D381A [ETC]
Electroluminescent Lamp Driver IC; 电致发光灯驱动器IC
| 型号： | D381A |
| 厂家： | 
ETC |
| 描述： | Electroluminescent Lamp Driver IC |
| 文件： | 总15页 (文件大小：370K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Data Sheet
D381A
Electroluminescent
Lamp Driver IC
General Description:
The Durel D381A is part of a family of highly integrated EL
drivers based on Durel’s 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.
D381A
MSOP-8
MSOP-10
Features
Applications
• Flexible Wave Shaping Capability
• HighEfficiency
• Cellular Phones and Handsets
• Data Organizers/PDAs
• ExternalClockCompatible
• HighVoltageACOutput
• High Performance with Low-profile Coils
•LCD and Keypad Backlighting
Lamp Driver Specifications:
(Using Standard Test Circuit at Ta=25 °C unless otherwise specified.)
Parameter
Symbol
Minimum
Typical
Maximum
Unit
Conditions
E = GND
E = 3.0V
E = 3.0V
Standby Current
Supply Current
Enable Current
Output Voltage
0.04
43
1
uA
I
mA
uA
40
158
230
17
50
60
206
310
23
Vout
LF
HF
182
270
20
Vpp
Hz
Lamp Frequency
Inductor Frequency
CLF=10 nF
CHF=220 pF
kHz
Standard Test Circuit
220 pF
+3.3 V
CHF
1
10
9
V+
L+
10 nF
0.1
F
µ
CLF
2
3.0V
ON
E
3
8
Vout
L-
0.68mH /
1.7 Ohms DCR
GND
OFF
4 N/C
7
6
5 GND
N/C
D381A
Load B
1
Typical Output Waveform
Load B*
47 nF
22 nF
100
Ω
10k
Ω
* Load B approximates a 5in2 EL lamp.
Absolute Maximum Ratings:
Parameter
Symbol
Minimum
Maximum
Unit
Comments
Supply voltage
Operating Range
V+
2.0
-0.4
-0.4
7.0
7.0
V
E = V+
E = GND
Withstand Range
Enable Voltage
E
VOUT
VCHF
VCLF
Ta
V+
V
Vpp
V
Output Voltage
220
Peak-to-peak voltage
External clock input
External clock input
CHF Voltage
0
0
-40
-55
100
(V+) +0.3
(V+) +0.3
85
CLF Voltage
V
Operating Temperature
Storage Temperature
Lamp Resistance
°C
Ts
Rlamp
150
°C
Ω
Note: The above are 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:
PIN # NAME
FUNCTION
1
2
3
4
8
1
2
3
4
5
6
7
8
CHF
CLF
E
High frequency oscillator capacitor/clock input
Lamp frequency capacitor/clock input
System enable: Wave-shaping resistor control
System ground connection
7
GND
L-
Negative input to inductor
6
5
VOUT
L+
V+
High voltage AC output to lamp
Positive input to inductor
DC power supply input
PIN # NAME
FUNCTION
1
10
1
CHF
CLF
E
High frequency oscillator capacitor/clock input
2
Lamp frequency capacitor/clock input
System enable: Wave-shaping resistor control
2
3
4
5
9
8
7
6
3
4
N/C
GND
N/C
L-
5
System ground connection
6
7
Negative input to inductor
8
VOUT High voltage AC output to lamp
L+
9
Positive input to inductor
DC power supply input
10
V+
2
Typical Performance Characteristics
400
350
300
250
200
150
100
50
400
350
300
250
200
150
100
50
0
0
2
3
4
5
6
7
-40 -20
0
20
40
60
80
80
80
Temperature ( C)
DC Input Voltage
°
Output Frequency vs. DC Supply
Voltage
Output Frequency vs. Ambient
Temperature
240
200
160
120
80
280
240
200
160
120
80
Vout (max)=220Vpp
40
40
0
0
-40 -20
0
20
40
60
2
3
4
5
6
7
°
Temperature ( C)
DC Input Voltage
Output Voltage vs. Ambient
Temperature
Output Voltage vs. DC Supply Voltage
40
30
20
10
0
70
60
50
40
30
20
10
0
-40
-20
0
20
40
60
2
3
4
5
6
7
Temperature ( C)
°
DC Input Voltage
Supply Current vs. DC Supply
Voltage
Supply Current vs. Ambient
Temperature
3
Block Diagram of the Driver Circuitry
CLF
CHF
E
Theory of Operation
Electroluminescent (EL) lamps are essentially capacitors with one transparent electrode and a special phosphor material
in the dielectric. When a strong AC voltage is applied across the EL lamp electrodes, the phosphor glows. The
required AC voltage is typically not present in most systems and must be generated from a low voltage DC source.
Thus, Durel 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. The Durel 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 D381A 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 on 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 output 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 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 were kept to a minimum.
Durel provides a D381A Designer’s Kit, which includes a printed circuit evaluation board intended to aid you in
developing an EL lamp driver configuration using the D381A that meets your requirements. A section on designing
with the D381A is included in this datasheet to serve as a guide to help you select the appropriate external components
to complete your D381A EL driver system.
Typical D381A 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.
4
Typical D381A EL Driver Configurations
3.0V Handset LCD
82kΩ
3.0V
ON
GND
OFF
Typical Output
CHF
CLF
10
9
1
2
3
3.0V
V+
L+
Luminance= 9.7 fL (33.2 cd/m2)
68 pF
1.0
F
µ
Lamp Frequency = 392 Hz
6.8 nF
Supply Current = 15 mA
E
8
7
6
Vout
L-
.68mH Murata LQH4N
Vout = 210 Vpp
4 N/C
Load = 1.5 in2 (950 mm2)Durel Green EL
5
GND
N/C
D381A
1.5 in2 EL Lamp
3.3V Handset LCD and Keypad
Ω
3.0V
ON
82k
GND
OFF
1
2
3
4
5
10
Typical Output
CHF
CLF
V+
L+
68 pF
1.0 uF
Luminance = 6.9 fL (23.6 cd/m2)
9
8
7
6
Lamp Frequency = 266 Hz
10 nF
Supply Current = 13 mA
1mH Sumida CLS62
E
Vout
L-
Vout = 200 Vpp
N/C
Load = 2.25in2 (1550 mm2) Durel Green EL
GND
N/C
D381A
2.25 in2
EL Lamp
5.0V PDA
+5.0 V
1.0 uF
1
10
9
CHF
CLF
V+
L+
68 pF
2
3
4
5
Typical Output
1.0 nF
Luminance = 7.1 fL (24.35 cd/m2)
5.0V
8
Bujeon BDS4020S
1.5 mH
E
Vout
L-
ON
OFF
GND
Lamp Frequency = 280 Hz
7
N/C
Supply Current = 18 mA
Vout = 211 Vpp
6
GND
N/C
D381A
4 in2
Load = 4 in2 (2580 mm2) Durel Green EL
EL Lamp
5
Designing With D381A
I. Lamp Frequency Capacitor (CLF) Selection
Selecting the appropriate value of lamp frequency capacitor (CLF) for the low frequency oscillator will specify the
output frequency of the D381A EL driver. Lamp frequencies of 200-500 Hz are typically used. Figure 1 graphically
represents the inversely proportional relationship between the CLF capacitor value and the oscillator frequency.
900
800
700
600
500
400
300
200
100
0
0
5
10
15
20
25
30
CLF (nF)
Figure 1: Typical Lamp Frequency vs. CLF Capacitor
Alternatively, the lamp frequency may also be controlled with an external clock signal. There is an internal frequency
divider in the device so that the output lamp frequency will be half of the input clock signal. For example, if a 500Hz
inputclocksignalisused, theresultinglampfrequencywillbe250Hz. Theclocksignalinputvoltageshouldnotexceed
V+.
The selection of the CLF value can also affect the brightness of the EL lamp because of its control of the lamp frequency
(LF). Although input voltage and lamp size can change EL lamp frequency as well, LF mainly depends on the CLF
value selected or the frequency of the input clock signal to CLF. Figure 2 shows typical brightness of a D381A circuit
with respect to lamp frequency. In this example, the inductor and CHF values were kept constant while varying LF.
