uba20261 NXP Semiconductors, uba20261 Datasheet - Page 23

• Manufacturer Part Number: uba20261
• Description: 600 V And 350 V Power Ic For Step Dimmable Cfls
• Manufacturer: NXP Semiconductors

NXP Semiconductors
11. Application information
UBA20261_UBA20262
Preliminary data sheet
11.1.1 C
11.1.2 C
11.1 Design equations
All described equations are only valid for R
Where I
t
t
t
t
t
t
ph
fault oc
ret dim
d restart
bst
t
t bst burn
•
•
•
•
•
•
•
CP
en ign

CB



=
Preheat time
Ignition enabling time
Overcurrent fault time
Transition to burn time
Retain time step dimming
Restart delay time
Boost time
=

related timing equations
–
related timing equation
------------- -
I

------------- -
I

C
o CP

C
o CB
restart(CP)


=
=

CP
=
CB
=

------------------------ -
I
------------- -
I

------------- -
I

=
ret dim
C
o CP
C
o CP
C




CP
CP
CP
C


------------- -
I

16
C
o CP
CP
126
All information provided in this document is subject to legal disclaimers.




CP
= 0.5 A (typical).


CP


------------------------------------------------------------ -
4


V

V
5 V


th CP
hys CP

V
Rev. 1 — 9 September 2011
–


V
hys CB
64


hys CP
5 V
I
th CP

max
–
restart CP




V
+

ret dim
hys CP

+
min
–
5 V


V
V
–

th rel
th CB




CP
th CP
600 V and 350 V power IC for step dimmable CFLs

+

CP
min
5 V

max
–

–
th CP
ext(RREF)

0.6


max
= 33 k.

UBA20261/2
© NXP B.V. 2011. All rights reserved.
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