HV803X [SUPERTEX]
High-Voltage EL Lamp Driver; 高压EL灯驱动器
| 型号： | HV803X |
| 厂家： | 
Supertex, Inc |
| 描述： | High-Voltage EL Lamp Driver |
| 文件： | 总8页 (文件大小：82K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
HV803
High-Voltage EL Lamp Driver
Ordering Information
Package Options
8-Lead SO
HV803LG
Device
Input Voltage
Die
HV803
2.4V to 9.5V
HV803X
Features
General Description
Processed with HVCMOS® technology
2.4V to 9.5V operating supply voltage
DC to AC conversion
TheSupertexHV803isahigh-voltagedriverdesignedfordriving
EL lamps of up to 30nF. EL lamps greater than 30nF can be
driven for applications not requiring high brightness. The input
supplyvoltagerangeisfrom2.4to9.5V.Thedeviceusesasingle
inductor and a minimum number of passive components. The
nominal regulated output voltage that is applied to the EL lamp
is ±90V. The chip can be enabled by connecting the resistors on
RSW-osc and REL-osc to VDD and disabled when connected to GND.
180V peak-to-peak typical output voltage
Large output load capability typically 30nF
Short circuit protection on outputs
Adjustable output lamp frequency to control lamp color,
lamp life, and power consumption
The HV803 has two internal oscillators, a switching MOSFET,
and a high-voltage EL lamp driver. The frequency for the switch-
ing converter MOSFET is set by an external resistor connected
between the RSW-osc pin and the supply pin VDD. The EL lamp
driver frequency is set by an external resistor connected be-
tween REL-osc pin and the VDD pin. An external inductor is
connected between the Lx and VDD pins. A 0.01µF to 0.1µF
capacitor is connected between CS and GND pins. The EL lamp
is connected between VA and VB pins.
Adjustable converter frequency to eliminate harmonics and
optimize power consumption
Enable/disable function
Low current draw under no load condition
The switching MOSFET charges the external inductor and
discharges it into the Cs capacitor. The voltage at Cs will start to
increase. Once the voltage at Cs reaches a nominal value of 90V,
the switching MOSFET is turned OFF to conserve power. The
outputs VA and VB are configured as an H-bridge and are
switchedinoppositestatestoachieve180Vpeak-to-peakacross
the EL lamp.
Applications
Pagers
Cellular phones
Electronic personal organizers
GPS units
Handheld personal computers
Portable instrumentation
15
Pin Configuration
VDD
RSW-osc
Cs
REL-osc
VA
1
2
3
4
8
7
6
5
ςΑ
Absolute Maximum Ratings*
Supply Voltage, VDD
-0.5V to +10V
-0.5V to +120V
-25°C to +85°C
-65°C to +150°C
400mW
VB
Output Voltage, VCs
Lx
GND
Operating Temperature Range
Storage Temperature Range
Power Dissipation
SO-8
Note:
*All voltages are referenced to GND.
15-1
HV803
Electrical Characteristics
DC Characteristics (VIN = 3.0V, RSW = 750KΩ, REL = 2.0MΩ, TA = 25°C unless otherwise specified)
Symbol
RDS(on)
VCS
Parameter
Min
Typ
3.5
90
Max
8.0
100
200
2.0
100
300
500
35
Units
Conditions
On-resistance of switching transistor
Output voltage VCS Regulation
Output peak to peak voltage
Ω
I = 100mA
80
V
VIN = 2.4 to 9.5V
VIN = 2.4V to 9.5V
RSW-osc = GND
VA - VB
IDDQ
160
180
V
Quiescent VDD supply current, disabled
Input current going into the VDD pin
µA
µA
µA
µA
mA
V
IDD
VIN = 3.0V ±5%. See Figure 1.
VIN = 5.0V ±5%. See Figure 2.
V
IN = 9.0V ±5%. See Figure 3.
IIN
Input current including inductor current
Output voltage on VCS
VIN = 3.0V. See Figure 1.
VIN = 3.0V. See Figure 1.
VIN = 3.0V. See Figure 1.
VIN = 3.0V. See Figure 1.
