Display Drivers. XR-2288 Datasheet

XR-2288 Drivers. Datasheet pdf. Equivalent


Exar XR-2288
XR-2284/2288
High-Voltage AC Plasma Display Drivers
GENERAL DESCRIPTION
FUNCTIONAL BLOCK DIAGRAMS
The XR-2284 and the XR-2288 are high voltage display
driver arrays especially designed for interfacing with ac
plasma display systems. The XR-2284 contains four in-
dependent driver channels, whereas its dual version,
the XR-2288, contains eight driver channels. Each driv-
er array can be used for either the segment or the col-
umn (or digit) drive, and several arrays can be
"stacked" together to drive a large number of display
segments.
NC
NC
l
OUTPUTS
J
TOGGLE
INPUT
All four channels of the XR-2284 are driven by a com-
mon ac toggle voltage; however, the XR-2288 has two
independent toggle inputs, one for each of the four
channels in the IC. The XR-2284 and the XR-2288 are
designed for 360 volt ac plasma systems and have min-
imum stand-off voltages of 90 volts. The XR-2284C and
the XR-2288C are designed for 240 volt plasma sys-
tems, and have minimum stand-off voltages of 60 volts.
NC
The circuits can operate with ac toggle frequencies up
to 200 kHz, and each driver channel can sink or source
100 mA of capacitive load current. For proper opera-
tion, the substrate terminals of all drivers must be
grounded through an external disconnect diode, DX, as
shown in the schematic diagram.
FEATURES
High Stand-off Voltage
90 V minimum for XR-2284/XR-2288
60 V minimum for XR-2284C/XR-2288C
Very Low AC Standby Power
("'" 25 mW/channel at 100 kHz)
Zero DC Standby Power
100 mA Output Drive Capability
TIL and CMOS Compatible Inputs
Digital or Segment Drive Capability
APPLICATIONS
High Voltage AC Plasma Panels
High Voltage Pulsed Displays
Pulsed AC Switching
ABSOLUTE MAXIMUM RATINGS
Toggle Input Voltage
XR-2284P/XR-2288P
XR-2284CP/XR-2288CP
±90V peak
±60B peak
Power Dissipation
XR-2284P/XR-2284CP
XR-2288P/XR-2288CP
Derate above + 25°C
Storage Temperature
ORDERING INFORMATION
Part Number
XR-2284P
XR-2284CP
XR-2288P
XR-2288CP
Package
Plastic
Plastic
Plastic
Plastic
625 mW
900 mW
5 mW/oC
- 65°C to 150°C
Operating Temperature
O°C to 70°C
O°C to 70°C
O°C to 70°C
O°C to 70°C
7-7


XR-2288 Datasheet
Recommendation XR-2288 Datasheet
Part XR-2288
Description High-Voltage AC Plasma Display Drivers
Feature XR-2288; XR-2284/2288 High-Voltage AC Plasma Display Drivers GENERAL DESCRIPTION FUNCTIONAL BLOCK DIAGRAMS.
Manufacture Exar
Datasheet
Download XR-2288 Datasheet




