CPC6826

R00C

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11

4.5 Output Oscillator Frequency

Setting the output oscillator frequency is accomplished

increases as the resistor value decreases. For resistor

value selections refer to the typical characteristics

Resistor.

The switching frequency range is 60Hz to 1000Hz,

with an accuracy of +/- 20%. Note that higher EL

frequencies draw more current from the battery. In

addition to this, the color of the EL lamp and the light

intensity are also dependent on the frequency.

4.6 Enable/Disable Function

This function can be implemented to manually enable

or disable the CPC6826. The enable function is

CPC6826, connect the two resistors to GND.

5. External Component Description

5.1 Diode

The application circuit lists fast-reverse-recovery

diodes such as the 1SS400T1G in the SOD523

package, with a breakdown voltage of 100V and a

forward current rating of 200mA. The typical voltage

drop is 950mV at 25°C and the reverse recovery time,

5.2 Output Capacitor

pin 6, is based on the particular application circuit and

is dependent on peak inductor current, inductor size,

and the load. The application circuits give values

ranging from 0.01

μF to 0.1μF with a working voltage of

100V. Ceramic capacitors come in 0805 or 1206 size

with an X7R temperature coefficient. If the application

requires higher stability over temperature, use a

capacitor with a COG or NPO temperature coefficient.

5.3 Inductor

The inductor value depends on the specific application

requirements. In general, inductor values for typical

application circuits range from 100

μH up to 1mH. The

smaller value inductors are well suited to drive larger

lamp sizes due to their inherent high current handling

capability. Note that when inductor value decreases,

increased to avoid inductor saturation.

A 220

μH Murata (LQH43MN221K03) inductor with

5.4-Ohm series DC resistance, 110mA rated current,

and +/- 10% tolerance is recommended. For inductors

with the same value and lower series DC resistance,

Murata offers the LQH43 series from 100

μH to 560μH

in the 1812 package size.

The EL lamp frequency is controlled via an external

decreases. Higher EL frequency will increase the

current that is drawn from the battery and will

Lamp also depends on its frequency. The size of the

resistor used in the application is 0603 with a

tolerance of 1%. Smaller size resistors can be used to

reduce board space consumed.

The switching frequency of the converter is set by

Increasing the value of Rsw will decrease the

switching frequency of the internal oscillator, which in

6. The size of the resistor used in the application is

0603 with a tolerance of 1%. Smaller size resistors

can be used to reduce board space consumed.

0.1

1

10

10

100

1000

10000

CPC6826

Output Oscillator Frequency

vs. R