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Details, datasheet, quote on part number:HV833DB1
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Datasheet text preview:
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 0.003-0.1µF 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
09/05/02
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
V DD RSW-osc R EL-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 +85°C -65°C to +150°C 300mW
Top View
Enable/Disable Table
(See Typical Application on Front Page)
RSW resistor V DD 0V HV833 Enable Disable
Electrical Characteristics
DC Characteristics (Over recommended operating conditions unless otherwise specified, TA=25°C)
Symbol RDS(on) VCs VA-B I DDQ I DD IIN VCS fEL f SW 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 µA 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/Test Circuit
Equivalent to 10in2 lamp 680
ON=VDD OFF=0 VDD
Enable Signal
VDD=VIN=3.3V
1 VDD
1.0M
VA VB
8
29nF
2 RSW-osc
VIN
7
+ _
4.7µF
3 REL-osc
1.65M
CS 6 LX 5 1N914 LX* 220µH
4 Gnd
HV833MG
0.01µF 100V
* Lx = 220µH Murata LQH43MN221K01
Typical Performance
Device HV833MG Lamp Size 10 in2 VIN 3.3V IIN 56mA VCS 72V f EL 270Hz Brightness 5.0ft-lm TA -25°C to +85°C
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