Durel Division
2225 W. Chandler Blvd.
Chandler, AZ 85224-6155
Tel: 480.917.6000 / FAX: 480.917.6049
www.rogerscorporation.com
Data Sheet
D371A Electroluminescent Lamp Driver IC
Features
•
•
•
•
•
•
Flexible Wave Shaping Capability
High Efficiency
External Clock Compatible
High Voltage AC Output
High Performance With Low-profile Coils
Available in Lead-Free (Pb-free) and Green
MSOP Package
MSOP-10
Rogers DUREL
®
D371A IC driver is part of a
family of highly integrated EL drivers based on
Rogers’ patented three-port (3P) topology,
which offers built-in EMI shielding. This high-
performance device uses a proprietary circuit
design for programmable wave-shaping for low-
noise performance in applications that are
sensitive to audible and electrical noise
.
Applications
Cellular Phones and Handsets
Data Organizers/PDAs
Monochrome LCDs
Remote Controls
DFLX
TM
Keypad
Lamp Driver Specifications:
(Using Standard Test Circuit at Ta=25
0
C unless otherwise specified)
Parameter
Symbol Minimum Typical Maximum
Standby Current
I
(V+)
5
1000
Supply Current
I
15
18
Enable Current
I
ena
15
Output Voltage
V
out
160
188
220
Lamp frequency
LF
190
260
330
Inductor Frequency
HF
23
Unit
nA
mA
uA
Vpp
Hz
Khz
Comments
E=GND
E=3.0V
E=3.0V
Peak-to-Peak voltage
CLF=3.9nF
CHF=68pF
Standard Test Circuit
68 pF
1 CHF
3.9 nF
V+ 10
L+ 9
Vout 8
L- 7
D371A
+3.0 V
2 CLF
3 E
4 DCH
5 GND
0.1
μ
F
3.0V
ON
GND
OFF
2.2 mH /
4 Ohms DCR
N/C 6
Load 2
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 drivers for each application.
LIT-I9028 A13
Page 1 of 15
Load 2*
Typical Output Waveform
100
Ω
10 nF
*Load 2 approximates a 3in
2
EL lamp.
Absolute Maximum Ratings:
Parameter
Supply Voltage
Operating Range
Withstand Range
Enable Voltage
Output Voltage
CHF Voltage
CLF Voltage
Operating Temperature
Storage Temperature
Symbol
V+
E
V
OUT
V
CHF
V
CLF
T
a
T
s
Minimum
2.0
-0.5
-0.5
0
0
-40
-65
Maximum
6.5
9.0
(V
+)
+ 0.5
220
(V
+
)+ 0.3
(V
+
) + 0.3
85
150
Unit
V
V
Vpp
V
V
°C
°C
Comments
E = V+
E = GND
Peak-to-peak Voltage
External clock input
External clock input
Note: The above table reflects stress 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:
1
10
2
9
3
8
4
7
5
6
PIN #
1
2
3
4
5
6
7
8
9
10
NAME
CHF
CLF
E
DCH
GND
N/C
L-
VOUT
L+
V+
FUNCTION
High frequency oscillator capacitor/clock input
Lamp frequency capacitor/clock input
System enable; Wave-shaping resistor control
Wave-Shaping discharge control
System ground connection
No Connect
Negative input to inductor
High voltage AC output to lamp
Positive input to inductor
DC power supply input
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 drivers for each application.
LIT-I9028 A13
Page 2 of 15
Typical Performance Characteristics
400
350
300
250
200
150
100
50
0
2
3
4
5
6
7
DC Input Voltage
400
350
300
250
200
150
100
50
0
-40
LF (Hz)
LF (Hz)
-20
0
20
40
60
80
Temperature (°C)
Output Frequency vs. DC Supply Voltage
Output Frequency vs. Ambient Temperature
240
240
Output Voltage (Vpp)
2
3
4
5
6
7
Output Voltage (Vpp)
200
160
120
80
40
0
DC Input Voltage
200
160
120
80
40
0
-40
-20
0
20
40
60
80
Temperature (°C)
Output Voltage vs. DC Supply Voltage
Output Voltage vs. Ambient Temperature
25
20
15
10
5
0
2
3
4
5
6
7
DC Input Voltage
Avg Supply Current (mA)
30
Avg Supply Current (mA)
30
25
20
15
10
5
0
-40
-20
0
20
40
60
80
Temperature (°C)
Supply Current vs. DC Supply Voltage
Supply Current vs. Ambient Temperature
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 drivers for each application.
