uba20271 NXP Semiconductors, uba20271 Datasheet - Page 24

• Manufacturer Part Number: uba20271
• Description: 350 V And 600 V Power Ics For Dimmable Compact Fluorescent Lamps
• Manufacturer: NXP Semiconductors

NXP Semiconductors
11. Application information
UBA20271_UBA20272
Product data sheet
11.1.1 C
11.1.2 C
11.1.3 C
11.1 Design equations
All equations are only valid for R
Where: I
t
t
t
t
t
t
ph
en ign
fault oc
d restart
bst
t bst burn
•
•
•
•
•
•
•
•
CP
CB
CF

f

bridge max

=
Preheat time:
Ignition enabling time:
Overcurrent fault time:
Transition to burn time:
Restart delay time
Boost time:
Maximum bridge frequency:
Minimum bridge frequency with disabled boost:
=

related timing equations:
related frequency equations:
related timing equations:
–

------------- -
I
------------- -
I
C
o CP

C
o CB
=



restart(CP)

CP
=
CB
=
------------- -
I

C
o CP

------------- -
I



=
C
o CP
------------------------- -
I

CP

restart CP

=
CP

------------- -
I


16
C
C
o CP
126
All information provided in this document is subject to legal disclaimers.
--------------------------------------------------------------------------- -
C
---------------------------
350 V and 600 V Power ICs for dimmable compact fluorescent lamps



CP
I
CP

= 0.5 A (typical)
CF
o CF

4





V

5 V
+

hys CP
V
V

Rev. 2 — 8 September 2011
max
–
C


hys CB
hys CP
64

par

th CP
V




th CP


V
+



0.5
V
hys CP
+
min
5 V
th CF
V
max
–


ext(RREF)
th CB


th CP
max

–
+

V
min
5 V
th rel
+
max
–

= 33 k
t
–
dch
th CP

0.6
CP



max

UBA20271/2
© NXP B.V. 2011. All rights reserved.
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