View HV833_657757.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

HV833
HV833
Demo Kit Available
High Voltage EL Lamp Driver
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 the resistor on RSW-OSC to VDD/ground. 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 supply pin VDD. The EL lamp driver frequency is set by an external resistor connected between REL-osc pin and the VDD pin. An external inductor is connected between the LX and VDD or VIN pins. A 0.003-0.1F capacitor is connected between CS and ground. The EL lamp is connected between VA and VB. 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.
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
Applications
Portable Transceivers Remote Control Units Calculators PDAs Global Positioning Systems (GPS)
Typical Application
ON=VDD OFF=0 VDD Enable Signal
1 VDD 2 RSW-osc
VA VB
8
EL Lamp
7
+
VIN
_
3 REL-osc 4 Gnd
CS 6 1N914 LX 5 LX
HV833MG
Cs 100V
05/02/02
Supertex Inc. does not recommend the use of its products in life support applications and will not knowingly sell its products for use in such applications unless it receives an adequate "products liability indemnification insurance agreement." Supertex does not assume responsibility for use of devices described and limits its liability to the replacement of devices determined to be defective due to workmanship. No responsibility is assumed for possible omissions or inaccuracies. Circuitry and specifications are subject to change without notice. For the latest product specifications, refer to the Supertex website: http://www.supertex.com. For complete liability information on all Supertex products, refer to the most current databook or to the Legal/Disclaimer page on the Supertex website. 1
HV833
Ordering Information
Package Options Device HV833 MSOP-8 HV833MG* Die HV833X
Pin Configuration
VDD RSW-osc REL-osc Gnd
1 2 3 4
8 7
VA VB CS LX
* Product supplied on 2500 piece carrier tape reels.
MSOP-8
6 5
Absolute Maximum Ratings*
Supply Voltage, VDD Output Voltage, VCs Operating Temperature Range Storage Temperature Range MSOP-8 Power Dissipation
Note: *All voltages are referenced to GND.
-0.5V to +7.5V -0.5V to +100V -25 to +85C -65C to +150C 300mW
Top View
Enable/Disable Table
(See Typical Application on Front Page)
RSW resistor VDD 0V HV833 Enable Disable
Electrical Characteristics
DC Characteristics (Over recommended operating conditions unless otherwise specified, TA=25C)
Symbol RDS(on) VCs VA-B IDDQ IDD IIN VCS fEL fSW D Parameter On-resistance of switching transistor Max. output regulation voltage Max. of 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 VA-B output drive frequency Switching transistor frequency Switching transistor duty cycle 63 240 55 56 72 270 65 88 80 160 90 180 Min Typ Max 4.0 100 200 100 150 64 81 300 75 Units V V nA A mA V Hz KHz % 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. Conditions
Recommended Operating Conditions
Symbol VDD fEL TA Supply voltage VA-B output drive frequency Operating temperature Parameter Min 1.8 60 -25 Typ Max 6.5 1000 85 Units V Hz C Conditions
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
Block Diagram
LX VDD CS RSW-OSC Switch Osc
Q
GND Disable
+ C _ Vref
Vsen
Q
VA
Output Osc
Q
REL-OSC
Q
VB
Figure 1: Typical Application
Equivalent to 10in2 lamp 680 VDD 1.0M
ON=VDD OFF=0
Enable Signal
VDD=VIN=3.3V
1 VDD 2 RSW-osc
VA VB
8
29nF
7
VIN
+ _
4.7F
3 REL-osc
1.65M
CS 6 LX 5 1N914 LX* 220H
4 Gnd
HV833MG
0.01F 100V
* Lx = 220H Murata LQH43MN221K01
