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AN993 Fiches technique(PDF) 9 Page - STMicroelectronics

No de pièce AN993
Description  Electronic ballast with PFC using L6574 and L6561
PDF  27 Pages
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN993 Fiches technique(HTML) 9 Page - STMicroelectronics

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AN993
Device block description
Doc ID 5656 Rev 10
9/27
That is to say:
Equation 2
After the preheating time, the capacitor Cpre is first quickly discharged and then recharged
by the current Ifs, generating a second voltage ramp which feeds a transconductance
amplifier, as shown in Figure 6 (the switch is closed). Thus, this voltage signal is converted
into a growing current which is subtracted from Imax to produce the frequency shifting from
fmax to fmin. The current that drives the oscillator to set the frequency during this shifting is
equal to:
Equation 3
Figure 5.
Timing block
Figure 6.
Timing oscillator block
AM01313v1
Cpre
Ifs
Ipre
DISCHARGE
AM01314v1
Cpre
Imin
Imax
TIMING
C
S
O
m
g
Iosc



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