Durel Division
2225 W. Chandler Blvd.
Chandler, AZ 85224-6155
Tel: 480.917.6000 / FAX: 480.917.6049
www.rogerscorporation.com
Data Sheet
D305A IC Electroluminescent Lamp Driver IC
Features
High AC Voltage Output Up To 400Vpp
Very Low Standby Current
Flexible Wave-shaping Capability
External Clock Compatible
Small MSOP-10 package
Available in Lead-Free (Pb-free) and
Green MSOP-10 package
MSOP-10
Applications
White EL Lamp Backlight for Color LCD
Wireless Handset
PDA
GPS
Other Handheld Portable Electronics
DFLX
TM
EL Keypad Lamps
Rogers DUREL® D305A IC is a high-power inverter
intended for driving EL lamps as large as
100cm
2
.The D305A IC is equipped with many control
functions, including: wave-shaping programmability
for frequencies, and stability of lamp color over wide
temperature extremes.
Lamp Driver Specifications:
(Using
Standard Test Circuit
at Ta=25
0
C unless otherwise specified)
Parameter
Symbol Minimum Typical* Maximum
Standby Current
1
5
Supply Current
I
bat
85
99
115
Logic Supply Current
I
cc
16
17
19
Output Voltage
V
out
264
297
330
Lamp Frequency
LF
425
473
525
* Note - Typical values should not be used for specification limits.
Units
uA
mA
mA
Vpp
Hz
Conditions
E = GND
E = V
cc
E = V
cc
E = V
cc
E = V
cc
Standard Test Circuit
BAS21
470uH / DCR = 1Ω
1 Va
L
10
5V
Load B
2.2nF
(200V)
2
3
Cs
Vb
E
Vcc
D305A
GND 9
Rf
8
100pF
ON
OFF
10kΩ
100kΩ
4
5
3V
CLF 7
6.8nF
CHF 6
180pF
The information contained in this data sheet is intended to assist you in designing with Rogers EL systems. It is not intended to
and does not create any warranties, express or implied, including any warranty of merchantability or fitness for a particular
purpose or that the results shown on the data sheet will be achieved by a user for a particular purpose. The user should
determine the suitability of Rogers’ EL systems for each application.
LIT-I9046 A05
Page 1 of 14
Load B*
Output Waveform
47 nF
100
Ω
10 kΩ
22 nF
*Load
B approximates a 5in
2
(32.3cm
2
) EL
lamp.
Absolute Maximum Ratings:
Parameter
Supply voltage
Operating Range
Withstand Range
Logic Drive Voltage
Operating Range
Withstand Range
Enable Voltage
Lamp Output Voltage
Operating Temperature
Storage Temperature
V
cc
E
Va - Vb
T
a
T
s
Symbol
V
bat
Minimum
2.5
-0.5
2
-0.5
-0.5
-40
-55
Maximum
7.0
16
5
6
(Vcc) + 0.5
410
85
150
Unit
V
Comments
E = V
cc
E = GND
E = V
cc
E = GND
E = V
cc
Ambient
V
V
Vpk-pk
°C
°C
Note: The above table reflects ratings only. Functional operation of the device at these ratings or any other above
those indicated in the specifications is not implied. Exposure to absolute maximum rating conditions for extended
periods of time may affect reliability.
Physical Data:
PIN #
1
2
3
4
5
6
7
8
9
10
NAME
Va
Cs
Vb
E
Vcc
CHF
CLF
Rf
GND
L
FUNCTION
AC voltage output to EL lamp
High voltage storage capacitor input
AC voltage output to EL lamp
System enable; Wave-shaping resistor control
Logic drive voltage
Capacitor input to high frequency oscillator
Capacitor input to low frequency oscillator
Resistor input for frequency control
Power ground
Inductor input
1
10
2
9
3
8
4
7
5
6
The information contained in this data sheet is intended to assist you in designing with Rogers EL systems. It is not intended to and
does not create any warranties, express or implied, including any warranty of merchantability or fitness for a particular purpose or
that the results shown on the data sheet will be achieved by a user for a particular purpose. The user should determine the suitability
of Rogers’ EL systems for each application.
LIT-I9046 A05
Page 2 of 14
Performance Characteristics
600
500
400
300
200
100
0
1
2
3
4
5
6
7
8
600
500
400
300
200
100
0
-40
-20
0
20
40
60
80
LF (Hz)
LF (Hz)
DC Input Voltage
400
400
Temperature (
o
C)
Output Voltage (Vpp)
Output Voltage (Vpp)
350
300
250
200
150
100
50
0
1
2
3
4
5
6
7
8
350
300
250
200
150
100
50
0
-40
-20
0
20
40
o
60
80
100
DC Input Voltage
Avg Supply Current (mA)
Avg Supply Current (mA)
140
120
100
80
60
40
20
0
1
2
3
4
5
6
7
8
140
120
100
80
60
40
20
0
-40
-20
Temperature ( C)
0
20
40
60
80
100
DC Input Voltage
Temperature (
o
C)
The information contained in this data sheet is intended to assist you in designing with Rogers EL systems. It is not intended to and
does not create any warranties, express or implied, including any warranty of merchantability or fitness for a particular purpose or
that the results shown on the data sheet will be achieved by a user for a particular purpose. The user should determine the suitability
of Rogers’ EL systems for each application.
