INTEGRATED CIRCUITS
DATA SHEET
UBA2070
600 V CCFL ballast driver IC
Product specification
Supersedes data of 2001 Sep 27
2002 Oct 24
Philips Semiconductors
Product specification
600 V CCFL ballast driver IC
UBA2070
FEATURES
•
Current controlled operation
•
Adaptive non-overlap time control
•
Integrated high voltage level shift function
•
Power-down function
•
Protected against lamp failures or lamp removal
•
Capacitive mode protection.
APPLICATION
•
The circuit topology enables a broad range of backlight
inverters.
ORDERING INFORMATION
GENERAL DESCRIPTION
The UBA2070 is a high voltage integrated circuit for driving
electronically ballasted Cold Cathode Fluorescent Lamps
(CCFL) at mains voltages up to 277 V (RMS) (nominal
value). The circuit is made in a 650 V Bipolar CMOS
DMOS (BCD) power logic process. The UBA2070
provides the drive function for the two discrete MOSFETs.
Besides the drive function the UBA2070 also includes the
level-shift circuit, the oscillator function, a lamp voltage
monitor, a current control function, a timer function and
protections.
PACKAGE
TYPE NUMBER
NAME
UBA2070T
UBA2070P
SO16
DIP16
DESCRIPTION
plastic small outline package; 16 leads; body width 3.9 mm
plastic dual in-line package; 16 leads (300 mil); long body
VERSION
SOT109-1
SOT38-1
2002 Oct 24
2
Philips Semiconductors
Product specification
600 V CCFL ballast driver IC
UBA2070
QUICK REFERENCE DATA
SYMBOL
High voltage supply
V
hs
Start-up state
V
DD(high)
V
DD(low)
I
DD(start)
oscillator start voltage
oscillator stop voltage
start-up current
V
DD
< V
DD(high)
I
L
= 10
µA
12.4
8.6
−
13
9.1
170
13.6
9.6
200
V
V
µA
high side supply voltage
I
hs
< 30
µA;
t < 1 s
−
−
600
V
PARAMETER
CONDITION
MIN.
TYP.
MAX.
UNIT
Reference voltage (pin V
REF
)
V
ref
f
bridge(max)
f
bridge(min)
I
source
I
sink
reference voltage
2.86
2.95
3.04
V
Voltage controlled oscillator
maximum bridge frequency
minimum bridge frequency
V
GH
−
V
SH
= 0; V
GL
= 0
V
GH
−
V
SH
= 13 V;
V
GL
= 13 V
90
38.9
100
40.5
110
42.1
kHz
kHz
Output drivers (pins GH and GL)
source current
sink current
135
265
180
300
235
415
mA
mA
Lamp voltage sensor (pin LVS)
V
LVS(fail)
V
LVS(max)
V
offset
g
m
V
OL
V
OH
fail voltage level
maximum voltage level
1.19
1.67
−2
100
−
−
1.25
1.76
1.31
1.85
V
V
Average current sensor (pin CS)
offset voltage
transconductance
V
CS
= 0 to 2.5 V
f = 1 kHz
0
200
+2
400
−
−
mV
µA/mV
V
V
Ignition timer (pin CT)
LOW-level output voltage
HIGH-level output voltage
1.4
3.6
2002 Oct 24
3
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dbook, full pagewidth
2002 Oct 24
SUPPLY
n.c.
8
GND
5
IGNITION TIMER
BLOCK DIAGRAM
Philips Semiconductors
600 V CCFL ballast driver IC
VDD
7
VREF
3 V 14
9
reference
voltages
supply (5 V)
VDD(clamp)
BOOTSTRAP
LEVEL
SHIFTER
HS
DRIVER
10
FVDD
digital
analog
GH
11
VDD(low)
DRIVER
LOGIC
reset
LS
DRIVER
6
SH
GL
STATE LOGIC
LOGIC
CT
1
•
reset state
•
ignition state
•
burn state
•
hold state
•
powerdown state
ANT/CMD
12
ACM
4
VOLTAGE
CONTROLLED
OSCILLATOR
REFERENCE
CURRENT
I
V
4
IREF
3
CF
LOGIC
LAMP
VOLTAGE
SENSOR
AVERAGE
CURRENT
SENSOR
FREQUENCY
CONTROL
15
16
CS
+
CS
−
VLVS(fail)
VLVS(max)
Product specification
UBA2070
13
LVS
2
MGT990
CSW
Fig.1 Block diagram.
Philips Semiconductors
Product specification
600 V CCFL ballast driver IC
UBA2070
PINNING
SYMBOL
CT
CSW
CF
I
REF
GND
GL
V
DD
n.c.
FV
DD
GH
SH
ACM
LVS
V
REF
CS+
CS−
PIN
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
ignition timer output
voltage controlled oscillator input
voltage controlled oscillator output
internal reference current input
ground
gate of the low side switch output
low voltage supply
not connected
floating supply; supply for the high side switch
gate of the high side switch output
source of the high side switch
capacitive mode input
lamp voltage sensor input
reference voltage output
average current sensor positive input
average current sensor negative input
DESCRIPTION
handbook, halfpage
CT 1
CSW 2
CF 3
IREF 4
GND 5
GL 6
VDD 7
n.c. 8
MGT985
16 CS
−
15 CS
+
14 VREF
13 LVS
handbook, halfpage
CT 1
CSW 2
CF 3
IREF 4
GND 5
GL 6
VDD 7
n.c. 8
MGT984
16 CS
−
15 CS
+
14 VREF
13 LVS
UBA2070T
12 ACM
11 SH
10 GH
9
FVDD
UBA2070P
12 ACM
11 SH
10 GH
9
FVDD
Fig.2 Pin configuration (SO16).
Fig.3 Pin configuration (DIP16).
2002 Oct 24
5
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