HV830 datasheet(5/6 Pages) SUTEX

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HV830

External Component Description

External

Component

Description

Diode

Fast reverse recovery diode, BAS21LT1 or equivalent.

S Capacitor

0.01µF to 0.1µF, 200V 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 VDD

pins of the device. The lamp frequency increases as R

EL 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.

A 3.3MΩ resistor would provide lamp frequency of 220 to 280Hz. Decreasing the R

EL-Osc by a factor of 2 will

increase the lamp frequency by a factor of 2.

SW-Osc

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

SW between the RSW-Osc

and VDD pins of the device. The switching frequency increases as R

SW 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.

SW Capacitor

A 1nF capacitor is recommended between the RSW-Osc pin and GND when a 0.01µF C

S capacitor is used.

This capacitor is used to shunt any switching noise that may couple into the RSW-Osc pin. The C

SW capaci-

tor may also be needed when driving large EL lamp due to increase in switching noise. A C

SW larger than

1.0nF is not recommended.

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.

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 R

SW value is needed to prevent high cur-

rent 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 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.

HV830 Datasheet(PDF) 5 Page - Supertex, Inc

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