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L6598 Datasheet(PDF) 8 Page - STMicroelectronics

Part # L6598
Description  HIGH VOLTAGE RESONANT CONTROLLER
PDF  16 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6598 Datasheet(HTML) 8 Page - STMicroelectronics

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L6598
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Start Timing Constant) is 0.15 s/
µF.
The current Iosc is fed to the oscillator as shown in fig. 5. It is twice mirrored (x4 and x8) generating the triangular
wave on the oscillator capacitor Cf. Referring to the internal structure of the oscillator (fig.5), a good relationship
to compute an approximate value of the oscillator frequency in normal operation is:
[7]
The degree of approximation depends on the frequency value, but it remains very good in the range from 30kHz
to 100kHz (figg.6-10)
Figure 5. Oscillator Block
fmin
1.41
R
fminCf
--------------------
=
X8
X4
Iosc
Vth+
Vth-
S
R
Cf
+
+



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