MC33441 데이터 시트보기 (PDF) - ON Semiconductor

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MC33441

Electroluminescent Lamp Driver IC

ON Semiconductor 

MC33441

APPLICATION INFORMATION

EL Lamp Selection

EL lamps are a laminate which exhibit a capacitance on

the order of 2.5 nF to 3.5 nF per square inch. The light will

emit as the high voltage is applied across the electrodes of

this capacitance. The color of the emitted light is determined

by the type of chemical used and the frequency of the

excitation voltage. On the other hand, the lamp brightness

increases approximately the square of the applied voltage

and nearly linear to the excitation frequency. Once a lamp

has been selected, the operating frequency and the essential

voltage for the optimum performance is determined. Then,

the driver circuit can begin to design.

Inductor Selection (L1)

Use a 1 mH/0.15 A inductor for MC33441. Higher

inductor values can be used to reduce the peak transient coil

current from the battery supply. As the value of the inductor

(L1), increases, the resistor (R1) value may need to increase

correspondingly to provide optimum performance. While a

lower inductor values lead to smaller physical size, it will

generate a higher peak coil current. A lower resistor (R1)

value should be used when a lower inductance coil is being

used.

The inductor must have a saturation current rating equal

to or bigger than the peak coil current which is 150 mA.

Filter Capacitor Selection (C2)

See Table 1 for the estimated value of the filter capacitors

based on the input voltage supply. Since the maximum

voltage of the filter capacitor can reach 70 V or even 80 V,

capacitor with high voltage rating will be required.

Resistor Selection (R1)

Since the fundamental frequency of the oscillator is set by

the external resistor (R1), the temperature coefficient of the

frequency is dominated by the value of this resistor. A low

temperature coefficient (TC) resistor is suggested to use for

keeping the variation of oscillator’s frequency low against the

operation temperature range. (See Page 4, Fig. 3 & Fig. 4)

R1

+

REXT

+

4.341

FEL

107

W

Layout

The MC33441 is high output voltage operation make PC

board layout critical to minimize ground bounce and noise.

Locate input bypass capacitor, filter capacitor and

oscillator’s resistor as close to the device pins as possible.

BATTERY

PB1

C1 ENABLE

0.1 μF

R1

130 K

U1

1 VDD

2 ENB

3 RT1

4 VSS

EL1 8

EL2 7

FILTER 6

COIL 5

MC33441 (TSSOP−8)

L1

1 mH

EL−LAMP

C2

27 nF/100 V

Figure 10. MC33441 Demo Board Schematic

COMPONENT SUPPLIER

Supplier

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Tech−Wave Industrial Co., Ltd.

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Coils Electronics Co., Ltd.

Part Number

Part# CC−0012

Part# CRCH664−

102K−831015

Description

EL−Lamp: 14.5 mm x 47 mm Color:

Yellow−Green

Inductor: 1 mH / 0.15 A

Phone

(886)−2−22692827

(852)−2341−5539

http://onsemi.com

7

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