Durel Division
2225 W. Chandler Blvd.
Chandler, AZ 85224-6155
Tel: 480.917.6000 / FAX: 480.917.6049
www.rogerscorporation.com
Data Sheet
D365A Electroluminescent Lamp Driver IC
Features
Integrated Low Noise Circuitry
High AC Voltage Output
Circuit Topology Shields EMI
Drives up to 20in
2
EL Lamp
Capacitor or External Clock LF Control
Available in Lead-Free (Pb-free) and Green
MSOP-8 package
MSOP-8
Rogers DUREL® D365A 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. The D365A IC and
three components make a complete EL lamp
driving circuit. Equipped with a patented
discharge circuitry, the D365A IC device offers
low-noise performance in applications that are
sensitive to audible and electrical noise.
Applications
Cellular Phones and Handsets
Monochrome LCDs
Data Organizer / PDAs
Remote Controls
DFLX
TM
EL Keypad Lamps
Lamp Driver Specifications:
(Using Standard Test Circuit at Ta=25°C unless otherwise specified.)
Parameter
Standby Current
Supply Current
Enable Current
ON
OFF
Output Voltage
Lamp Frequency
Inductor Frequency
Symbol
I
Minimum
Typical
40
44
15
Vout
LF
HF
160
236
17
1mH
DCR = 2Ω
Maximum
1000
60
50
20
280
330
24
Units
nA
mA
uA
nA
Vpp
Hz
kHz
Conditions
E = GND
E = V+
E = V+
E=GND
E=V+
E=V+
E=V+
175
267
19.2
Standard Test Circuit
1 L+
MMBTA56
pnp SMT
3.3 V
L- 8
VOUT 7
GND 6
D365A
Load “B”
2 BASE
3 CHF
6.8 nF
0.1
µ
F 3.3 V
4 V+
E 5
OFF
ON
LIT-I9035 Rev A05
Page 1 of 13
Load B*
47 nF
100
Ω
10k
Ω
* Load B approximates a 5in
2
(32.3cm
2
) EL lamp.
Typical Output Waveform
22 nF
Absolute Maximum Ratings:
Parameter
Supply voltage
Operating Range
Withstand Range
Enable voltage
Lamp Output Voltage
Power Dissipation
Operating Temperature
Storage temperature
Symbol
V+
E
V
peak
Pd
T
a
T
s
Minimum
2.5
-0.5
-0.5
Maximum
6.5
7.0
(V+) + 0.5
140
250
85
150
Unit
V
V
V
mW
°C
°C
Positive peak Voltage
Comments
E = V+
E = GND
-20
-65
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
NAME
L+
Base
CHF
V+
E
GND
Vout
L-
FUNCTION
Positive input to inductor
PNP transistor base connection
High Frequency oscillator capacitor/clock input
DC power supply input
System enable; HI=On
System ground connection
AC output to Lamp
Negative input to inductor
1
2
3
4
8
7
6
5
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Typical Performance Characteristics Using Standard Test Circuit
400
350
300
250
200
150
100
50
0
2
3
4
5
6
7
DC Input Voltage (V)
L F (H z )
L F (H z )
400
350
300
250
200
150
100
50
0
-20
0
20
40
60
80
Temperature (ºC)
Output Frequency vs. DC Supply Voltage
280
O u t p u t V o lta g e (V p p )
Output Frequency vs. Ambient Temperature
280
O u t p u t V o lt a g e (V p p )
240
200
160
120
80
40
0
2
3
4
5
6
7
DC Input Voltage (V)
240
200
160
120
80
40
0
-20
0
20
40
60
80
Temperature (ºC)
Output Voltage vs. DC Supply Voltage
Output Voltage vs. Ambient Temperature
70
A v g S u p p ly C u rre n t (m A )
70
A v g S u p p ly C u rre n t (m A )
60
50
40
30
20
10
0
2
3
4
5
6
7
DC Input Voltage (V)
60
50
40
30
20
10
0
-20
0
20
40
60
80
Temperature (ºC)
Supply Current vs. DC Supply Voltage
Supply Current vs. Ambient Temperature
LIT-I9035 Rev A05
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Block Diagram of the Inverter Circuitry
≥
0.1
µ
F
V+
E
ON
OFF
V+
Base
Divide by 72
L+
Discharger
CHF
High Frequency
Oscillator
L-
VOUT
GND
EL Lamp
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 D365A 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) charging cycle the voltage on the lamp is increased. After 32 HF charging cycles, the
lamp voltage is discharged to ground in the period of 4 HF cycles. Then, the polarity of the inductive
charging is reversed, and the charging and discharging cycles are repeated. By this means, a low
frequency (LF) alternating positive and negative voltage is developed at the single output lead of the
device to one of the electrodes of the EL lamp. Commonly connected to ground, the other lamp electrode
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 the HF and LF duty cycles. These
signals are combined and buffered to drive 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. 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 of EL driver systems is to save space and cost, required off-chip components are kept to
a minimum.
Rogers also provides a D365A IC Designer’s Kit, which includes a PC board intended to aid you in
developing an EL lamp driver configuration that meets your requirements using the D365A IC. A section
on designing with the D365A IC is included in this datasheet to serve as a guide to help you select the
appropriate external components to complete your D365A EL driver system.
Typical D365A 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 circuit configurations are also shown with each respective figure.
LIT-I9035 Rev A05
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Typical D365A EL Driver Configurations
4.7 mH
Coilcraft
DS1608BL-475
3.3V Handset LCD
Typical Output
Luminance = 5.2 fL (17.8 cd/m
2
)
Lamp Frequency = 278 Hz
Supply Current = 17 mA
Vout = 186 Vpp
Load: 2 in
2
(12.90 cm
2
) DUREL 3 Green EL
6.8 nF
0.1
µ
F 3.3 V
1 L+
MMBTA56
pnp SMT
3.3 V
L-
8
2 in
2
EL Lamp
2
BASE
VOUT 7
GND
6
5
OFF
ON
3 CHF
4
V+
D365A
D365
E
3.3V Handset LCD + Keypad
Typical Output
Luminance = 6.7 fL (23.0 cd/m )
Lamp Frequency = 259 Hz
Supply Current = 56 mA
Vout = 204 Vpp
Load: 4 in
2
(25.80 cm
2
) DUREL 3 Green EL
2
1.5 mH
Sumida
CLS62-152
MMBTA56
pnp SMT
3.3 V
18 kHz CLK, 25% Duty
1 L+
2
BASE
L- 8
VOUT 7
GND
D365A
D365
4 in
2
EL Lamp
3 CHF
4 V+
6
ON
OFF
E 5
0.1
µ
F 3.3 V
5.0V LCD Backlight
Typical Output
2.2 mH
Bujeon
BDS-4020S
Luminance = 7.1 fL (24.3 cd/m )
Lamp Frequency = 353 Hz
Supply Current = 34 mA
Vout = 190 Vpp
Load: 6 in
2
(38.71 cm
2
) DUREL 3 Green EL
2
1 L+
MMBTA56
pnp SMT
5.0 V
L-
8
6 in
2
EL Lamp
2
BASE
VOUT 7
GND
E
6
5
OFF
ON
3 CHF
6.8 nF
1.0
µ
F 5.0 V
4
V+
D365A
D365
LIT-I9035 Rev A05
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