7
6
5
4
3
2
1
0
0
200
400
600
800
1000
1200
Lamp Frequency (Hz)
Figure 2: Luminance vs. Lamp Frequency
(V+=3.0V, 2.4in2 Durel3GreenELLampLoad)
6
II. High Frequency Capacitor (CHF) Selection
Selecting the appropriate value of capacitor for the high frequency oscillator (CHF) will set the inductor switching
frequency of the D381A IC. High inductor frequency allows for more efficient use of inductor coils with lower values.
However, care must be taken that the charge pumping does not reach a continuous mode at very high frequency when
the voltage is not efficiently transferred to the lamp load. Figure 3 graphically represents the effect of the CHF value
on the oscillator frequency at V+=3.0V.
100
80
60
40
20
0
0
25 50 75 100 125 150 175 200 225 250 275 300
CHF (pF)
Figure 3: Typical InductorFrequency vs. CHF Capacitor
The inductor switching frequency may also be controlled with an external clock signal. The inductor will charge during
the low portion of the clock signal and discharge into the EL lamp during the high portion of the clock signal. The
positive duty cycle used for the external high frequency clock signal is usually between 15%-75%, with a typical value
of 15%-20% for maximum brightness. The clock signal input voltage should not exceed V+.
7
III. Inductor (L) Selection
The inductor value and inductor switching frequency have the greatest impact on the output brightness and current
consumption of the EL driver. Figures 4 and 5 show the dependence of brightness and current draw of a D381A circuit
on coil values and CHF values for two sample EL lamps sizes and input voltages. The CLF value was chosen such that
theoutputvoltagedidnotexceed220Vpp. PleasenotethattheDCresistance(DCR)ofinductorswiththesamenominal
inductance value may vary with manufacturer and inductor type. Thus, inductors made by a different manufacturer
may yield different outputs, but the trend of the different curves should be similar.
16
14
12
10
8
80
70
60
50
40
30
20
10
0
6
4
68 pF Brightness
100 pF Brightness
68 pF Current
2
100 pF Current
0
0.15
0.22
0.33
0.39
0.47
0.56
0.68
0.82
1.00
1.20
1.50
1.80
2.20
Inductor (mH)
Figure 4: Brightness and current vs. inductor and CHF value
(Conditions: V+=3.0V, 2in2 EL Lamp)
16
60
14
12
10
8
50
40
30
20
10
0
6
4
68 pF Brightness
100 pF Brightness
68 pF Current
2
100 pF Current
0
0.68
0.82
1
1.2
1.5
1.8
2.2
2.7
3.3
Inductor (mH)
Figure 5: Brightness and current vs. inductor and CHF value
(Conditions: V+=5.0V, 4in2 EL Lamp)
8
IV. Wave-Shape Selection
The D381A driver IC uses a patented wave-shaping technique for reducing audible noise from an EL lamp. The linear
discharge of the output waveform may be adjusted by selecting a proper value for the wave-shaping resistor (Rena) to
the E pin. The optimal discharge level for an application depends on the lamp size, lamp brightness, and application
conditions. To ensure that the D381A is configured optimally, various discharge levels should be evaluated. In many
cases, the lower discharge levels result in lower audible noise from the EL lamp.
D381 Discharge Control
12.00
10.00
8.00
6.00
4.00
2.00
0.00
0.0
20.0
40.0
60.0
80.0
100.0
Rena (KOhm)
Figure 6: Rena selection for discharge control (CLOAD=15nF), (E= 3V)
Typical waveshapes corresponding to the various discharge levels for a 4in2 lamp are shown below. The waveshape
with the smoothest transition slope in the discharge portion of the waveform yields the lowest audible noise.
Rena=82kΩ
Rena=0Ω
9
D381A Design Ideas
I. Driving Multi-segment Lamps
The D381A may be used to drive multiple EL lamp segments. An external transistor switching circuit is used to turn
each lamp segment on or off independently or simultaneously. A high signal at the corresponding E input will enable
the corresponding lamp segment. In this configuration, EL Lamp 1 is always turned on when the IC is enabled.