LIT-I9046 A05
Page 3 of 14
Block Diagram of the Driver Circuitry
Theory of Operation
Electroluminescent (EL) lamps are essentially capacitors with one transparent electrode and a special
phosphor material in the dielectric. The phosphor glows when a strong AC voltage is applied across the
EL lamp electrodes. The required AC voltage is typically not present in most systems and must be
generated from a low voltage DC source.
The D305A IC inverter drives the EL lamp by using a switching transistor to repeatedly charge an
external inductor and discharge it to the high voltage capacitor Cs. The discharging causes the voltage at
Cs to continually increase. When the voltage at Cs reaches a nominal value, the switching transistor is
turned off. The internal circuitry uses the H-bridge technology, using both electrodes to drive the EL
lamp. One of the outputs, Va or Vb, is used to discharge Cs into the EL lamp during the first half of the
low frequency (LF) cycle. By alternating the state of the H-bridge, the other output is used to charge the
EL lamp during the second half of the LF cycle. The alternating states make it possible to achieve 400V
peak-to-peak across the EL lamp.
The EL driving system is divided into several parts: on-chip logic control, on-chip high voltage output
circuitry, on-chip discharge logic circuitry, and off-chip components. The on-chip logic controls the lamp
operating frequency (LF) and the inductor switching frequency (HF). These signals are used to drive the
high voltage output circuitry (H-bridge) by delivering the power from the inductor to the lamp. The
integrated discharge logic circuitry uses a patented wave-shaping technique for reducing audible noise
from an EL lamp. Changing the Rd value changes the slope of the linear discharge as well as the shape
of the waveform. The off-chip component selection provides a degree of flexibility to accommodate
various lamp sizes, system voltages, and brightness levels.
Typical D305A IC EL driving configurations for driving EL lamps in various applications are shown on the
following page. The expected system outputs for the various circuit configurations are also shown with
each respective figure. These examples are only guides for configuring the driver. Rogers provides a
D305A IC Designer’s Kit, which includes a printed circuit evaluation board intended to aid you in
developing an EL lamp driver configuration using the D305A IC that meets your requirements. A section
on designing with the D305A IC is included in this datasheet to serve as a guide to help you select the
appropriate external components to complete your D305A IC EL driver system.
The information contained in this data sheet is intended to assist you in designing with Rogers EL systems. It is not intended to and
does not create any warranties, express or implied, including any warranty of merchantability or fitness for a particular purpose or
that the results shown on the data sheet will be achieved by a user for a particular purpose. The user should determine the suitability
of Rogers’ EL systems for each application.
LIT-I9046 A05
Page 4 of 14
Reference D305A EL Driver Configurations
Several D305A IC configurations for driving EL lamps in various applications are shown below. The
expected system outputs, such as lamp luminance, lamp output frequency and voltage and average
supply current draw for the various sample configurations are also shown with each respective figure.
Handset Color LCD Backlight
Characteristic Output
Brightness =19.5 fL (66 cd/m
2
)
Lamp Frequency = 500 Hz
Logic Supply Current = 20 mA
Power Supply Current = 66 mA
Vout = 310 Vpp
Load: 2in
2
(12.9cm
2
) DUREL
®
3 White EL
BAS21
220µH
Sumida CLS62
1
Load
2.2 nF
(200V)
Va
Cs
Vb
E
Vcc
L
GND
Rf
CHF
CHF
D305A
10
3.3V
2
3
9
100 pF
8
7
6
100k Ohms
ON
OFF
Conf
10k Ohms
4
5
5.6 nF
3.3 V
180 pF
PDA Display
Characteristic Output
Brightness =18.5 fL (63 cd/m
2
)
Lamp Frequency = 358 Hz
Logic Supply Current = 18 mA
Power Supply Current = 87 mA
Vout = 408 Vpp
Load: 5in
2
(32.2cm
2
) DUREL 3 Green EL
BAS21
470µH
TDK SLF7032
1
Load
2.2 nF
(200V)
Va
Cs
Vb
E
Vcc
L
GND
Rf
CHF
CHF
D305A
10
5.0V
2
3
9
100 pF
8
7
6
100k Ohms
ON
OFF
Conf
10k Ohms
5.0V
4
5
8.2 nF
180 pF
Bright Blue Backlight for LCD
Characteristic Output
Brightness =21.5 fL (73 cd/m
2
)
Lamp Frequency = 415 Hz
Logic Supply Current = 19 mA
Power Supply Current = 68 mA
Vout = 408 Vpp
Load: 1in
2
(6.5 cm
2
) DUREL 3 Blue EL
BAS21
220µH
Coilcraft
LPO2506
1
Load
2.2 nF
(200V)
Va
Cs
Vb
E
Vcc
L
GND
Rf
CHF
CHF
D305A
10
3.6V
2
3
9
100 pF
8
7
6
100k Ohms
ON
OFF
Conf
10k Ohms
3.6V
4
5
6.8 nF
180 pF
The information contained in this data sheet is intended to assist you in designing with Rogers EL systems. It is not intended to and
does not create any warranties, express or implied, including any warranty of merchantability or fitness for a particular purpose or
that the results shown on the data sheet will be achieved by a user for a particular purpose. The user should determine the suitability
of Rogers’ EL systems for each application.
LIT-I9046 A05
Page 5 of 14
RF/无线
