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°.