HV829A/B
HV829A/B
Advance Information
High Voltage EL Lamp Driver
Features
❑
Processed with HVCMOS
®
technology
❑
V
DD
voltage range = 2.7 to 5.5V DC
❑
Output load up to 70nF (20 in
2
for 3.5nF/ in
2
lamp)
❑
Adjustable DC-DC converter frequency
❑
Continious output voltage regulation control
(from 50V to 200V)
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
SW-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 V
DD
pin. A 0.01-2.5µF capacitor is connected
between Cs and ground. The EL lamp is connected between V
A
and V
B
. The output voltage regulation level is controlled via the
V
REG
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 V
REG
pin (0.75V
to 3V).
The switching MOSFET charges the external inductor and
discharges it into the capacitor at C
S
. The voltage at C
S
will start
to increase. Once the voltage at C
S
reaches a nominal value
chosen by the user, the switching MOSFET is turned OFF to
conserve power. The outputs V
A
and V
B
are configured as an H
bridge and are switching in opposite states to achieve the AC
voltage of +/- VREG voltage across the EL lamp.
Application
❑
Electronic Organizers
❑
Handheld Portable Computers
❑
Display Signs
❑
Portable Instrumentation Equipment
Typical Application Circuit
Off=V
DD
On=GND
V
DD
1
V
DD
V
A
8
EL Lamp
V
B
7
Gate
6
C
S
5
BAV21
Lx
Vreg
2
R
SW-osc
3
V
REG
4
GND
+
V
IN
-
C
IN
HV829ASG
C
S
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 products, refer to the most current databook or to the Legal/Disclaimer page on the Supertex website.
1
HV829A/B
Ordering Information
Package
Device
HV829A
HV829B
Output EL Frequency
SO-8 w/ Heat Slug
Sw oscillator / 64
Sw oscillator / 128
HV829ASG
HV829BSG
Die
HV829AX
HV829AX
** Mounted on FR4 board, 25mm x 25mm x 1.57mm.
Absolute Maximum Ratings*
Input Voltage to the external Inductor
V
DD
Output voltage, V
CS
Operating Temperature
Storage Temperature
Power Dissipation
+18V
+7.0V
-.05V to +250V
-25°C to +85°C
-65°C to +150°C
1.5W
Suggested Pin Configuration
V
DD
R
SW
V
REG
GND
1
2
3
4
8
7
6
5
V
A
V
B
Gate
C
S
*Absolute Maximum Ratings are those values beyond which damage to the device
may occur. Functional operation under these conditions is not implied. Continuous
operation of the device at the absolute rating level may affect device reliability. All
voltages are referenced to device ground.
MSOP-8
Top View
Electrical Characteristics
DC Characteristics
Symbol
(Over recommended operating conditions unless otherwise specified, T
A
=25°C).
Min
42
V
CS
Max. output regulation voltage
(V
DD
=2.7 to 5.5V, No load)
Inductor switching frequency
Quiescent V
DD
supply current
Input current going into the V
DD
pin
Input current including inductor current
Quiescent supply current (no load)
84
V
A
– V
B
Differential output voltage across the
lamp
180
270
380
100
200
300
400
90
135
180
f
sw
I
DDQ
I
DD
I
IN
I
INQ
20
Parameter
Typ
50
100
150
200
25
Max
58
110
165
220
30
400
400
195
200
100
116
220
330
440
Units
V
REG
= 0.75V
V
V
REG
= 1.5V
V
REG
= 2.25V
V
REG
= 3.0V
KHz
nA
µA
mA
µA
µA
Conditions
V
CS
= 150V, C
L
= 57nF, R
SW-OSC
= 1M
See Figure 1.
,
V
CS
= 150V, R
SW-OSC
=1M
V
REG
= 0.75V
V
V
REG
= 1.5V
V
REG
= 2.25V
V
REG
= 3.0V
Recommended Operating Conditions
f
SW
f
EL
t
R
t
F
t
r-Gate
t
f-Gate
Inductor switching frequency
Output drive frequency
Output rise time
Output fall time
Gate rise time
Gate fall time
51.2
0.8
235
235
64
1.0
300
300
150
50
76.8
1.2
365
365
KHz
µs
ns
R
SW-osc
=400
, C
L
=70nF
, C
L
=70nF,
V
CS
=200V, R
SW-osc
=400
f
EL
=1KHz
C
G
=2500pF Gate to GND
2
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