FEATURES

Transformer-less

Light weight

Single-ended output

High efficiency

Output voltage can be independent or dependant of the power

supply input voltage

APPLICATIONS

Driving an EL (Electroluminescent) lamp with high

efficiency.

DESCRIPTION

This inverter converts a low DC input voltage, 19V to 31V,

into a high AC output voltage, up to 90V, for driving a large

area, up to 70 square inch, EL lamp. It comes with an internal

POT (Potentiometer) for adjusting the output voltage

magnitude so that the brightness of the EL lamp can be

dimmed down when needed. In addition, an external 10kΩ

POT can also be used to dim the output further, if needed.

The inverter will work fine without connecting the external

POT.

Depending on the applications, there are 2 versions for the

output voltage control algorithms: the output voltage is

independent of the input voltage, AEL28V90VACR; or the

output voltage is dependant of the input voltage from the

power supply, AEL28V90VAC1. For the dependant version,

when setting the internal POT, or both internal and external

POTs, to the maximum angle, the relationship between the

input and output voltages is as following:

This version emulates unregulated inverter of which the

output voltage magnitude is proportional to the power supply

input voltage value. This type of inverter can be used to

replace unregulated transformer based inverter directly.

Another type of inverter, so-called regulated version, is

available for applications needing constant output voltage

magnitude regardless of the input voltage value. The output

voltage is solely set by the internal POT or the internal POT

combined with the external POT.

Both versions of the controllers have a built-in potentiometer

(POT), which can be used for adjusting the output voltage,

thus the brightness of the EL lamp. The relationship between

this POT and the output voltage is shown in Figure 3. In

addition, an external POT can also be used for dimming the

brightness further, the output voltage vs. the setting angle of

the external POT is shown in Figure 4. The maximum turning

angle of internal POT is 260°.