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AN2982 Datasheet(PDF) 2 Page - STMicroelectronics

Part # AN2982
Description  This application note describes the STEVAL-ILB005V2 demonstration board equipped with the L6585DE lighting controller
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2982 Datasheet(HTML) 2 Page - STMicroelectronics

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Contents
AN2982
2/31
Doc ID 15599 Rev 1
Contents
1
Designing the application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.1
Design requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.2
PFC design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.2.1
Output voltage and dynamic OVP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.2.2
Boost choke design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.2.3
MOSFET selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.2.4
Boost diode selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
1.2.5
Bulk capacitor selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
1.2.6
Multiplier biasing and selection of PFC current sense resistor . . . . . . . 10
1.2.7
Error amplifier compensation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
1.2.8
Input rectifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
1.2.9
Input capacitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
1.2.10
Input circuitry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
2
Ballast stage design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
2.1
Resonant network and operating point design . . . . . . . . . . . . . . . . . . . . . 15
2.2
Selection of parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
2.3
Half-bridge design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
2.4
End of life detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
2.5
IC power supply design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
3
Demonstration board schematic and bill of material . . . . . . . . . . . . . . 23
3.1
Demonstration board performances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
3.2
Ballast stage performance and reliability . . . . . . . . . . . . . . . . . . . . . . . . . 27
4
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30


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