UBA2025T データシートの表示（PDF） - NXP Semiconductors.

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UBA2025T

CFL power IC

NXP Semiconductors. 

NXP Semiconductors

UBA2025

CFL power IC

11. Application information

11.1 Design equations

• Bottom frequency:

f btm = -2----×-----[--(---C-----f---+-----C-----p--a---r--)----×-----(--X--1---1----×-----R----I--R---E---F----–-----R----i-n---t--)--]----+-----t(Hz)

• Feed forward frequency:

f ff = 2-----×--------(--C-----f---+-----C-----p---a--r---)---×---------X--------2--------1-×-----V-----V---i---(---r-V---e---D-f------C-×------)----R--------H-------V------–-----R----i-n---t--------+-----t(Hz)

Where:

– X1 = 3.68

– X2 = 22.28

– t = 0.4 µs

– Rint = 3 kΩ

– Cpar = 4.7 pF

– Vref = 2.5 V

– Vi(VDC) = 300 V (nominal)

– RHV = 560 KΩ (see Figure 6)

• Operating frequency = fbtm(max), fff(max), and fcm(max)

Where:

– fbtm = bottom frequency

– fff(max) = maximum feed forward frequency

– fcm(max) = maximum frequency due to capacitive mode detection

• Preheat time:

t ph = 1----5-C--0--C---nP---F-- × 3---R-0---r--ke---fΩ---(s)

• Ignition time:

tign = 11----56- × t ph(s)

• Non-overlap time:

tno = 1.4 µs × 3---R0----r--ke---fΩ---

UBA2025_1

Product data sheet

Rev. 01 — 16 October 2009

© NXP B.V. 2009. All rights reserved.

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