UM10564

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© NXP B.V. 2012. All rights reserved.

User manual

Rev. 1 — 20 August 2012

6 of 21

NXP Semiconductors

UM10564

UBA2017DB1064 2 x 28 W T5 demo board

5.2.1 Improved valley fill function

the lamp voltage signal improve the valley fill function. Both electrolytic capacitors have a

rating of 250 V. Do not exceed the maximum rating of the electrolytic capacitors. Channel

schematic when the lamp does not ignite.

Fig 5.

Principle ballast schematic

lamp current sense

Half-bridge current sense

-

+

Rsl

Dvf3

Cfil

Lfil

Cpump2

Cfil

Dcic2

Lr2A

Lr1A

Ccic

Lamp1

Cpump1

Lamp2

Cfil

Cvf1

Cr1

Cfil

Cr2

Cdc

Cbus

Rs

Dvf2

Dvf1

Lr2C

LIN

Lfil

Lr1C

Cvf2

Lr2B

Q2

Lcic

Lfil

Q1

CIN

Dcic1

-+

Dbridge

Lr1B

Lfil

Dvf4

VIN

aaa-003976