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PDF HV832 Data sheet ( Hoja de datos )
| Número de pieza | HV832 | |
| Descripción | High Voltage Dual EL Lamp Driver | |
| Fabricantes | Supertex Inc | |
| Logotipo |  |
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HV832
High Voltage Dual EL Lamp Driver
for Low Noise Applications
Features
► Patented audible noise reduction
► Patented lamp aging compensation
► 210 VPP output voltage for higher brightness
► Patented output timing for high efficiency
► Single cell lithium ion compatible
► 150nA shutdown current
► Wide input voltage range 1.8V to 5.0V
► Separately adjustable lamp and converter
frequencies
► Output voltage regulation
► Split supply capability
Applications
► LCD backlighting
► Mobile Cellular Phone keypads
► PDAs
► Handheld wireless communication products
► Global Positioning Systems (GPS)
General Description
The Supertex HV832 is a high voltage driver designed for driving two
EL lamps with a combined area of 3.5in2. The input supply voltage
range is from 2.0V to 5.0V. The device is designed to reduce the
amount of audible noise emitted by the lamp. It uses a single inductor
and a minimum number of passive components. The nominal
regulated output voltage that is applied to the EL lamp is ±90V.
The HV832 has an internal oscillator, a switching MOSFET, and
two high voltage EL lamp drivers. The frequency for the switching
MOSFET is set at 51KHz nominal. The EL lamp driver frequency is
set by dividing the MOSFET switching frequency by 128. An external
inductor is connected between the LX and VDD or VIN pins for split
supply applications. A 0.001 to 0.01µF, 100V capacitor is connected
between the CS pin and Ground. The EL lamps are connected
between EL1 to Com and EL2 to Com.
An input control pin is available to select various modes of the device.
Each logic pulse applied to the control pin will cause the device to
change to the next mode. The sequence for the modes is: (1) EL1 on
only, (2) EL2 on only, (3) both EL1 and EL2 on, and (4) device shuts
down. During power up of the device, the mode will default to shut
down.
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 of 90V, the switching
MOSFET is turned off to conserve power. The outputs EL1 to Com
and EL2 to Com are configured as H bridges EL1/EL2 and Com
and are switching in opposite states to achieve 180V across the EL
lamp.
Typical Application Circuit
VDD
Logic Input Pulse
+
VIN _
CIN
1 EL1
EL2 8
2 VDD
Com 7
3 Control CS 6
4 GND
LX 5
HV832MG
EL Lamp 1
EL Lamp 2
LX CS
1 page  
HV832
Split Supply Configuration
The HV832 can also be used for handheld devices operat-
ing from a battery where a regulated voltage is available.
This is shown in Fig. 2. The regulated voltage can be used
to run the internal logic of the HV832. The amount of current
necessary to run the internal logic is 150µA Max at a VDD of
3.0V. Therefore, the regulated voltage could easily provide
the current without being loaded down.
Fig. 2: Split Supply
Regulated Voltage = VDD
Logic Input Pulse
+
Battery Voltage = VIN_
CIN
1 EL1
EL2 8
2 VDD
Com 7
3 Control CS 6
4 GND
LX 5
HV832MG
EL Lamp 1
EL Lamp 2
LX CS
External Component Description
External Component
Diode
C Capacitor
S
Lx Inductor
Selection Guide Line
Fast reverse recovery diode, IN914 diode or equivalent.
0.003µF to 0.1µF, 200V capacitor to GND is used to store the energy transferred from the inductor.
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.
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
dissipation of the package (300mW), an external resistor in series with one side of the lamp is recommended
to help reduce the package power dissipation.
5
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet HV832.PDF ] | |
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