A multimode digital controller IC for flyback converter with high accuracy primary-side feedback

A digital controller IC for the flyback converter with primary-side feedback is proposed. The controller is used for adapter charger or LED driver applications. To obtain high accuracy for the primary-side feedback, a digital primary-side sensing technology is adopted, which can auto-track the knee...

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Bibliographic Details
Published in:Frontiers of information technology & electronic engineering 2013-08, Vol.14 (8), p.652-662
Main Authors: Qiu, Jian-ping, He, Le-nian, Wang, Yu-lin
Format: Article
Language:English
Subjects:
Communications Engineering
Compensators
Computer Hardware
Computer Science
Computer Systems Organization and Communication Networks
Control systems
Control theory
Controllers
Digital
Electric potential
Electrical Engineering
Electronics and Microelectronics
Feedback
Instrumentation
Integrated circuits
Networks
Pulse duration modulation
Pulse frequency modulation
Voltage
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Summary:A digital controller IC for the flyback converter with primary-side feedback is proposed. The controller is used for adapter charger or LED driver applications. To obtain high accuracy for the primary-side feedback, a digital primary-side sensing technology is adopted, which can auto-track the knee point of the primary auxiliary winding voltage. Furthermore, an internal digital compensator eliminates the need for external loop compensation components while achieving excellent line and load regulation. The controller could output both constant voltage and constant current depending on the load current. Pulse width modulation and pulse frequency modulation are used in constant voltage mode while quasi-resonant control is used in constant current mode. The digital controller is validated by using FPGA.
ISSN:1869-1951
2095-9184
1869-196X
2095-9230
DOI:10.1631/jzus.C1200344