HV833MG-G(2013) Ver la hoja de datos (PDF) - Supertex Inc
Número de pieza
componentes Descripción
Fabricante
HV833MG-G Datasheet PDF : 8 Pages
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HV833
Enable/Disable Configuration
The HV833 can be easily enabled and disabled via a logic
control signal on the RSW and REL resistors as shown in the
Typical Application Circuit on the front page. The control sig-
nal can be from a microprocessor. RSW and REL are typically
very high values. Therefore, only 10’s of microamperes will
be drawn from the logic signal when it is at a logic high (en-
able) state. When the microprocessor signal is high the de-
vice is enabled and when the signal is low, it is disabled.
Enable/Disable Table
Enable Signal
VDD
0V
HV833
Enable
Disable
Split Supply Configuration for Battery Voltages of Higher than 6.5V
The Typical Application Circuit on the first page can also be cations of 1.8V to 6.5V. Split supply configuration is shown
used with high battery voltages such as 12V as long as the on Fig. 2.
input voltage, VDD, to the HV833 device is within its specifi-
External Component Description
External
Component
Selection Guide Line
Diode
Fast reverse recovery diode, 100V 1N4148 or equivalent.
CS
Capacitor
0.003µF to 0.1µF, 100V 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.
RSW-Osc
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.
LX
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. As the inductor value decreases, the switching
frequency of the inductor (controlled by RSW) should be increased to avoid saturation.
A 220µH Murata (LQH43MN221) inductor with 5.4Ω series DC resistance is typically recommended.
For inductors with the same inductance value but with lower series DC resistance, a 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 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.
Doc.# DSFP-HV833
A061813
Supertex inc.
7
www.supertex.com
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