LIT-I9028 A13
Page 3 of 15
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. Rogers developed its patented three-port (3P) switch-mode
inverter circuit to convert the available DC supply to an optimal drive signal for high brightness and low-
noise EL lamp applications. Rogers’ 3P topology offers the simplicity of a single DC input, single AC
output, and a shared common ground that provides an integrated EMI shielding.
The D371A IC drives the EL lamp by repeatedly pumping charge through an external inductor with
current from a DC source and discharging into the capacitance of the EL lamp load. With each high
frequency (HF) cycle, the voltage on the lamp is increased. At a period specified by the lamp frequency
(LF) oscillator, the voltage on the lamp is discharged to ground and the polarity of the inductive charging
is reversed. By this means, an alternating positive and negative voltage is developed at the single output
lead of the device to one of the electrodes of the EL lamp. The other lamp electrode is commonly
connected to a ground plane, which can then be considered as electrical shielding for any underlying
circuitry in the application.
The EL driving system is divided into several parts: on-chip logic and control, on-chip high voltage output
circuitry, discharge logic circuitry, and off-chip components. The on-chip logic controls the lamp operating
frequency (LF), as well as the inductor switching frequency (HF), and HF and LF duty cycles. These
signals are combined and buffered to regulate the high voltage output circuitry. The output circuitry
handles the power through the inductor and delivers the high voltage to the lamp. The integrated
discharge logic circuit enables the low-noise functionality of this EL driver with four levels of discharge
slopes on the output waveform. The selection of off-chip components provides a degree of flexibility to
accommodate various lamp sizes, system voltages, and brightness levels. Since a key objective for EL
driver systems is to save space and cost, required off-chip components are kept to a minimum.
Rogers provides a D371A IC Designer’s Kit, which includes a printed circuit evaluation board intended to
aid you in developing an EL lamp driver configuration that meets your requirements using the D371A IC.
A section on designing with the D371A IC is included in this datasheet to serve as a guide to help you
select the appropriate external components to complete your D371A EL driver system.
Typical D371A IC configurations for driving EL lamps in various applications are shown on the following
page. 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.
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 drivers for each application.
LIT-I9028 A13
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Reference D371A EL Driver Configurations
1 CHF
82k
Ω
GND
OFF
3.0V
ON
V+ 10
L+ 9
Vout 8
L- 7
D371A
N/C 6
1.0 u F
3.0V
3.0V Handset LCD
Typical Output
Luminance = 5.0 fL (17 cd/m )
Lamp Frequency = 330 Hz
Supply Current = 19 mA
Vout = 210 Vpp
Load: 1.5in
2
(950 mm
2
) DUREL 3 Green EL
2
68 pF
2 CLF
3300 pF
3 E
4 DCH
5 GND
1.5mH Murata LQS33C
1.5 in
2
EL Lamp
3.3V Handset LCD + Keypad
1 CHF
Typical Output
V+ 10
L+ 9
Vout 8
L- 7
D371A
+3.3 V
1.0 uF
68 pF
2
Luminance = 6.5 fL (22 cd/m )
Lamp Frequency = 270 Hz
Supply Current = 15 mA
Vout = 190 Vpp
Load: 2.4 in
2
(1550 mm
2
) DUREL 3 Green EL
2 CLF
3.9 nF
3.3V
OFF
GND
ON
3 E
4 DCH
5 GND
Bujeon BDS3516S
2.2 mH
N/C 6
2.4 in
2
EL Lamp
5.0V PDA
Typical Output
1 CHF
100 pF
Luminance = 5.5 fL (19 cd/m
2
)
Lamp Frequency = 285 Hz
Supply Current = 15 mA
Vout = 200 Vpp
Load: 4 in
2
(2580 mm
2
) DUREL 3 Green EL
V+ 10
L+ 9
Vout 8
L- 7
D371A
+5.0 V
1.0 uF
2 CLF
3.9 nF
5.0V
OFF ON
GND
3 E
4 DCH
5 GND
Coilcraft DS1608BL
4.7 mH
N/C
6
4 in
2
EL Lamp
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 drivers for each application.
LIT-I9028 A13
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