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PDF UBA2028 Data sheet ( Hoja de datos )
| Número de pieza | UBA2028 | |
| Descripción | 600 V dimmable power IC | |
| Fabricantes | NXP Semiconductors | |
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UBA2028
600 V dimmable power IC for compact fluorescent lamps
Rev. 01 — 9 October 2009
Product data sheet
1. General description
The UBA2028 is a high voltage power IC that drives and controls electronically ballasted
Compact Fluorescent Lamps (CFLs). The IC includes a Metal-Oxide-Semiconductor
Transistor (MOST) half bridge power circuit, a dimming function, a high voltage level shift
circuit, an oscillator function, a lamp voltage monitor, a current control function, a timer
function and protections.
2. Features
I Two internal 600 V, 3 Ω max MOST half bridge powers.
I For steady state currents up to 280 mA.
I For ignition currents up to 1.5 A.
I Adjustable preheat time.
I Adjustable preheat current.
I Current controlled operating.
I Single ignition attempt.
I Adaptive non-overlap time control.
I Integrated high voltage level shift function.
I Power-down function.
I Protection against lamp failures or lamp removal.
I Capacitive mode protection.
3. Applications
I 5 W to 25 W dimmable CFLs, provided that the maximum junction temperature is not
exceeded.
Datasheet pdf - http://www.DataSheet4U.net/
1 page  
www.DataSheet.co.kr
NXP Semiconductors
UBA2028
600 V dimmable power IC for compact fluorescent lamps
8. Functional description
8.1 Start-up state
Initial start-up can be achieved by charging the low-voltage supply capacitor at pin 16 (see
Figure 8 Figure 9) via an external start-up resistor. Start-up of the circuit is achieved under
the condition that both half-bridge transistors TR1 and TR2 are non-conductive. The
circuit will be reset in the start-up state. If the low-voltage supply (VDD) reaches the value
of VDD(startup) the circuit will start oscillating. A DC reset circuit is incorporated in the
High-Side (HS) driver. Below the lockout voltage at the FS pin the output voltage (TR1
gate voltage − VSH) is zero. The voltages at pins CF and CT are zero during the start-up
state.
8.2 Oscillation
The internal oscillator is a Voltage Controlled Oscillator (VCO) circuit which generates a
sawtooth waveform between the Vo(osc)max level and 0 V. The frequency of the sawtooth is
determined by capacitor CCF, resistor RIREF, and the voltage at pin CSW. The minimum
and maximum switching frequencies are determined by RIREF and CCF; their ratio is
internally fixed. The sawtooth frequency is twice the half-bridge frequency. The UBA2028
brings the transistors TR1 and TR2 into conduction alternately with a duty cycle of
approximately 50 %. An overview of the oscillator signal and driver signals is illustrated in
Figure 7. The oscillator starts oscillating at fmax. During the first switching cycle the
Low-Side (LS) transistor (TR2) is switched on. The first conducting time is made extra
long to enable the bootstrap capacitor to charge.
8.3 Adaptive non-overlap
The non-overlap time is realized with an adaptive non-overlap timing circuit (ANT). By
using an adaptive non-overlap circuit, the application can determine the duration of the
non-overlap time and make it optimum for each frequency; see Figure 7. The non-overlap
time is determined by the slope of the half-bridge voltage, and is detected by the signal
across resistor R15 see Figure 8 (R6 in Figure 9) which is connected directly to pin ACM.
The minimum non-overlap time is internally fixed. The maximum non-overlap time is
internally fixed at approximately 25 % of the bridge period time. An internal filter of 30 ns
is included at the ACM pin to increase the noise immunity.
8.4 Timing circuit
A timing circuit is included to determine the preheat time and the ignition time. The circuit
consists of a clock generator and a counter.
The preheat time is defined by CCT and RIREF connected to pins 10 and 13, and consists
of 7 pulses at CCT; the maximum ignition time is 1 pulse at CCT. The timing circuit starts
operating after the start-up state, as soon as the low supply voltage (VDD) has reached
VDD(startup) or when a critical value of the lamp voltage (Vlamp(fail)) is exceeded. When the
timer is not operating CCT is discharged to 0 V at 1 mA.
UBA2028_1
Product data sheet
Rev. 01 — 9 October 2009
© NXP B.V. 2009. All rights reserved.
5 of 21
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NXP Semiconductors
UBA2028
600 V dimmable power IC for compact fluorescent lamps
9. Limiting values
Table 4. Limiting values
In accordance with the Absolute Maximum Rating System (IEC 60134). All voltages referenced to GND.
Symbol Parameter
Conditions
Min Max
VHV voltage on pin HV
operating; during 1 s
operating
- 600
- 510
ID drain current
VVDD
VFS
Vi(ACM)
Vi(PCS)
Vi(LVS)
Vi(CSP)
Vi(CSN)
Vi(CSW)
SR
voltage on pin VDD
voltage on pin FS
input voltage on pin ACM
input voltage on pin PCS
input voltage on pin LVS
input voltage on pin CSP
input voltage on pin CSN
input voltage on pin CSW
slew rate
TR1 pulsed; tp limited by Tj(max);
T < Tj(max)
TR2 pulsed; tp limited by Tj(max);
T < Tj(max)
with respect to SH
pin SH; repetitive
- 1.5
- 1.5
- 14
0 14
−5 +5
−5 +5
05
05
−0.3 +5
05
−4 +4
Tamb
Tj
Tstg
VESD
ambient temperature
junction temperature
storage temperature
electrostatic discharge voltage
pin HV
pins FS, SH
−25
−25
−55
[1] -
[1] -
+80
+150
+150
1500
1000
pin GL
[1] -
< 500
pin GL
[2] -
150
Unit
V
V
A
A
V
V
V
V
V
V
V
V
V/ns
°C
°C
°C
V
V
V
V
[1] In accordance with the human body model, i.e. equivalent to discharging a 100 pF capacitor through a 1.5 kΩ series resistor.
[2] In accordance with the machine model, i.e. equivalent to discharging a 200 pF capacitor through a 0.75 µH coil and a 10 Ω resistor.
10. Thermal characteristics
Table 5.
Symbol
Rth(j-a)
Thermal characteristics
Parameter
thermal resistance from junction to ambient
Conditions
SO20L; in free air
Typ Unit
75 K/W
UBA2028_1
Product data sheet
Rev. 01 — 9 October 2009
© NXP B.V. 2009. All rights reserved.
11 of 21
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