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UBA20260T/1,518

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30
UBA20260 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2011. All rights reserved.
Product data sheet Rev. 2 — 10 October 2011 22 of 30
NXP Semiconductors
UBA20260
600 V driver IC for step dimmable CFLs
11. Application information
11.1 Design equations
All described equations are only valid for R
ext(RREF)
= 33 k.
11.1.1 C
CP
related timing equations
• Preheat time
(1)
• Ignition enabling time
(2)
• Overcurrent fault time
(3)
• Transition to burn time
(4)
• Retain time step dimming
(5)
• Restart delay time
(6)
Where I
restart(CP)
=0.5A (typical).
11.1.2 C
CB
related timing equation
• Boost time
(7)
t
ph
C
CP
I
oCP
--------------
16 V
hys CP
5V
th CPmax
–+=
t
en ign
C
CP
I
oCP
--------------
4V
hys CP
=
t
fault oc
C
CP
I
oCP
--------------
5V
th CPmin
–=
t
t bst burn–
C
CP
I
oCP
--------------
64 V
hys CP
5V
th CPmax
–+=
t
ret dim
C
CP
I
ret dimCP
-------------------------
5V
ret dimCP
–=
t
drestart
C
CP
V
th CPmax
V
th relCP
–
I
restart CP
-------------------------------------------------------------
=
t
bst
C
CB
I
oCB
--------------
126 V
hys CB
V
th CBmin
0.6–+=
UBA20260 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2011. All rights reserved.
Product data sheet Rev. 2 — 10 October 2011 23 of 30
NXP Semiconductors
UBA20260
600 V driver IC for step dimmable CFLs
11.1.3 C
CF
related frequency equations
• Maximum bridge frequency
(8)
Where C
par
= 4.7 pF and t
dch
= 0.4 s.
• Minimum bridge frequency with disabled boost
(9)
• Minimum bridge frequency with enabled boost
(10)
11.1.4 R
SLS
related preheat current
(11)
(12)
11.1.5 R
MDL
related minimum dimming level
• MDL threshold voltage
(13)
f
bridge max
0.5
C
CF
C
par
+
I
oCFmax
---------------------------
V
th CFmax
t
dch
+
----------------------------------------------------------------------------
=
f
bridge min
0.5
C
CF
C
par
+
I
oCFmin
---------------------------
V
th CFmax
t
dch
+
----------------------------------------------------------------------------
=
f
bridge bstmin
0.5
C
CF
C
par
+
I
obstCF
---------------------------
V
th CFmax
t
dch
+
----------------------------------------------------------------------------
=
I
ph M
V
ph SLS
R
SLS
--------------------
=
I
ph RMS
V
ph SLS
R
SLS
3
-------------------------
V
MDL
R
MDL
I
source MDL
=
UBA20260 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2011. All rights reserved.
Product data sheet Rev. 2 — 10 October 2011 24 of 30
NXP Semiconductors
UBA20260
600 V driver IC for step dimmable CFLs
11.2 Application Diagram
Detailed in Table 6 is a list of typical application components. See Figure 12.
Fig 12. UBA20260 default application diagram
001aam771
R9
R1
R8
R
MDL
R
REF
L1
D5 D6
C
CB
C
CF
C
CP
C15
C16
C6
C11
CFL
C3
R
SLS
R
CSI
R6
D7
R5
Q1
Q2
FS
HBO
CB
CP
CI
MDL
RREF
CF
12
11
8
7
5
6
GHS
GLS
PGND
V
DD
SLS
CSI
n.c.
14
15
16
2
4
1
9
10
C1 C2
C12
C7
C9
C10 C13
C8
L2
C5
C4
D3
D4
D8
D1 D2
UBA20260
SGND
313
C17
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UBA20260T/1,518

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Manufacturer:
NXP Semiconductors
Description:
IC CFL LAMP DVR 600V 16-SOIC
Lifecycle:
New from this manufacturer.
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