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HV833 High Voltage EL Lamp Driver
Features
1.8V to 6.5V operating supply voltage DC to AC conversion Separately adjustable lamp and converter frequency Output voltage regulation Enable/disable function Patented output timing for high efficiency <100nA shutdown current Split supply capability LCD backlighting
General Description
The Supertex HV833 is a high voltage driver designed for driving EL lamps of up to 35nF (10-12in2). The input supply voltage range is from 1.8V to 6.5V. The device uses a single 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/ disabled by connecting a resistor between the RSW-Osc pin and the VDD/GND pins. The HV833 has two internal oscillators, a switching MOSFET, and a high voltage EL lamp driver. The frequency for the switching MOSFET is set by an external resistor connected between the RSW-Osc pin and the VDD supply pin. The EL lamp driver frequency is set by an external resistor connected between the REL-Osc pin and the VDD pin. An external inductor is connected between the LX pin and VDD or VIN pin. A 0.0030.1F capacitor is connected between the CS pin and the GND pin. The EL lamp is connected between the VA pin and the VB pin. The switching MOSFET charges the external inductor and discharges it into the capacitor at CS. 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 switching in opposite states to achieve 180V peak-to-peak across the EL lamp.
Applications
Portable Transceivers Remote Control Units Calculators PDAs Global Positioning Systems (GPS)
Typical Application Circuit
ON = VDD OFF = 0 VDD Enable Signal
1 2 3 4
VDD
VA VB
8
EL Lamp
7 6
RSW-Osc REL-Osc GND
CS LX
1N914
5
VIN
+ _
HV833MG
LX
CS 100V
HV833
Ordering Information
Device HV833 Package Options MSOP-81 HV833MG HV833MG-G
-G indicates package is RoHS compliant (`Green')
Absolute Maximum Ratings
Parameter Supply voltage VDD Output voltage, VCS Operating Temperature Storage Temperature MSOP-8 Power Dissipation Value -0.5V to 7.5V -0.5V to 125V -40C to +85C -65C to +150C 300mW
Pin Configuration
VDD
1 2 3 4 8 7 6 5
VA VB
RSW-Osc REL-Osc GND
CS LX
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is not implied. Continuous operation of the device at the absolute rating level may affect device reliability. All voltages are referenced to device ground.
HV833MG
(Top View)
Recommended Operating Conditions
Symbol VDD fEL TA Parameter Supply voltage VA-B output drive frequency Operating Temperature Min 1.8 60 -25 Typ Max 6.5 1000 +85 Units V Hz C Conditions -------
DC Electrical Characteristics (Over recommended operating conditions unless otherwise specified, T =25C)
A
Symbol RDS(ON) VCS VA-B IDDQ IDD IIN VCS fEL FSW D
Parameter On-resistance of switching transistor Max. output regulation voltage Max differential output voltage across lamp Quiescent VDD supply current Input current going into the VDD pin Input current including inductor current Output voltage on VCS VDIFF output drive frequency Switching transistor frequency Switching transistor duty cycle
Min 80 160 63 240 55 -
Typ 90 180 56 72 270 65 88
Max 4.0 100 200 100 150 64 81 300 75 -
Units V V nA A mA V Hz kHz %
Conditions I = 100mA VDD = 1.8V to 6.5V VDD = 1.8V to 6.5V RSW-Osc = Low VDD = 1.8V to 6.5V. See Figure 1. VIN = 3.3V. See Figure 1. VIN = 3.3V. See Figure 1. VIN = 3.3V. See Figure 1. VIN = 3.3V. See Figure 1. See Figure 1.
