HV823 Supertex, Inc., HV823 Datasheet

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HV823

Manufacturer Part Number
HV823
Description
Manufacturer
Supertex, Inc.
Datasheet

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Features
Applications
Block Diagram
Processed with HVCMOS
2.0 to 9.5V operating supply voltage
DC to AC conversion
180V peak-to-peak typical output voltage
Large output load capability typically 50nF
Permits the use of high-resistance elastomeric lamp
components
Adjustable output lamp frequency to control lamp
color, lamp life, and power consumption
Adjustable converter frequency to eliminate
harmonics and optimize power consumption
Enable/disable function
Low current draw under no load condition
Handheld personal computers
Electronic personal organizers
GPS units
Pagers
Cellular phones
Portable instrumentation
RSW-Osc
REL-Osc
* Enable is available in die form only.
Enable *
GND
VDD
®
High Voltage EL Lamp Driver IC
technology
Switch
Osc
Disable
C
+
_
V
REF
General Description
The Supertex HV823 is a high-voltage driver designed for driv-
ing EL lamps of up to 50nF. EL lamps greater than 50nF can be
driven for applications not requiring high brightness. The input
supply voltage range is from 2.0V to 9.5V. 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 by connecting the resis-
tors on the RSW-Osc pin and the REL-Osc pin to the VDD pin,
and disabled when connected to GND.
The HV823 has two internal oscillators, a switching MOSFET
and a high-voltage EL lamp driver. The frequency of the switch-
ing converter 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 the VDD pin. A 0.01µF to
0.1µF capacitor is connected between the CS pin and the GND.
The EL lamp is connected between the VA and VB pins.
The switching MOSFET charges the external inductor and
discharges it into the C
to increase. Once the voltage at C
90V, the switching MOSFET is turned OFF to conserve power.
The output pins VA and VB are confi gured as an H-bridge and
are switched in opposite states to achieve 180V peak-to-peak
across the EL lamp.
For additional information, see Application Notes AN-H33
and AN-H34.
Output
Osc
Q
Q
Q
Q
S
capacitor. The voltage at C
S
reaches a nominal value of
VA
VB
LX
CS
HV823
S
will start

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HV823 Summary of contents

Page 1

... REL-Osc * Enable is available in die form only. General Description The Supertex HV823 is a high-voltage driver designed for driv- ing EL lamps 50nF. EL lamps greater than 50nF can be driven for applications not requiring high brightness. The input supply voltage range is from 2.0V to 9.5V. The device uses a single inductor and a minimum number of passive components ...

Page 2

... Min Typ Max - 2 160 180 - 30 - 150 - - - - - 330 380 HV823 REL-Osc GND 4 5 8-Lead SOIC (LG) (top view Last Digit of Year Sealed WW = Week Sealed L = Lot Number = “Green” Packaging 8-Lead SOIC (LG) Unit Conditions 9.5 V --- +85 ...

Page 3

... Inductor Value (µ REL-Osc 8 2.0KΩ 10nF Equivalent to 5 GND 5 3 square inch lamp. Brightness 6.5ft ( (V) CS 9.0 8.0 7.0 6.0 5.0 4.0 3.0 2.0 1.0 0 1000 HV823 ...

Page 4

... 2MΩ REL-Osc 8 3.1KΩ Equivalent to GND 5 6 square inch lamp 75V 380Hz vs ( ( (V) CS HV823 20nF Brightness 6.5ft- ...

Page 5

... EL Lamp 2.0MΩ REL-Osc 8 4.9KΩ Equivalent to GND 5 12 square inch lamp HV823 Brightness 8.5ft ( (V) CS HV823 42nF 8 90 ...

Page 6

... This is shown in Fig. 5. The regulated voltage can be used to run the internal logic of the HV823. The amount of current necessary to run the internal logic is typically 100µA Split Supply Confi guration for Battery Voltages of Higher than 9.5V Fig ...

Page 7

... SW 7 resistor connected between REL-Osc EL decreases. As the EL lamp EL EL-Osc between the will also decrease. CS capacitor is used The energy stored in the capaci will also increase. If the input power HV823 by a fac- decreases. ) should be value is SW ...

Page 8

... MAX 1.75 0.25 JEDEC Registration MS-012, Variation AA, Issue E, Sept. 2005. Drawings not to scale. (The package drawing(s) in this data sheet may not refl ect the most current specifi cations. For the latest package outline information go to http://www.supertex.com/packaging.html.) Doc. # DSFP-HV823 A091207 Note 1 h ...

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