SM8146AD1 データシートの表示（PDF） - Nippon Precision Circuits
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SM8146AD1 Datasheet PDF : 19 Pages
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SM8146AD1
(2) EL Brightness Adjustment using EL Drive Frequency
This dimming function changes the EL brightness in response to the EL drive frequency determined by the
value of the resistance of ROCE connected to the OCE pin. This dimming property should only be set when
determining the peripheral components. It is not recommended to vary the EL brightness by switching the
ROCE resistance.
EL Output Voltage Waveform (Sine Wave) Distortion
OUT1
OUT2
OUT1 - OUT2
Flat regions near the waveform peaks of EL driving voltage are generated in principle of operation. They are
not failure and do not affect the brightness and the audible noise.
OUT1
OUT2
OUT1 - OUT2
VOUT1 − VOUT2
Depending on conditions, the OUT1/OUT2 output waveform may become distorted as shown by the solid line
in the figure above. If the booster circuit drive capability is insufficient, the circuit may not be able to provide
the boost required to meet the ideal curve shown by the dotted line in the figure above. This condition can be
caused by the inductor supply voltage being too low, the inductance value being too high, the inductor fre-
quency being too high, the EL drive frequency being too high, or the EL surface area being too large.
SEIKO NPC CORPORATION —9
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