Enable/Disable Function Table
Symbol EN-L EN-H Parameter Logic input low voltage Logic input high voltage Min 0 VDD - 0.5 Typ Max 0.5 VDD Units V V Conditions VDD = 1.8V to 6.5V VDD = 1.8V to 6.5V
2
HV833
Functional Block Diagram
VDD LX CS Switch Osc
Q
RSW-Osc
GND Disable
+ C _ VREF
VSEN
Q
VA
Output Osc
Q
REL-Osc
Q
VB
Fig. 1: Typical Application/Test Circuit
ON = VDD OFF = 0 VDD 1.0M
2 3
Enable Signal
1
VDD = VIN = 3.3V 680
VDD
VA VB
8
29nF
7 6
Equivalent to 10in2 lamp
RSW-Osc REL-Osc GND
CS LX
1.65M VIN
1N914
5
+ _
4
4.7F
HV833MG
LX* 220H
0.01F 100V
*LX = 220H Murata LQH43MN221K01
Typical Performance
Device HV833MG Lamp Size 10in2 VIN 3.3V IIN 56mA VCS 72V fEL 270Hz Brightness 5.0ft-Im TA -25OC to + 85OC
3
HV833
Typical Performance Curves for Fig. 1 (EL Lamp = 10.0in2, VIN = VDD)
IIN, VCS, Brightness vs. Inductor Value 80 70 60 IIN (mA), VCS (V) VCS 50 40 30 20 Brightness 10 0 100 1 0 1000 IIN 5 4 3 2 8 7 6 Brightness (ft-lm) 6.0
200
300
400
500
600
700
800
900
Inductor Value (H)
VCS vs. VIN 90 VCS (V) 80 70 60 50 40 1.0 2.0 3.0 4.0 VIN (V) Brightness vs. VIN 6 5 4 3 2 1 0 1.0 Brightness (ft-lm) 5.0 6.0 7.0 IIN (mA) 60 50 40 30 20 1.0 2.0 3.0
IIN vs. VIN
4.0 VIN (V) IIN vs. VCS
5.0
7.0
60 50 IIN (mA) 40 30 20 40 50 60
2.0
3.0
4.0 VIN (V)
5.0
6.0
7.0
70 VCS (V)
80
90
4
HV833
Fig. 2: Typical Application
ON = VDD OFF = 0 VDD 750K
2 3
Enable Signal
VDD =3.0V, VIN = 5.0V
1
VDD
VA 8 VB 7
EL Lamp 6.0in2
RSW-Osc REL-Osc GND
CS 6 LX
1N914
5
1.0M VIN
+ _
4
4.7F
HV833MG
LX* 560H
0.01F 100V
*LX = 560H Murata LQH43MN561K01
Typical Performance
Device HV833MG Lamp Size 6.0in
2
VIN 5.0V
IIN 30mA
VCS 70V
fEL 440Hz
Brightness 6.0ft-Im
O
TA -25 C to + 85OC
5
HV833
Typical Performance Curves for Fig. 2 (EL Lamp = 6.0in2, VDD = 3.0, VIN = 5.0V)
IIN, VCS, Brightness vs. Inductor Value 90 80 70 60 IIN (mA), VCS (V) 50 40 30 IIN 20 10 0 100 3 2 1 1000 Brightness VCS 10 9 8 7 6 5 4 Brightness (ft-lm) 6.0
200
300
400
500
600
700
800
900
Inductor Value (H)
VCS vs. VIN 80 70 60 50 40 30 20 1.0
IIN vs. VIN
VCS (V)
IIN (mA) 1.0
2.0
3.0
4.0 VIN (V)
5.0
6.0
7.0
2.0
3.0
4.0 VIN (V) IIN vs. VCS
5.0
7.0
Brightness vs. VIN Brightness (ft-lm) 10 8 6 4 2 0 1.0 2.0 3.0 4.0 VIN (V) 5.0 6.0 7.0 IIN (mA)
35 30 25 20 15 10 20 30 40 50 VCS (V) 60 70 80
6
HV833
Fig. 3: Typical Application
ON = VDD OFF = 0 Enable Signal
1
VDD = VIN = 3.0V
VDD
VA VB
8 7 6
750K
2
RSW-Osc REL-Osc GND
EL Lamp 3.0in2
+ VIN = VDD _
4.7F
3
CS LX
1.0M
4 5
1N914 L X* 560H 0.01F 100V
HV833MG
*LX = 560H Murata LQH43MN561K01
Typical Performance
Device HV833MG Lamp Size 3.0in
2
VIN 3.0V
IIN 20mA
VCS 60V
fEL 440Hz
Brightness 4.0ft-Im
O
TA -25 C to + 85OC
7
HV833
Typical Performance Curves for Fig. 3 (EL Lamp = 3.0in2, VIN = VDD)
90 80 70 IIN (mA), VCS (V) 60 VCS 50 40 30 20 IIN 10 0 100 2 1 1000 Brightness 6 5 4 3 IIN, VCS, Brightness vs. Inductor Value 10 9 8 7 Brightness (ft-lm) 6.0
200
300
400
500
600
700
800
900
Inductor Value (H)
VCS vs. VIN 90 80 70 60 50 40 30 1.0 25 IIN(mA) 20 15 10 5 1.0 2.0 3.0
IIN vs. VIN
VCS (V)
