UBA2021 Просмотр технического описания (PDF) - Philips Electronics

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UBA2021

630 V driver IC for CFL and TL lamps

Philips Electronics 

Philips Semiconductors

630 V driver IC for CFL and TL lamps

DESIGN EQUATIONS

• Bottom frequency: fB = -2----×-----{---[---(--C-----C----F----+-----C----p---a---r--)---×-----(---X--1--1-----×-----R----R----R----E---F----–-----R----i--n---t-)---]---+-----τ---}-

•

Feed-forward frequency:

fff

=

-------------------------------------------------------------1--------------------------------------------------------------

2

×







(CCF

+

Cpar)

×





X-----2---I--i×-(--R--V-H---R-V---R)---E---F--

–

Ri



n t

+

τ







Where:

– X1 = 3.68

– X2 = 22.28

– τ = 0.4 µs

– Rint = 3 kΩ

– Cpar = 4.7 pF

• Operating frequency is the maximum of fB, fff or fcm

Where:

– fB = bottom frequency

– fff = feed-forward frequency

– fcm = frequency due to capacitive mode detection

• Preheat time: tph = 1----5C---0--C---nP----F-- × R-3----0R----R-k--E-Ω---F-

• Ignition time: tign = 11----56-- × tph

• Non-overlap time: tno = 1.4 µs × -R-3---R0----Rk---EΩ----F-

Product specification

UBA2021

2002 Aug 02

11

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