDGEVB.
There are a wide variety of medium power lighting
applications that would benefit from replacing the
traditional light source with an LED source including street
lights, refrigerator cases, parking garag
2019-10-29T11:37:28+08:00
BroadVision, Inc.
2019-10-29T11:38:40+08:00
2019-10-29T11:38:40+08:00
Acrobat Distiller 19.0 (Windows)
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