2.0
3.0
4.0 VIN (V)
5.0
6.0
7.0
4.0 VIN (V)
5.0
7.0
Brightness vs. VIN Brightness (ft-lm) 10 8 6 4 2 0 1.0 2.0 3.0 4.0 VIN (V) 5.0 6.0 7.0 IIN (mA)
25 20 15 10 5 30 40 50
IIN vs. VCS
60 VCS (V)
70
80
90
8
HV833
Enable/Disable Configuration
The HV833 can be easily enabled and disabled via a logic control signal on the RSW and REL resistors as shown in the Typical Application Circuit on the front page. The control signal can be from a microprocessor. RSW and REL are typically very high values. Therefore, only 10's of microamperes 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.
Enable/Disable Table
Enable Signal VDD 0V HV833 Enable Disable
Split Supply Configuration for Battery Voltages of Higher than 6.5V
The Typical Application Circuit on the first page can also be used with high battery voltages such as 12V as long as the input voltage, VDD, to the HV833 device is within its specifications of 1.8V to 6.5V. Split supply configuration is shown on Fig. 2.
External Component Description
External Component Diode CS Capacitor Selection Guide Line Fast reverse recovery diode, 100V 1N4148 or equivalent. 0.003F to 0.1F, 100V capacitor to GND is used to store the energy transferred from the inductor. The EL lamp frequency is controlled via an external REL resistor connected between REL-Osc and VDD pins 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. The switching frequency of the converter is controlled via an external resistor, RSW between RSW-Osc and VDD pins 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. 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 transferred to the high voltage capacitor CS. The energy stored in the capacitor is connected to the internal 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. A 220H Murata (LQH43MN221) inductor with 5.4 series DC resistance is typically recommended. For inductors with the same inductance value but with lower series DC resistance, a lower RSW value is needed to prevent high current draw and inductor saturation. 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 (300mW), an external resistor in series with one side of the lamp is recommended to help reduce the package power dissipation.
REL-Osc
RSW-Osc
LX Inductor
Lamp
9
HV833
8-Lead MSOP Package Outline (MG)
3x3mm body, 1.10mm height (max), 0.65mm pitch
D 8
1 (x4)
E E1
Note 1 (Index Area D1/2 x E1/2) L L2 Gauge Plane
1
L1
Seating Plane
Top View A
View B View B
A
A2
Seating Plane
A1
e
b
A
Side View
View A-A
Note 1: A Pin 1 identifier must be located in the index area indicated. The Pin 1 identifier may be either a mold, or an embedded metal or marked feature.
Symbol Dimension (mm) MIN NOM MAX
A 0.75 1.10
A1 0.00 0.15
A2 0.75 0.85 0.95
b 0.22 0.38
D 2.80 3.00 3.20
E 4.65 4.90 5.15
E1 2.80 3.00 3.20
e 0.65 BSC
L 0.40 0.60 0.80
L1 0.95 REF
L2 0.25 BSC
0 8
O
1 5O 15O
O
JEDEC Registration MO-187, Variation AA, Issue E, Dec. 2004. Drawings not to scale.
Doc.# DSFP-HV833 A040507
10

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