VCS
fEL
fSW
D
45
300
50
70
VA-B output drive frequency
Switching transistor frequency
Switching transistor duty cycle
430
90
Hz
KHz
%
88
Recommended Operating Conditions
Symbol
VDD
Parameter
Min
2.4
-25
Typ
Max
Units
V
Conditions
Supply voltage
Operating temperature
9.5
85
TA
°C
Enable/Disable Table (See Figure 4)
RSW resistor
HV803
VDD
Enabled
GND
Disabled
15-2
HV803
Block Diagram
Lx
VDD
RSW-osc
GND
Cs
Switch
Osc
Q
Q
VA
+
_
C
Disable
Vref
Output
Osc
Q
Q
VB
REL-osc
Figure 1: Test Circuit, VIN = 3.0V (Low input current with moderate output brightness).
ON = VDD
OFF = 0V
2MΩ
VDD
REL-osc
VA
1
8
7
6
5
750KΩ
2.0KΩ
560µH1
RSW-osc
Cs
2
3
4
15
10nF
VB
VIN = 3.0V
1N4148
GND
Lx
Equivalent to 3 square inch lamp.
0.1µF2
0.1µF
100V
HV803
Note:
1. Murata part # LQH4N561K04 (DC resistance < 14.5Ω)
2. Larger values may be required depending upon supply impedance.
For additional information, see application note AN-H33.
15-3
HV803
Typical Performance Curves for Figure 1 using 3in2 EL Lamp.
V
CS vs. VIN
IIN vs. VIN
100
90
80
70
60
50
40
50
45
40
35
30
25
20
1
2
3
4
5
1
2
3
4
5
VIN (V)
VIN (V)
Brightness vs. VIN
IIN vs. VCS (V)
50
45
40
35
30
25
20
12
10
8
6
4
2
0
50
60
70
80
90
1
2
3
4
5
VIN (V)
VCS (V)
IIN, VCS, Brightness vs. Inductor Value
90
80
70
60
50
40
30
20
10
0
9.0
8.0
7.0
6.0
5.0
4.0
3.0
2.0
1.0
VCS (V)
Brightness (ft-Im)
IIN (mA)
0
100
250
400
550
700
850
1000
Inductor Value (µH)
15-4
HV803
Figure 2: Typical 5.0V Application*
ON = VDD
OFF = 0V
2MΩ
VDD
REL-osc
1
8
7
6
5
750KΩ
2.0KΩ
VA
560µH1
0.1µF2
RSW-osc
Cs
2
3
4
6 in2 lamp
VB
VIN = 5.0V
1N4148
GND
Lx
HV803
0.1µF
1nF
100V
Note:
1. Murata part # LQH4N561K04 (DC resistance < 14.5Ω)
2. Larger values may be required depending upon supply impedance.
For additional information, see application note AN-H33.
Typical Performance Curves for Figure 2
VCS vs. VIN
IIN vs. VIN
90
85
80
75
70
65
40
38
36
34
32
30
4
5
6
7
8
4
5
6
7
8
VIN (V)
VIN (V)
15
Brightness vs. VIN
IIN vs. VCS (V)
40
38
36
34
32
30
8
7.5
7
6.5
6
5.5
70
75
80
VCS (V)
85
90
4
5
6
IN (V)
7
8
V
15-5
HV803
Figure 3: Typical 9.0V Application*
2MΩ
VDD
REL-osc
1
8
7
6
5
330KΩ
560µH1
5.1KΩ
VA
RSW-osc
Cs
2
3
4
10 in2 lamp
VB
VIN
= 9.0V
1N4148
GND
Lx
0.1µF2
HV803
1nF
0.1µF
100V
Note:
1. Murata part # LQH4N561K04 (DC resistance < 14.5Ω)
2. Larger values may be required depending upon supply impedance.
For additional information, see application note AN-H33.
Typical Performance Curves for Figure 3
VCS vs. VIN
IIN vs. VIN
100
90
40
38
36
34
32
30
80
70
60
5.5
5.5
6.5
7.5
IN (V)
8.5
9.5
6.5
7.5
8.5
9.5
VIN (V)
V
Brightness vs. VIN
IIN vs. VCS (V)
40
38
36
34
32
30
6
5
4
3
2
1
65
70
75
80
85
90
95
5.5
6.5
7.5
8.5
9.5
VIN (V)
VCS (V)
15-6
HV803
External Component Description
External Component
Selection Guide Line
Diode
Fast reverse recovery diode, 1N4148 or equivalent.
Cs Capacitor
0.01µF to 0.1µF, 100V capacitor to GND is used to store the energy transferred from the inductor. 0.01µF is
recommended when driver has large EL lamps.
