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PDF UBA2025 Data sheet ( Hoja de datos )
| Número de pieza | UBA2025 | |
| Descripción | CFL power IC | |
| Fabricantes | NXP Semiconductors | |
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UBA2025
CFL power IC
Rev. 01 — 16 October 2009
Product data sheet
1. General description
The UBA2025 is a high voltage power IC intended to drive and control a Compact
Fluorescent Lamp (CFL). It contains a half bridge power circuit, an oscillator, and a control
circuit for starting up, preheating, ignition, lamp burning, and protection.
2. Features
I Two internal 600 V, 3 Ω max NMOST half bridge powers
I For steady state half bridge currents up to 280 mA
I For ignition half bridge currents up to 1.5 A
I Adjustable preheat and ignition time
I Adjustable preheat current
I Adjustable lamp power
I Lamp temperature stress protection at higher mains voltages
I Capacitive mode protection
I Protection against too low a drive voltage for the power MOSFETs.
3. Applications
I 5 W to 25 W CFLs provided that the maximum junction temperature is not exceeded.
4. Ordering information
Table 1. Ordering information
Type number
Package
Name
UBA2025T
SO16L
Description
plastic small outline package; 16 leads; body width 7.5 mm
Version
SOT162-1
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NXP Semiconductors
UBA2025
CFL power IC
capacitor connected to pin CI. The frequency during preheating will be approximately
90 kHz. This frequency is well above the resonant frequency of the load, which means
that the lamp is off. The load consists of L2, C5 and the electrode resistance only
(see Figure 6). The preheat time is determined by the capacitor connected to pin CPAV.
The circuit can be locked in the preheat state by connecting pin CPAV to ground. During
preheating the circuit monitors the load current by measuring the voltage drop over
external resistor RSHUNT at the end of conduction of T2 with decision level Vshunt. The
frequency is decreased as long as VRS > Vshunt. The frequency is increased for
VRS < Vshunt.
fstart
fbtm
preheat state
Fig 4. Operation in preheat mode
ignition
state
burn state
time
mgs992
7.5 Ignition state
The RS current monitoring function changes from Vshunt regulation to capacitive mode
protection at the end of the preheat time. Normally this results in a further frequency
decrease down to the bottom frequency fbtm (approximately 43 kHz). The frequency
change per ms is lowered with respect to the frequency change in the preheat mode.
During the downward frequency sweep the circuit sweeps through the resonant frequency
of the load. A high voltage will then appear across the lamp. This voltage will normally
ignite the lamp.
7.6 Failure to ignite
Excessive current levels may occur when the lamp fails to ignite. The IC does not limit
these currents in any manner.
7.7 Transition to the burn state
Assuming that the lamp has ignited during the downward frequency sweep, the frequency
normally decreases to the bottom frequency. The IC can transit to the burn state in two
ways:
• In the event that the bottom frequency is not reached, the transition is made after
reaching the ignition time tign.
• As soon as the bottom frequency is reached.
The bottom frequency is determined by resistor RIREF and capacitor CF.
UBA2025_1
Product data sheet
Rev. 01 — 16 October 2009
© NXP B.V. 2009. All rights reserved.
5 of 17
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NXP Semiconductors
UBA2025
CFL power IC
11. Application information
11.1 Design equations
• Bottom frequency:
f btm = -2----×-----[--(---C-----f---+-----C-----p--a---r--)----×-----(--X--1---1----×-----R----I--R---E---F----–-----R----i-n---t--)--]----+-----t(Hz)
• Feed forward frequency:
f ff = 2-----×--------(--C-----f---+-----C-----p---a--r---)---×---------X--------2--------1-×-----V-----V---i---(---r-V---e---D-f------C-×------)----R--------H-------V------–-----R----i-n---t--------+-----t(Hz)
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:
t ph = 1----5-C--0--C---nP---F-- × 3---R-0---r--ke---fΩ---(s)
• Ignition time:
tign = 11----56- × t ph(s)
• Non-overlap time:
tno = 1.4 µs × 3---R0----r--ke---fΩ---
UBA2025_1
Product data sheet
Rev. 01 — 16 October 2009
© NXP B.V. 2009. All rights reserved.
11 of 17
Datasheet pdf - http://www.DataSheet4U.net/
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet UBA2025.PDF ] | |
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