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PDF HV829A Data sheet ( Hoja de datos )
| Número de pieza | HV829A | |
| Descripción | High Voltage EL Lamp Driver | |
| Fabricantes | Supertex | |
| Logotipo |  |
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HV829A/B
HV829A/B
Advance Information
High Voltage EL Lamp Driver
Features
❑ Processed with HVCMOS® technology
❑ V voltage range = 2.7 to 5.5V DC
DD
❑ Output load up to 70nF (20 in2 for 3.5nF/ in2 lamp)
❑ Adjustable DC-DC converter frequency
❑ Continious output voltage regulation control
(from 50V to 200V)
Application
❑ Electronic Organizers
❑ Handheld Portable Computers
❑ Display Signs
❑ Portable Instrumentation Equipment
Typical Application Circuit
Off=VDD
On=GND
General Description
The Supertex HV829A/B are high voltage EL lamp driver inte-
grated circuits designed for driving EL lamps of up to 70nF at
1000Hz. The input supply voltage range is from 2.7V to 5.5V.
These devices use a single inductor, a high voltage switching
FET and a minimum number of passive components. The
HV829A/B will supply the EL lamp with an AC square wave with
a peak-to-peak voltage of two times the set regulated DC
voltage.
The HV829A/B has one internal oscillator and a high voltage EL
lamp driver. The frequency for the external switching MOSFET
is set by an external resistor connected between the RSW-osc pin
and GND. The EL frequency for the HV829A is equal to the
switching frequency divided by 64 where the EL frequency for the
HV829B is equal to the switching frequency divided by 128. Gate
of the external MOSFET is connected to the Gate pin. An
external inductor is connected between the Drain of external
MOSFET and VDD pin. A 0.01-2.5µF capacitor is connected
between Cs and ground. The EL lamp is connected between VA
and VB. The output voltage regulation level is controlled via the
VREG pin for dimming and/or conservation of power. The output
voltage regulation can be controlled continuously between 50V
and 200V depending on the voltage applied to VREG pin (0.75V
to 3V).
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
chosen by the user, 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 the AC
voltage of +/- VREG voltage across the EL lamp.
VDD
Vreg
+
VIN
-
CIN
1 VDD
VA 8
2 RSW-osc
VB 7
3 VREG
Gate 6
4 GND
CS 5
HV829ASG
EL Lamp
BAV21
Lx
CS
250V
VN2224N3 or
TN2425N8
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 prod1ucts, refer to the most current databook or to the Legal/Disclaimer page on the Supertex website.
1 page | ||
| Páginas | Total 4 Páginas | |
| PDF Descargar | [ Datasheet HV829A.PDF ] | |
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