HV824
Advanced Information
High Voltage EL Lamp Driver
Ordering Information
Package Options
Device
Input Voltage
8-Lead SO
HV824LG
Die
HV824
1.0V to 1.6V
HV824X
General Description
Features
Processed with HVCMOS® technology
1.0V to 1.6V supply voltage
DC to AC conversion
The Supertex HV824 is a high voltage driver designed to drive EL
lampswithcapacitiveloadsof2nFto15nF. Theinputsupplyvoltage
range is 1.0V to1.6V. The device uses a single inductor and a
minimum number of passive components. Typical output voltage
applied to the EL lamp is 120V to 150V peak-to-peak. The HV824
can be enabled/disabled by connecting the RSW resistor to
Permits the use of high-resistance elastomeric lamp
connectors
V
DD/ground. In die form, the device has an enable bar pad which
Adjustable output lamp frequency to control lamp color,
lamp life, and power consumption
enables the IC when it is at logic low.
Adjustable converter frequency to eliminate harmonics and
optimize power consumption
The HV824 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 VDD pin. The ELlamp driver frequency is set by
an external resistor connected between the REL-osc pin and the VDD
pin. AnexternalinductorisconnectedbetweentheLx and VDD pins.
A 0.01µF to 0.1µF capacitor is connected between Cs and GND
pins. The EL lamp is connected between VA and VB.
Enable/disable function
Low current draw under no load condition
Applications
Pagers
The switching MOSFET charges the external inductor and dis-
charges it into the 0.01µF to 0.1µF capacitor at Cs. The voltage at
CS will start to increase. Once the voltage at Cs reaches a nominal
value of 75V, 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 a maximum voltage of
180V peak-to-peak across the EL lamp.
Portable Transceiver
Portable Instrumentation
Cellular Phones
Absolute Maximum Ratings*
Pin Configuration
Supply Voltage, VDD
-0.5V to +2.0V
-0.5V to +120V
-25°C to +85°C
-65°C to +150°C
400mW
Output Voltage, VCs
VDD
RSW-osc
REL-osc
GND
1
2
3
4
8
7
6
5
VA
VB
CS
LX
Operating Temperature Range
Storage Temperature Range
Power Dissipation
ςΑ
Note:
*All voltages are referenced to GND.
SO-8
top view
15-25