AN993 datasheet(9/27 Pages) STMICROELECTRONICS

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AN993 Datasheet(PDF) 9 Page - STMicroelectronics

Part #	AN993

Description	Electronic ballast with PFC using L6574 and L6561

PDF	27 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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9 / 27 page

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

Iosc

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