Otherwise, always make sure that at least one segment is selected when the D381A is enabled.
Vbat
1
2
3
4
5
10
9
CHF
CLF
V+
L+
0.1 uF
ON
8
E1
Vout
L-
OFF
7
N/C
6
GND
N/C
D381A
EL Lamp 1
EL Lamp 2
EL Lamp 3
ON
ON
BAS21LT1
BAS21LT1
E2
4.7K
BAS21LT1
BAS21LT1
E3
4.7K
OFF
OFF
2.2K
2.2K
MMBT5551LT1
MMBT5401LT1
MMBT5551LT1
MMBT5401LT1
1K
100 nF
100 nF
1K
II. Two-Level Dimming
Two level dimming may be achieved with the circuit below. When DIM is low, the external PNP transistor is saturated
and the EL lamp runs at full brightness. When DIM is high, the external PNP turns off and the 47Ωresistor reduces the
voltageat(V+)anddimstheELlamp.
Renable
ON
VENA
OFF
1
2
3
4
5
10
9
CHF
CLF
V+
L+
1.0 uF
CHF
1kΩ
Rswitch
DIM
CLF
L
8
E
Vout
L-
3V
2N3906
DIM
BRIGHT
0V
7
N/C
Vbat
6
GND
N/C
D381A
EL
Lamp
10
III. Lamp Frequency Control with an External Clock Signal
An external clock signal may be used to control the EL lamp frequency (LF) of the D381A instead of using a capacitor.
There is an internal frequency divider in the IC so that the output lamp frequency will be half of the input clock signal.
Forexample, ifa500Hzinputclocksignalisused, theresultinglampfrequencywillbe250Hz. Theclocksignalvoltage
should not exceed V+. A typical duty cycle for the clock input is +50%.
Vbat
1
2
3
4
5
10
9
CHF
CLF
V+
L+
0.1 uF
1.0V Min
0.2V Max
200Hz - 2KHz
ON
8
E
Vout
L-
OFF
7
N/C
6
GND
N/C
D381A
EL Lamp
IV. EL Brightness through HF Clock Pulse Width Modulation
The inductor oscillating frequency may also be controlled on the D381A EL driver IC using an external clock input to
CHF. In addition, pulse-width modulation of the external HF clock signal to the D381A may be used to regulate the
brightness of the EL lamp load. High frequency input is typically in the range of 10kHz to 40kHz, with duty cycle in the
range of 15% to 100%. In general, a lower HF frequency results in higher brightness and using a lower duty cycle
results in higher brightness. The clock signal voltage should not exceed V+. Prior to finalization of the circuit, contact
Durel to verify that the frequency, duty cycle, and setup chosen are acceptable for EL driver performance.
10KHz - 40KHz
15%-75% Duty
1.0V Min
Vbat
1
2
3
4
5
10
9
CHF
CLF
V+
L+
0.2V Max
0.1 uF
ON
8
E
Vout
L-
OFF
7
N/C
6
GND
N/C
D381A
EL Lamp
11
V. EL Lamp Brightness Regulation
Regulating the DC supply input voltage to the D381A will result in a constant brightness level from the EL lamp,
regardless of battery voltage. In this example, a Micrel voltage regulator is used.
OUT
IN
4
3
1
2
GND
E
E
MIC5203
Vbat
1
2
3
4
5
10
9
CHF
V+
0.1 uF
CLF
E
L+
Vout
L-
ON
8
OFF
7
N/C
6
GND
N/C
D381A
EL Lamp
VI. Output Voltage Limit Control
An EL driver system using the D381A driver IC should be designed such that the output voltage does not exceed the
maximum rated value of 220Vpp. A pair of zener diodes connected to the output as shown below is recommended to
limitVouttowithin200Vpporless. Thiscircuitprotectsthedevicefromover-voltagewhentypicalperformanceisnear
themaximumlimitfortheD381A.
