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AN1673 датащи(PDF) 5 Page - STMicroelectronics

номер детали AN1673
подробное описание детали  L6598 OFF-LINE CONTROLLER FOR RESONANT CONVERTERS
PDF  24 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN1673 датащи(HTML) 5 Page - STMicroelectronics

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AN1673 APPLICATION NOTE
Figure 3. Oscillator Block
Figure 4. Frequency Diagrams
BOOTSTRAP SECTION.
The supply of the high voltage section is obtained by means of a bootstrap circuitry. This solution normally
requires a high voltage fast recovery diode for charging the bootstrap capacitor (fig. 5a). In the device a
patented integrated structure, replaces this external diode. It is realised by means of a high voltage DMOS,
driven synchronously with the low side driver (LVG), with in series a diode, as shown in fig. 5b.
+
TSS
CSS
Cf
ISS
Ifstart
Ifmin
IOSC
S
R
Vth+
Vth-
+
+
X4
X8
D03IN1444
0
0
200
400
Cf(pF)
200
400
fmin
(KHz)
Rf=90K
Ω - calc.
Rf=90K
Ω - meas.
Rf=19.9K
Ω - calc.
Rf=19.9K
Ω - meas.
D03IN1442
20
40
60
80
100 Rfmin(KΩ)
20
40
60
80
100
fmin
(KHz)
D98IN891



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