hv829a Supertex, Inc., hv829a Datasheet
hv829a
Manufacturer Part Number
hv829a
Description
High Voltage El Lamp Driver - Supertex, Inc
Manufacturer
Supertex, Inc.
Datasheet
1.HV829A.pdf
(4 pages)
Typical Application Circuit
Features
Application
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.
Processed with HVCMOS
V
Output load up to 70nF (20 in
Adjustable DC-DC converter frequency
Continious output voltage regulation control
(from 50V to 200V)
Electronic Organizers
Handheld Portable Computers
Display Signs
Portable Instrumentation Equipment
DD
voltage range = 2.7 to 5.5V DC
V
IN
Vreg
V
®
DD
+
-
technology
Off=V
On=GND
2
for 3.5nF/ in
DD
High Voltage EL Lamp Driver
C
IN
2
lamp)
1
2
3
4
V
R
V
GND
HV829ASG
DD
REG
SW-osc
Gate
1
V
V
C
A
B
S
8
7
6
5
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 R
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 V
between Cs and ground. The EL lamp is connected between V
and V
V
voltage regulation can be controlled continuously between 50V
and 200V depending on the voltage applied to V
to 3V).
The switching MOSFET charges the external inductor and
discharges it into the capacitor at C
to increase. Once the voltage at C
chosen by the user, the switching MOSFET is turned OFF to
conserve power. The outputs V
bridge and are switching in opposite states to achieve the AC
voltage of +/- VREG voltage across the EL lamp.
REG
B
pin for dimming and/or conservation of power. The output
. The output voltage regulation level is controlled via the
C
250V
S
BAV21
EL Lamp
DD
pin. A 0.01-2.5µF capacitor is connected
Advance Information
VN2224N3 or
TN2425N8
Lx
A
and V
S
S
. The voltage at C
reaches a nominal value
HV829A/B
B
are configured as an H
REG
HV829A/B
pin (0.75V
S
SW-osc
will start
pin
A
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hv829a Summary of contents
Page 1
... 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 ...
Page 2
... µ HV829A Gate ...
Page 3
... Switch OSC Divided ° Gate Cs V High Voltage Level Trans- lators V HV829A ...
Page 4
... SW-osc Gate 6 REG 4 GND HV829ASG 4.7µ 9.0V 195mA 153V 4 EL Lamp Lx BAV21 VN2224N3 4.2µF 250V f f Brightness SW EL 25KHz 390Hz 18.5ft-lm 1235 Bordeaux Drive, Sunnyvale, CA 94089 TEL: (408) 744-0100 • FAX: (408) 222-4895 HV829A/B 09/05/02rev.2 www.supertex.com ...