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PDF HV833 Data sheet ( Hoja de datos )
| Número de pieza | HV833 | |
| Descripción | High Voltage EL Lamp Driver | |
| Fabricantes | Supertex Inc | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de HV833 (archivo pdf) en la parte inferior de esta página. Total 8 Páginas | ||
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Supertex inc.
HV833
High Voltage
EL Lamp Driver
Features
►►1.8 to 6.5V operating supply voltage
►►DC to AC conversion
►►Separately adjustable lamp and converter
frequency
►►Output voltage regulation
►►Enable/disable function
►►Patented output timing for high efficiency
►►<100nA shutdown current
►►Split supply capability
►►LCD backlighting
Applications
►►Portable transceivers
►►Remote control units
►► Calculators
►► PDAs
►►Global Positioning Systems (GPS)
General Description
The Supertex HV833 is a high voltage driver designed for driving EL
lamps of up to 35nF (10-12in2). The input supply voltage range is from
1.8 to 6.5V. 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 ±90V. The chip can be enabled/disabled by
connecting a resistor between the RSW-Osc pin and the VDD/GND
pins.
The HV833 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 supply pin. The EL lamp driver frequency is set by an
external resistor connected between the REL-Osc pin and the VDD
pin. An external inductor is connected between the LX pin and VDD
or VIN pin. A 0.003-0.1µF capacitor is connected between the CS pin
and the GND pin. The EL lamp is connected between the VA pin and
the VB pin.
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 VA and VB
are configured as an H bridge and are switching in opposite states to
achieve 180V peak-to-peak across the EL lamp.
Typical Application Circuit
ON = VDD
OFF = 0
VDD
Enable Signal
+
_VIN
1 VDD
VA 8
2 RSW-Osc VB 7
3 REL-Osc CS 6
4 GND
LX 5
HV833
1N914
LX
EL Lamp
CS
100V
Doc.# DSFP-HV833
A061813
Supertex inc.
www.supertex.com
1 page  
Fig. 2: Typical Application
ON = VDD
OFF = 0
VDD
Enable Signal
750k
VDD = 3.0V, VIN = 5.0V
1 VDD
VA 8
2 RSW-Osc
VB 7
3 REL-Osc
CS 6
1.0M
+
VIN_
4.7µF
4 GND
LX 5
HV833
Typical Performance
Device
Lamp Size
HV833MG
6.0in2
*LX = 560µH Murata LQH43MN561K01
VIN
5.0V
IIN
30mA
VCS
70V
HV833
EL Lamp
6.0in2
1N914
LX*
560µH
0.01µF
100V
fEL
440Hz
Brightness
6.0ft-Im
TA
-25OC to + 85OC
Typical Performance Curves for Fig. 2 (EL Lamp = 6.0in2, VDD = 3.0, VIN = 5.0V)
90 IIN, VCS, Brightness vs. Inductor Value
10
80 9
70 8
60 VCS 7
50 6
40 5
Brightness
30 4
20 3
IIN
10 2
0
100
200
300 400 500
1
600 700 800 900 1000
Inductor Value (H)
VCS vs. VIN
90
IIN vs. VIN
25
80 20
70
60 15
50
10
40
30
1.0 2.0 3.0 4.0 5.0 6.0 7.0
VIN (V)
5
1.0 2.0 3.0 4.0 5.0 6.0 7.0
VIN (V)
10 Brightness vs. VIN
IIN vs. VCS
35
8 30
6 25
4 20
2 15
01.0 2.0 3.0 4.0 5.0 6.0 7.0
10
30 40 50 60 70 80 90
VIN (V)
VCS (V)
Doc.# DSFP-HV833
A061813
Supertex inc.
5 www.supertex.com
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet HV833.PDF ] | |
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