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PDF HV830 Data sheet ( Hoja de datos )
| Número de pieza | HV830 | |
| Descripción | High Voltage EL Lamp Driver | |
| Fabricantes | Supertex Inc | |
| Logotipo |  |
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Supertex inc.
HV830
High Voltage EL Lamp Driver IC
Features
►► Processed with HVCMOS® technology
►► 2.0 to 9.5V operating supply voltage
►► DC to AC conversion
►► 200V 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 harmon-
ics and optimize power consumption
►► Enable/disable function
►► Low current draw under no load condition
►► Very low standby current - 30nA typical
Applications
►► Handheld personal computers
►► Electronic personal organizers
►► GPS units
►► Pagers
►► Cellular phones
►► Portable instrumentation
General Description
The Supertex HV830 is a high-voltage driver designed for
driving 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 2.0 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 ±100V. The chip can be enabled
by connecting the resistors on the RSW-Osc and REL-Osc
pins to the VDD pin, and disabled when connected to GND.
The HV830 has two internal oscillators, a switching MOSFET
and a high-voltage EL lamp driver. The frequency of the
switching converter MOSFET is set by an external resistor
connected between the RSW-Osc and the VDD pins. The EL
lamp driver frequency is set by an external resistor connected
between the REL-Osc and the VDD pins. An external induc-
tor is connected between the LX and VDD pins. 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 CS capacitor. The voltage at CS will
start to increase. Once the voltage at CS reaches a nominal
value of 100V, the switching MOSFET is turned OFF to con-
serve power. The output pins VA and VB are configured as
an H-bridge and are switched in opposite states to achieve
200V peak-to-peak across the EL lamp.
Block Diagram
VDD
RSW-Osc
GND
Switch
Osc
+
Disable C_ VREF
REL-Osc
Q
Q
Output
Osc
Q
Q
LX
CS
VA
VB
Doc. # DSFP-HV830
E072913
Supertex inc.
www.supertex.com
1 page  
HV830
External Component Description
External
Component
Diode
Description
Fast reverse recovery diode, BAS21LT1 or equivalent.
CS
Capacitor
0.01µF to 0.1µF, 200V capacitor to GND is used to store the energy transferred from the inductor.
REL-Osc
The EL lamp frequency is controlled via an external REL resistor connected between REL-Osc and VDD
pins of the device. The lamp frequency increases as REL decreases. As the EL lamp frequency increases,
the amount of current drawn from the battery will increase and the output voltage VCS will decrease. The
color of the EL lamp is dependent upon its frequency.
A 3.3MΩ resistor would provide lamp frequency of 220 to 280Hz. Decreasing the REL-Osc by a factor of 2
will increase the lamp frequency by a factor of 2.
RSW-Osc
CSW
Capacitor
LX
Inductor
The switching frequency of the converter is controlled via an external resistor, RSW between the RSW-Osc
and VDD pins of the device. The switching frequency increases as RSW decreases. With a given inductor,
as the switching frequency increases, the amount of current drawn from the battery will decrease and the
output voltage, VCS, will also decrease.
A 1nF capacitor is recommended between the RSW-Osc pin and GND when a 0.01µF CS capacitor is
used. This capacitor is used to shunt any switching noise that may couple into the RSW-Osc pin. The CSW
capacitor may also be needed when driving large EL lamp due to increase in switching noise. A CSW larger
than 1.0nF is not recommended.
The inductor LX is used to boost the low input voltage by inductive flyback. When the internal switch is
on, the inductor is being charged. When the internal switch is off, the charge stored in the inductor will
be transferred to the high voltage capacitor CS. The energy stored in the capacitor is connected to the
internal H-bridge and therefore to the EL lamp. In general, smaller value inductors, which can handle
more current, are more suitable to drive larger size lamps. As the inductor value decreases, the switching
frequency of the inductor (controlled by RSW) should be increased to avoid saturation.
220µH Murata inductors with 5.4Ω series DC resistance is typically recommended. For inductors with the
same inductance value but with lower series DC resistance, lower RSW value is needed to prevent high
current draw and inductor saturation.
Lamp
As the EL lamp size increases, more current will be drawn from the battery to maintain high voltage across
the EL lamp. The input power, (VIN x IIN), will also increase. If the input power is greater than the power dis-
sipation of the package (400mW), an external resistor in series with one side of the lamp is recommended
to help reduce the package power dissipation.
Doc. # DSFP-HV830
E072913
Supertex inc.
5 www.supertex.com
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet HV830.PDF ] | |
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