MIC4826 datasheet(7/12 Pages) MICREL

7 / 12 page

August 2004

MIC4826

Micrel

EL Frequency

The EL lamp frequency is controlled via an external resistor

connected between REL pin and VDD pin of the device. As

the lamp frequency increases, the resistor value decreases.

For resistor value selections, see the “Typical

Characteristics: EL Frequency vs. EL Resistor” or use the

equation below. The EL frequency range is 60Hz to 1000Hz,

with an accuracy of

±20%.

fHz

()

Ω

360

TIME (2ms/div)

IN = 3.0V

L = 220

µH

OUT = 0.01µF

Lamp = 2in2

SW = 442k

EL = 2M

Figure 3. 180Hz Output Waveform

In general, as the EL lamp frequency increases, the amount

of current drawn from the battery will increase. The color of

the EL lamp and the intensity are dependent upon its fre-

quency.

TIME (2ms/div)

IN = 3.0V

L = 220

µH

OUT = 0.01µF

Lamp = 2in2

SW = 562k

EL = 1M

Figure 4. 360Hz Output Waveform

Enable Function

The enable function of the MIC4826 is implemented by

switching the R

SW and REL resistor between ground and VDD.

When R

SW and REL are connected to ground, the switch and

the EL oscillators are disabled; therefore the EL driver be-

comes disabled. When these resistors connect to V

DD, both

oscillators will function and the EL driver is enabled.

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