Typical Performance
Device HV833MG Lamp Size 10 in2 VIN 3.3V IIN 56mA VCS 72V fEL 270Hz Brightness 5.0ft-lm TA -25C to +85C
3
HV833
Typical Performance Curves for Figure 1 (EL Lamp= 10.0 in2, VIN=VDD).
Vcs vs. Vin 90 Vcs (V) 80 70 60 50 40 1.0 2.0 3.0 4.0 Vin (V) 5.0 6.0 7.0 Iin(mA) 60 50 40 30 20 1.0 2.0 3.0 4.0 Vin (V) 5.0 6.0 7.0 Iin vs. Vin
Brightness vs. Vin 6 5 4 3 2 1 0 1.0 60 50 Iin (mA) 40 30 20 2.0 3.0 4.0 Vin (V) 5.0 6.0 7.0 40 50 60 Brightness (ft-lm)
Iin vs. Vcs
70 Vcs (V)
80
90
Iin, Vcs, Brightness vs. Inductor Value 80 70 60 Vcs 8 7 6 5 4 Iin 3 2 Brightness 10 0 100 1 0 1000
Iin (mA), Vcs (V)
50 40 30 20
200
300
400
500
600
700
800
900
Inductor Value (H)
4
Brightness (ft-lm)
HV833
Figure 2: Typical Application
Figure 2: VDD=3V, VIN=5.0V ON=VDD OFF=0 VDD 750K Enable Signal
1 VDD 2 RSW-osc
VA VB
8 7
EL Lamp 6in2
VIN
+ _
4.7F
3 REL-osc
1.0M
CS 6 LX 5 1N914 LX* 560H
4 Gnd
HV833MG
0.01F 100V
* Lx = 560H Murata LQH43MN561K01
Typical Performance
Device HV833MG Lamp Size 6.0 in2 VIN 5.0V IIN 30mA VCS 70V fEL 440Hz Brightness 6.0ft-lm TA -25C to +85C
5
HV833
Typical Performance Curves for Figure 2 (EL Lamp= 6.0 in2, VDD=3.0V).
80 70 60 50 40 30 20 1.0 Vcs vs. Vin Iin vs. Vin
Vcs (V)
Iin(mA)
2.0
3.0
4.0 Vin (V)
5.0
6.0
7.0
1.0
2.0
3.0
4.0 Vin (V)
5.0
6.0
7.0
Brightness vs. Vin
Brightness (ft-lm)
Iin vs. Vcs 35 30
Iin (mA)
10 8 6 4 2 0 1.0 2.0 3.0 4.0 Vin (V) 5.0 6.0 7.0
25 20 15 10 20 30 40 50 Vcs (V) 60 70 80
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)
200
300
400
500
600
700
800
900
Inductor Value (H)
6
HV833
Figure 3: Typical Application
Figure 3: VDD = VIN = 3.0V ON=VDD OFF=0 Enable Signal
1 VDD
750K
VA VB
8 7
EL Lamp 3in2
2
RSW-osc
+ VIN=VDD _
4.7F
3 REL-osc
1.0M
CS 6 LX 5 1N914 LX* 560H
4 Gnd
HV833MG
0.01F 100V
* Lx = 560H Murata LQH43MN561K01
Typical Performance
Device HV833MG Lamp Size 3.0 in2 VIN 3.0V IIN 20mA VCS 60V fEL 440Hz Brightness 4.0ft-lm TA -25C to +85C
7
HV833
Typical Performance Curves for Figure 3 (EL Lamp= 3.0 in2, VIN=VDD).
Vcs vs. Vin 90 80 70 60 50 40 30 1.0 25
Iin(mA)
Iin vs. Vin 20 15 10 5 1.0 2.0 3.0 4.0 Vin (V) 5.0 6.0 7.0
Vcs (V)
2.0
3.0
4.0 Vin (V)
5.0
6.0
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
Iin, Vcs, Brightness vs. Inductor Value 90 80 70
Iin (mA), Vcs (V)
10 9 8 7 Vcs 6 Brightness 5 4 3 Iin 2 1 1000
Brightness (ft-lm)
60 50 40 30 20 10 0 100
200
300
400
500
600
700
800
900
Inductor Value (H)
8
HV833
External Component Description
External Component Diode Cs Capacitor REL-osc 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 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 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. 220H Murata (LQH43MN221) inductors with 5.4 series DC resistance is typically recommended. For inductors with thesame inductance value but with lower series DC resistance, lower RSW value is needed to prevent high current 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 (300mW), an external resistor in series with one side of the lamp is recommended to help reduce the package power dissipation.
RSW-osc
Lx Inductor
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.
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.
05/02/02rev.8
(c)2002 Supertex Inc. All rights reserved. Unauthorized use or reproduction prohibited.
9
1235 Bordeaux Drive, Sunnyvale, CA 94089 TEL: (408) 744-0100 * FAX: (408) 222-4895 www.supertex.com

▲Up To Search▲

Price & Availability of HV833

	To Download HV833 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .