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零件编号 | UBA2072 | ||
描述 | Low Voltage Full-bridge control IC | ||
制造商 | NXP Semiconductors | ||
LOGO | |||
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UBA2072
Low Voltage Full-bridge control IC for CCFL backlighting
Rev. 08.0 — February 2007
Preliminary data sheet
1. General description
The UBA2072 is a low voltage IC intended to drive Cold Cathode Fluorescent Lamps
(CCFLs) for back-lighting applications. The IC contains level-shifters, bootstrap diodes
and drivers for the external full-bridge power switches.
Furthermore, the UBA2072 has a build-in HF oscillator which determines the operating
frequency, a phase shift controller for obtaining constant lamp current, and a PWM
generator which is used to set the brightness level of the CCFLs.
The UBA2072 is designed to operate over a wide low voltage inverter supply range, up to
30V. The IC can be supplied directly from the inverter supply.
2. Features
Wide supply voltage range (9 V to 30 V DC)
Adjustable maximum fault timing
Integrated level-shifters
Integrated bootstrap diodes
Lamp current control
Over-voltage control
Over-current protection
Ignition failure detection
Arcing detection
Brightness level adjustment through PWM dimming
Integrated PWM generator
3. Applications
LCD-backlighting, including LCD-TV and LCD-Monitor applications. The IC is intended
to drive and control a full-bridge inverter with resonant load circuit for CCFLs, but can
also drive an array of External Electrode Fluorescent Lamps (EEFLs).
Free Datasheet http://www.Datasheet4U.com
NXP Semiconductors
UBA2072
Low Voltage Full-bridge control IC for CCFL backlighting
Fig 7. Timing diagram of the initial ignition frequency sweep
During PWM dimming the switching frequency is constant. Only the phase shift is swept
from its regulated value to its minimum value and back. The phase shift sweep has to
provide re-ignition of the lamps, therefor the unloaded resonance curve of Figure 6 has to
be high enough at the normal operation switching frequency Fs(min).
The voltage at the CVFB-pin is inverse proportional to the switching frequency,(see
Figure 8). The voltage at the CVFB-pin is clamped at the voltage VCVFB(range) were the
switching frequency is Fs(min).
The voltage at the CSWP-pin is proportional to the phase shift (see Figure 8). The voltage
at the CSWP-pin is clamped at the low side at VCSWP(lclamp) and at the high side at VCIFB.
Because VCIFB is clamped at VCIFB(hclamp), VCSWP is also clamped.
Fig 8. frequency and phase shift as function of CVFB and CSWP voltages
UBA2072
Preliminary data sheet
Rev. 08.0 — February 2007
© NXP B.V. 2007. All rights reserved.
8 of 28
Free Datasheet http://www.Datasheet4U.com
NXP Semiconductors
UBA2072
Low Voltage Full-bridge control IC for CCFL backlighting
Table 3: Limiting values …continued
In accordance with the Absolute Maximum Rating System (IEC 60134). All voltages are measured with respect to signal
ground (pin 7); positive currents flow into the chip. The voltage ratings are valid provided other ratings are not violated.
Symbol
VESD
Parameter
Conditions
electrostatic discharge voltage
human body model
IFB, CIFB, VFB, CVFB, IREF, CT,
CF, CSWP, CPWM, nonFAULT,
PWMa, PWMd, EN, VDC, VDD,
GLA, GLB
GHB, FSB, SHB, SHA, FSA, GHA
machine model
all pins
Min Max Unit
-2 +2 kV
-1
-250
+1
+250
kV
V
Latchup
SNW-FQ-303
all pins
9. Thermal characteristics
Table 4:
Symbol
Rth(j-a)
Thermal characteristics
Parameter
thermal resistance from
junction to ambient
Conditions
in free air; SO28 package
in free air; SSOP28 package
Typ Unit
68 K/W
108 K/W
10. Characteristics
Table 5: Characteristics
Tamb = 25 °C; VVDC = 15 V; VEN=VVDD; CVDD=100nF; RIREF = 33 kΩ and CPWM pin connected to a capacitor, unless
otherwise specified. All voltages are measured with respect to signal ground (pin 7); currents are positive when flowing into
the IC.
Symbol
Parameter
Conditions
Min Typ Max Unit
Start-up
VVDC(start)
VVDC(stop)
VVDC(hys)
Supply
IVDC(on)
IVDC(on)
IVDC(off)
IVDC(off)
VVDD(reg)
VVDD(reg)
VVDC-VVDD
Vboot
Ignition
Fs(max) / Fs(min)
VCVFB(range)
ICVFB(charge)
start-up voltage level
stop voltage level
start-stop hysteresis level
total supply current on pin VDC oscillating
total supply current on pin VDC VDC=30V; oscillating
total supply current on pin VDC VEN=0V
total supply current on pin VDC VDC=30V; VEN=0V
Regulated voltage on pin VDD VDC=30V; VEN=0V
Regulated voltage on pin VDD non-oscillating; IVDD=-36mA
at maximum supply current
Dropout voltage VDD regulator VDC=10V; oscillating;
voltage drop bootstrap diode IFSA = IFSB = 5mA
VCO frequency ratio
VCO voltage range
CVFB charge current
VVFB=2V, VCVFB=2V
8.6 9
7.7 8
0.9 1
9.4 V
8.3 V
1.1 V
[1]
[1]
11.3 12
11
5 mA
7.5 mA
1.5 mA
2 mA
12.7 V
V
[1] 1.5
1.5
V
V
2.2 2.4 2.6
2.5 V
-24 -21 -18 µA
UBA2072
Preliminary data sheet
Rev. 08.0 — February 2007
© NXP B.V. 2007. All rights reserved.
16 of 28
Free Datasheet http://www.Datasheet4U.com
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页数 | 28 页 | ||
下载 | [ UBA2072.PDF 数据手册 ] |
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