REL-osc
The EL lamp frequency is controlled via an external REL resistor connected between REL-osc and VDD of the
device. The lamp frequency increases as REL decreases. As the EL lamp frequency increases, the amount
of current drawn from the battery will increase and the output voltage VCS will decrease. The color of the EL
lamp is dependent upon its frequency.
A 2MΩ resistor would provide lamp frequency of 300 to 430Hz. Decreasing the REL-osc by a factor of 2, the
lamp frequency will increase by factor of 2.
RSW-osc
The switching frequency of the converter is controlled via an external resistor, RSW between RSW-osc and VDD
of the device. The switching frequency increases as RSW decreases. With a given inductor, as the switching
frequency increases, the amount of current drawn from the battery will decrease and the output voltage, VCS
will also decrease.
,
CSW Capacitor
Lx Inductor
A 1nF capacitor is required on RSW-osc pin to GND when the input voltage is equal to or greater than 5V.
As the input voltage of the device increases, a faster switching converter frequency is required to avoid
saturating the inductor. With the higher switching frequency, more noise will be introduced. This capacitor
is used to shunt any switching noise that may couple into the RSW-osc pin.
The inductor Lx is used to boost the low input voltage by inductive flyback. When the internal switch is on,
the inductor is being charged. When the internal switch is off, the charge stored in the inductor will be
transferredtothehighvoltagecapacitorCS. Theenergystoredinthecapacitoristhenavailabletotheinternal
H-bridge and therefore to the EL lamp. In general, smaller value inductors, which can handle more current,
are more suitable to drive larger size lamps. As the inductor value decreases, the switching frequency of the
inductor (controlled by RSW) should be increased to avoid saturation.
560µH Murata inductors with 14.5Ω series DC resistance is typically recommended. For inductors with the
sameinductancevaluebutwithlowerseriesDCresistance, lowerRSW valueisneededtopreventhighcurrent
draw and inductor saturation.
Lamp
As the EL lamp size increases, more current will be drawn from the battery to maintain high voltage across
the EL lamp. The input power, (VIN x IIN), will also increase. If the input power is greater than the power
dissipation of the package (350mW), an external resistor in series with one side of the lamp is recommended
to help reduce the package power dissipation.
Enable/Disable Configuration
TheHV803canbeeasilyenabledanddisabledviaalogiccontrol
signal on the RSW and REL resistors as shown in Figure 4 below.
The control signal can be from a microprocessor. RSW and REL
are typically very high values. Therefore, only 10’s of microam-
peres will be drawn from the logic signal when it is at a logic high
(enable) state. When the microprocessor signal is high the
device is enabled and when the signal is low, it is disabled.
Figure 4: Enable/Disable Configuration
15
ON =VDD
Enable
REL
OFF = 0V
VDD
REL-osc
VA
1
8
7
6
5
RSW
5.1KΩ
Lx
RSW-osc
Cs
2
EL Lamp
+
VB
3
4
VDD
1N4148
-
GND
Lx
0.1µF
HV803LG
CS
100V
1nF
15-7
HV803
Split Supply Configuration for Battery
Voltages of Higher than 9.5V
Split Supply Configuration Using a Single
Cell (1.5V) Battery
The HV803 can also be used for handheld devices operating
from a single cell 1.5V battery where a regulated voltage is
available. This is shown in Figure 5. The regulated voltage can
be used to run the internal logic of the HV803. The amount of
current necessary to run the internal logic is typically 30 to 60µA.
Therefore, theregulatedvoltagecouldeasilyprovidethecurrent
without being loaded down. The HV803 used in this configura-
tion can also be enabled/disabled via logic control signal on the
RSW and REL resistors as shown in Figure 4.
Figure5canalsobeusedwithhighbatteryvoltagessuchas12V
as long as the input voltage, VDD, to the HV803 device is within
its specifications of 2.4V to 9.5V.
Figure 5: Split Supply Configuration
ON
REL
VDD
Enable
OFF
GND
Regulated
Voltage
VDD
REL-osc
VA
1
8
7
6
5
RSW
RSW-osc
Cs
2
3
4
Lx
EL Lamp
+
-
VB
Battery
Voltage
1N4148
GND
Lx
0.1µF*
HV803LG
CS
100V
*Larger values may be required depending upon supply impedance.
For additional information, see application note AN-H33.
15-8
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