03/25/05
Preliminary
Specifications and Applications
Information
Package Configuration
P443298
Two Lamp
DC to AC Inverter
The ERG P443298 inverter was specifically
designed to power the Sharp LQ080Y5DR02 display
from a regulated +12 volt DC source.
The P443298 may be dimmed using an external
pulse width modulated control signal.
Inverter shown with pins pointing up.
J1-1 Vin
J1-2 GND
J1-3 Enable
J1-4 ACout
J1-5 ACout
J1-8 ACcommon
Pin Descriptions
2.53[64,3]
Max
2.300
[58,42]
.12[3,05]
.13[3,3]
.200[5,08]
.500[12,70]
.700[17,78]
.950[24,1]
Max
.600
[15,24]
3
1
8
5 4
2
PCB Mountable
High Efficiency
Fully Encapsulated
External Control and PWM Dimming
Designed, Manufactured and Supported in
the USA
One Year Warranty
P44 Package
Page 1 of 4
P443298
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(Note 1) Reliable and predictable operation of the device are not guaranteed with applied stresses at or beyond those listed in
"Absolute Maximum Ratings". Operation at these limits may reduce device reliability and is therefore not recommended.
Please refer to "Recommended Operating Conditions" for reliable operation of the device.
(Note 2) Operation above 50
o
C is possible if airflow is provided.
(Note 3) Provided data is not tested but guaranteed by design.
(Note 4) An external fuse 1.5 times max. input current should be added.
Page 2 of 4
Application Notes
The P44 series is designed to power one to four cold cathode fluorescent lamps. External shutdown and dimming are
accomplished with the enable pin.
External PWM Dimming:
If external PWM dimming control is required, an external PWM signal is interfaced to
the inverter through the Enable Pin. The external PWM signal should be 160-250Hz with duty cycle variable from 0%
to 100%.
Enable: If no dimming is required, the inverter is turned on/off through the Enable Pin. Pushing the Enable Pin high
enables the inverter. Pulling the Enable Pin low disables the inverter.
High Current Control For Lamp Warm-up:
If the output current per tube shown on page two of this datasheet is
greater than that in the display specification then the inverter has been designed for a higher than specified current to
enhance lamp warm-up. After lamp warm-up, the PWM duty cycle must be reduced to provide input power consistent
with the CCFL rating as shown in Figure 2. Determination of warm-up time and duty cycle reduction is the responsibil-
ity of the end user. Failure to follow this application note may void warranty on the LDB and/or inverter.
Contact ERG for any application questions
P443298
Page 3 of 4
P443298
Endicott Research Group, Inc. (ERG) reserves the right to make changes in circuit design and/
or specifications at any time without notice. Accordingly, the reader is cautioned to verify that
data sheets are current before placing orders. Information furnished by ERG is believed to be
accurate and reliable. However, no responsibility is assumed by ERG for its use.
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9001 A33
13
Connection Diagram
* Low ESR type input bypass capacitor may be required (10uf - 100uf)
** Should be selected to be compatible with LCD and display driver
2
*
1
3
8
4
+ On
- Off
CCF Tubes
5
Enable
or PWM Source
+
-
Vin
+Vin
0% - 100%
approx. 5.5 ms **
Page 4 of 4
Application
Dependent
Figure 2: High Current Control
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