Exar XR-2288
XR·2284/2288
ELECTRICAL CHARACTERISTICS
Test Conditions: Test Circuit of Figure 1, with external diode DX = IN4002 or equivalent, TA = 25°C, unless otherwise
specified. (See operating precautions.)
PARAMETERS
XR-2284/XR-2288 XR-2284C/XR-2288C
MIN TYP MAX MIN TYP MAX UNIT SYMBOL CONDITIONS
Maximum Toggle Voltage ±90
Output Current Capability
Max Sourcing Current 100
150
Max Sinking Current 100 120
Output Voltage
High Output)
(selected)
High Output
(non-selected)
Low output
(VT-4)
4V
(-VT+2)
Maximum Toggle
Frequency
200
High-Level Input
2 1.4
Low-Level Input
1.2 0.8
Input Current
8 16
Switching Characteristics
Rise Delay
Fall Delay
(selected)
Fall Delay
(non-selected)
500
500
500
±60
100
100
100
2
V pp
VT Peak-to-peak
AC voltage-
See Figure 3.
120
120
(VT-4)
4V
(-VT+2)
200
mA
mA
Vpeak
Isource
Isink
VOHS
12 % Duty Cycle
12 % Duty Cycle
See Figure 4.
VOHN
Vpeak
kHz
VOL
fT
1.4 V VIH
1.2 0.8 V
VIL
8
16 mA
liN See Figure 3.
See Figure 4.
500
nsec
trd
500 nsec tfds
500 nsec tfdn
IMPORTANT OPERATING PRECAUTIONS
1. External diode DX with reverse breakdown voltage
~ VT must be included in all circuit applications. This
diode decouples or "floats" the IC from the circuit
ground during the negative excursions of the toggle
voltage, Vr.
2. the rise and fall times of toggle voltages, VT, must be
held to a value such that output current of each chan-
5V
150PF
\
l * TrDx~150PF
100K
nel does not exceed 100 mA. This can be done by limit-
ing the slewrate of toggle voltage to:
(
dVT) max
dt
s
100 mA,
CL
where CL is the total load capacitance, including the
capacitance of the display elements, driven by the par-
ticular output.
TOGGLE ~o=v -=-=-=I~/I=-_==_=~_==-\=-\\_==_=~_/_r-/+=-=_==_=~-\-l=\=~
INPUT ~~ ==I=.=t======:)===--=l::.======~
Figure 1. Generalized Test Circuit
Figure 2. Typical Timing Waveforms
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Exar XR-2288
FUNDAMENTALS OF AC PLASMA DISPLAYS
Ac plasma display offer significant advantages over
other alpha-numeric displays such as fluorescent or
LEO type panels. Some of these advantages are the
low cost of the display itself, its wide viewing angle, and
the ease of formatting in the selection of display seg-
ments anc digits. Plasma systems typically require high
voltage (200V or higher) ac drivers operating at rela-
tively high frequencies (100 kHz and up). Although the
plasma display panel is a capacitive load and does not
draw dc current, the display driver output is required to
provide a high output drive current (typically 50 to 100
mA), during the rising and the falling edges of the toggle
voltage, so that the driver output can still follow the ac
toggle voltage at high frequencies.
The ac plasma displays normally require a net voltage
in excess of 200 volts across the display to turn it on. In
practice, this is achieved by "pulsing" the display with
two out-of-phase toggle voltages (VT), such that a net
peak-to-peak voltage of 2VT appears across the select-
ed display portion to make it turn on. Thus, in control-
ling the plasma display, one must control the amplitude
of two peak-to-peak toggle swings, one on the
"segment-side" and the other on the "digit-side" of the
display, where each toggle swing is equal to only one-
half of the total voltage swing needed to light up the dis-
play. For example, for 240 volt ac plasma display sys-
tems, the toggle voltage used (VT) would be 120 volts;
and for 360 volt display systems, 180 volt toggle voltage
will be needed.
PRINCIPLES OF OPERATION
The XR-2284 and the XR-2288 ac plasma display driver
circuits control the drive voltage applied to the segment
or the digit section of an ac plasma panel.
Figure 3 shows the timing waveforms associated with
the ac plasma driver circuit, for the case of a 360 volt
display system (Le., VT = ±90V = 180V pp). In normal
operation, all of the driver channels are driven by a
common ac toggle voltage (VT) shown in Figure 3(a).
When the control input to a driver channel, Vin, is at
"high" state, as shown in Figure 3(b), its output would
be clamped nearly to ground and would follow the neg-
ative excursions of the toggle voltage, Vr- This pro-
duces only 1/2 of the required peak-to-peak voltage
across the particular display segment, which is not
enough to light it. However, if Vin is at a "low" state, the
driver output, Vout, would be enabled and follow close~y
the peak-to-peak excursions of the toggle voltage. This
would then cause the nearly full peak-to-peak swing of
the ac drive to appear across the selected display seg-
ment.
It should be noted that due to the external blocking di-
ode Ox of Figure 1, the monolithic IC substrate is com-
pletely decoupled from ground during the negative ex-
cursion of the toggle voltage and the internal diode, 02,
of the schematic diagram causes the output to follow
the toggle voltage within one diode drop. In this man-
ner, the IC has to withstand only one-half of the total ac
signal swing, or the one-fourth of the total voltage ap·
VIN-----,
OV
(bllnput Yoltage. VIN
V~O"+VT
OV I
= -VT
DE· ACTIVATED
CHANNEL
IACTIVATEOI
CHANNEL
(el Channel output Yoltage. VOUT
Figure 3. Timing Diagram of Circuit Waveforms
pearing across the entire plasma panel.
CIRCUIT DESCRIPTION
Both the XR-2284 and the XR-2288 are multichannel
driver circuits, packaged in 14 and 20-pin dual-in-line IC
packages respectively. The XR-2284 is a four-channel
display driver, whereas the XR-2288 is an eight-channel
circuit, made up of two four-channel driver chips in the
same dual-in-line package. Thus, the XR-2288 has two
toggle voltage and substrate inputs; one for each of the
two four-channel IC chips sharing the same package.
The equivalent circuit diagram for a typical driver chan-
nel is shown in the schematic. All the channels have
their own independent inputs and outputs, but share a
common toggle or clock input and a common substrate
or ground connection. The circuit is designed as a se-
ries connection of two controlled-switches, or SCR's.
The transistors, 03 and 02, form one of the controlled-
switches, and 01 and 04, form the second controlled-
switch. The internal junction capacitance, Cj' causes
COfIIMON TO
AUORIYERS
'COM_TO
ALL DRIYERS
:~
COUMOHTO
AUDRIYERS
COfIIMON TO
AUDAlYERS
Figure 4. Generalized Connection Diagram XR-2284 and
XR-2288.
7-9







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