AN10958_15 Datasheet, PDF (23/56 Pages) NXP Semiconductors – Fluorescent lamp driver with PFC using the UBA2015/16 family

NXP Semiconductors
AN10958
Fluorescent lamp driver with PFC using the UBA2015/16 family
V_BUS
Cres
Lres
R13//R14
Rbias
Cdc
C7
R10
VFB
C8
D8
R11
C31
3.35 V
2.5 V
80 mV
2.6 μA
HALF-BRIDGE
CONTROLLER
UBA2016A
Fig 18. Typical VFB pin circuit for series resonant topologies
019aaa635
3.4.5.2 Inductive heating VFB circuit
In indicative heating topologies, the VFB circuit (with two LC tanks) shown in Figure 19
can be used. The resonance capacitors sense the lamp voltage and no additional HV
capacitor is needed. The capacitor C2 in Figure 19 divides the lamp voltage to a lower
level. R2 and R3 divided it to a lower level and provide an RC filter with capacitor C3.
Cs
Lr1b
Cdc
Lr1a
Cr1
Lr2a
Cs
Lr2b
Cr2
Lr1c
Lr2c
Cs
R1
R2
C2
D1
Cs
VFB
UBA2015/6
R3
C3
aaa-001847
Fig 19. Typical VFB pin application for a topology with two LC tanks and lamp to ground
configuration
AN10958
Application note
All information provided in this document is subject to legal disclaimers.
Rev. 2 — 9 August 2012
© NXP B.V. 2012. All rights reserved.
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