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TEA2018A Datasheet(PDF) 6 Page - STMicroelectronics |
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TEA2018A Datasheet(HTML) 6 Page - 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. t V (stop) CC V (start) CC VCC + VCC + 6V 4.9V Figure 3 : Normal Start-up Sequence 12 10 8 6 4 2 12 3 45 67 8 910 t ( µs) on (min.) C (nF) t Figure 4 : tON (min.) versus Ct 47 µF 385V 0.1 µF 0.1 µF 4 x 1N4007 RF Filter 2 x 12mH 0.5A 220 VAC 87 6 5 4 3 2 1 47k Ω 1k Ω 1.2nF 3.9V 100 Ω 22k Ω 4.7k Ω 10 µF150Ω 8.2 Ω R B 4.7 µF 4.7k Ω 1N414 8 15 Ω 1N41 48 68 Ω 47 µF R e 1 Ω BUV 46 A BA 159 BA 15 9 2.2k Ω 3W 1nF 1kV +12V +5V 470 0 µF 100 0 µF BYW98-50 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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