TEA2018A datasheet(6/7 Pages) STMICROELECTRONICS

6 / 7 page

Starting Process (Figure 3)

Prior to starting, a low current is drawn from the

high voltage source through a high value resistor.

This current charges the power supply voltage

capacitor of the device.

No output pulses are available before the voltage

on pin 6 has reached the threshold level [VCC(start),

VCC rising].

During this time the TEA2018A draws only 1mA

(typically). When the voltage on pin 6 reaches this

threshold, base drive pulses appear.

The energy drawn by these pulses tends to dis-

charge the power supply storage capacitor. How-

ever a hysteresis of about 1.1V (typically) (

∆ VCC)

is implemented to avoid the device from stopping.

(stop)

(start)

VCC

4.9V

Figure 3 : Normal Start-up Sequence

910

(

µs)

on (min.)

C (nF)

Figure 4 : tON (min.) versus Ct

µF

385V

0.1

µF

0.1

µF

4 x 1N4007

RF Filter

2 x 12mH

0.5A

220 VAC

47k

Ω

1.2nF

3.9V

100

Ω

22k

Ω

4.7k

Ω

µF150Ω

8.2

Ω

R B

4.7

µF

4.7k

Ω

1N414 8

Ω

1N41 48

Ω

µF

Ω

BUV

46 A

159

15 9

2.2k

Ω

1nF

1kV

+12V

+5V

470 0

µF

100 0

µF

BYW98-50

220

µF

16V

Primary Ground

Second ary Ground

Maximum Power

≅ 30W

TEA2018A

Operating Frequency

≅ 30kHz

TYPICAL APPLICATION

TEA2018A

6/7

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