HV833MG datasheet(9/10 Pages) SUTEX

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HV833

External Component Description

External Component

Selection Guide Line

Diode

Fast reverse recovery diode, 100V 1N4148 or equivalent.

S Capacitor

0.003µF to 0.1µF, 100V capacitor to GND is used to store the energy transferred from the

inductor.

EL-Osc

The EL lamp frequency is controlled via an external R

EL resistor connected between REL-Osc

and V

DD 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 V

CS will decrease. The color of the EL lamp is dependent upon its frequency.

SW-Osc

The switching frequency of the converter is controlled via an external resistor, R

SW between

SW-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, V

CS, will also decrease.

X Inductor

The inductor L

X 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 C

S. 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 R

SW) 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 R

SW 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, (V

IN 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.

Split Supply Conﬁguration for Battery Voltages of Higher than 6.5V

Enable/Disable Conﬁguration

The HV833 can be easily enabled and disabled via a logic

control signal on the R

SW and REL resistors as shown in the

Typical Application Circuit on the front page. The control sig-

nal can be from a microprocessor. R

SW 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.

The Typical Application Circuit on the ﬁrst page can also be

used with high battery voltages such as 12V as long as the

input voltage, V

DD, to the HV833 device is within its speciﬁ-

cations of 1.8V to 6.5V. Split supply conﬁguration is shown

on Fig. 2.

Enable/Disable Table

Enable Signal

HV833

Enable

Disable

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