TEA2018 데이터 시트보기 (PDF) - STMicroelectronics
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TEA2018 Datasheet PDF : 7 Pages
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TEA2018A
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),
Figure 3 : Normal Start-up Sequence
V C+ C
VCC (start)
6V
VC+C
4.9V
VCC (stop)
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.
Figure 4 : tON (min.) versus Ct
t on (min.) (µs)
12
10
8
6
4
t
2
C t (nF)
1 2 3 4 5 6 7 8 9 10
TYPICAL APPLICATION
4 x 1N4007
4 7µF
3 85V
1N41 48 68Ω
RF Filter
2 x 12mH
0.1µF
0.1µF
0.5A
220 VAC
Maximum Power ≅ 30W
Operating Frequency ≅ 30kHz
4.7 kΩ
4.7µF
15Ω 1N414 8
2 20µF
1 6V
1kΩ
22kΩ
4.7kΩ
8
7
6
5
47kΩ
1
TEA2018A
2
3
1 0µF
4
1.2nF
1 00Ω
3.9V
BA
15 9
RB
8.2Ω
2.2 kΩ
3W
BUV
BA
46 A
1 59
1 50Ω
1nF
1kV
47µF
Re
1Ω
BYW98-50
100 0µF
+12V
BYW98-50
+5V
470 0µF
Primary Ground
Second ary Ground
6/7
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