uba20260 NXP Semiconductors, uba20260 Datasheet - Page 22

• Manufacturer Part Number: uba20260
• Description: 600 V Driver Ic For Step Dimmable Cfls
• Manufacturer: NXP Semiconductors

NXP Semiconductors
11. Application information
UBA20260
Objective 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
t
ph
en ign
fault oc
ret dim
d restart
bst
t bst burn
•
•
•
•
•
•
•
CP

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

C
o CP
------------------------ -
I

------------- -
I

=
ret dim

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
V
Rev. 1 — 9 September 2011
–


hys CB
hys CP
64


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

+

CP
min
5 V

max
–

–
th CP
ext(RREF)

0.6


600 V driver IC for step dimmable CFLs
max
= 33 k.

UBA20260
© NXP B.V. 2011. All rights reserved.
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