AN993 datasheet(9/27 Pages) STMICROELECTRONICS

Datenblatt-Suchmaschine für elektronische Bauteile

AN993 Datenblatt(PDF) 9 Page - STMicroelectronics

Teilenummer	AN993

Bauteilbeschribung	Electronic ballast with PFC using L6574 and L6561

PDF	27 Pages

Scroll/Zoom	100%

Hersteller	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

Logo

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

War ALLDATASHEET hilfreich? [ DONATE ]
Über Alldatasheet \| Werbung \| Kontakt \| Privatsphäre und Datenschutz \| Link zum Datenblatt \| Linktausch \| Hersteller All Rights Reserved©Alldatasheet.com
Mirror Sites English : Alldatasheet.com \| English : Alldatasheet.net \| Chinese : Alldatasheetcn.com \| German : Alldatasheetde.com \| Japanese : Alldatasheet.jp Russian : Alldatasheetru.com \| Korean : Alldatasheet.co.kr \| Spanish : Alldatasheet.es \| French : Alldatasheet.fr \| Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com \| Polish : Alldatasheet.pl \| Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in \| Mexican : Alldatasheet.com.mx \| British : Alldatasheet.co.uk \| New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com \| icmetro.com

War ALLDATASHEET hilfreich? [ DONATE ]

Family Site : ic2ic.com | icmetro.com