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UBA2025 Datasheet(PDF) 11 Page - NXP Semiconductors

Part # UBA2025
Description  CFL power IC
Download  17 Pages
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Manufacturer  NXP [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo NXP - NXP Semiconductors

UBA2025 Datasheet(HTML) 11 Page - NXP Semiconductors

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UBA2025_1
© NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 01 — 16 October 2009
11 of 17
NXP Semiconductors
UBA2025
CFL power IC
11. Application information
11.1 Design equations
Bottom frequency:
Feed forward frequency:
Where:
– X1 = 3.68
– X2 = 22.28
– t = 0.4
µs
– Rint =3 kΩ
– Cpar = 4.7 pF
– Vref = 2.5 V
– Vi(VDC) = 300 V (nominal)
– RHV = 560 KΩ (see Figure 6)
Operating frequency = fbtm(max), fff(max), and fcm(max)
Where:
– fbtm = bottom frequency
– fff(max) = maximum feed forward frequency
– fcm(max) = maximum frequency due to capacitive mode detection
Preheat time:
Ignition time:
Non-overlap time:
f
btm
1
2C
f
C
par
+
()
X1
R
IREF
×
R
int
()
×
[] t
+
×
----------------------------------------------------------------------------------------------------------- Hz
()
=
f
ff
1
2C
f
C
par
+
()
X2
V
ref
R
HV
×
×
V
iVDC
()
-----------------------------------------
R
int


×
t
+
×
------------------------------------------------------------------------------------------------------------------------- Hz
()
=
t
ph
C
CP
150 nF
------------------
R
ref
30 k
---------------
×
s
()
=
t
ign
15
16
------
t
ph s
()
×
=
t
no
1.4
µs
R
ref
30 k
---------------
×
=


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