ON
Renable
OFF
VBAT
1
2
3
4
5
10
9
CHF
CLF
V+
L+
CHF
1.0 uF
CLF
L
8
E
Vout
L-
7
N/C
6
GND
N/C
D381A
1N5271 or
equivalent
100V zener
diodes
EL
Lamp
12
Ordering Information
TheD381AICisavailableinstandardMSOP-8orMSOP-10plasticpackagetapeandreel. ADurelD381ADesigner’s
Kit (1DDD381AA-K01) provides a vehicle for evaluating and identifying the optimum component values for any
particular application using D381A. Durel engineers also provide full support to customers, including specialized
circuitoptimizationandapplicationretrofits.
MSOP-8
F
Min.
Typical
Max.
Description
mm.
in.
mm.
in.
mm.
in.
A
B
C
D
E
F
G
H
I
0.94
0.05
0.20
0.41
0.13
2.84
0.43
4.70
2.84
0.037
0.002
0.008
0.016
0.005
0.112
0.017
0.185
0.112
1.02
0.10
0.33
0.53
0.18
3.00
0.65
4.90
3.00
0.040
0.004
0.013
0.021
0.007
0.118
0.026
0.193
0.118
1.09
0.15
0.46
0.65
0.23
3.15
0.83
5.11
3.25
0.043
0.006
0.018
0.026
0.009
0.124
0.033
0.201
0.128
I
H
D
E
C
A
B
G
MSOPsaremarkedwithpartnumber(381A),5-digitwaferlotcodeanda3-digitdate
code.BottomofmarkingisonthePin1side.
MSOP-10
F
Min.
Typical
Max.
mm.
in.
mm.
in.
mm.
in.
A
B
C
D
E
F
G
H
I
0.92
0.05
0.15
0.40
0.13
2.90
0.35
4.75
2.90
0.036
0.002
0.006
0.016
0.005
0.114
0.014
0.187
0.114
1.00
0.10
0.23
0.55
0.18
3.00
0.50
4.90
3.00
0.039
0.004
0.009
0.022
0.007
0.118
0.020
0.193
0.118
1.08
0.043
0.006
0.012
0.028
0.009
0.122
0.026
0.199
0.122
I
0.15
0.31
0.70
0.23
3.10
0.65
5.05
3.10
H
D
E
C
A
B
G
MSOPsaremarkedwithpartnumber(381A),5-digitwaferlotcodeanda3-digitdate
code.BottomofmarkingisonthePin1side.
MSOPs in Tape and Reel:
MSOP-8: 1DDD381AA-M02
MSOP-10: 1DDD381AA-M04
Tape Orientation
Embossed tape on 360 mm diameter per reel.
2500 units per reel.
13
RECOMMENDED PAD LAYOUT
b
a
MSOP-8 PAD LAYOUT
Min.
Typical
Max.
mm.
in.
mm.
in.
mm.
in.
a
b
c
d
e
f
0.60
0.0236
0.0748
0.130
0.035
0.207
0.016
0.6
1.9
0.0256
0.0768
0.70
0.0276
0.0788
0.136
0.041
0.213
0.020
c
e
1.90
3.3
2.00
3.45
1.05
5.41
0.51
0.89
5.26
0.41
0.9
0.4
0.038
0.018
d
f
b
a
MSOP-10 PAD LAYOUT
Min.
Typical
Max.
mm.
in.
mm.
in.
mm.
in.
c
e
a
0.5
2.0
0.0197
0.0788
b
c
d
e
f
3.3
0.89
5.26
0.130
0.035
0.207
3.45
1.05
5.41
0.136
0.041
0.213
d
0.97
0.3
0.038
0.012
f
ISO 9001 Certified
DUREL Corporation
2225 W. Chandler Blvd.
Chandler,AZ 85224-6155
Tel: (480) 917-6000
FAX: (480) 917-6049
Website: http://www.durel.com
The DUREL name and logo are registered trademarks of DUREL CORPORATION.
This information is not intended to and does not create any warranties, express or implied, including any warranty of merchantability or fitness for a
particular purpose. The relative merits of materials for a specific application should be determined by your evaluation.
This driver is covered by the following U.S. patents: #5,313,141, #5,347,198; #5,789,870 #6,043,610. Corresponding foreign patents are issued and pending.
© 2001, 2002 Durel Corporation
Printed in U.S.A.
LIT-I 9040 Rev. A03
14
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