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參數(shù)資料
| 型號(hào)： | L6567D |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | HIGH VOLTAGE DRIVER FOR CFL |
| 中文描述： | 高壓驅(qū)動(dòng)節(jié)能燈 |
| 文件頁數(shù)： | 9/15頁 |
| 文件大?。?/td> | 115K |
| 代理商： | L6567D |
9/15
L6567
Other easy formulas fit rather well:
T
DT
46.75 · 10
^-12
· R
REF
T
PRE
224 · C
P
· R
REF
As far as df/dt is concerned, there are no easy formulas that fitthe relation between C
F
, R
F
, and C
I
. C
I
is charged
and discharged by three different currents that are derived from different mirroring ratios by the current flowing
on R
REF
. The voltage variations on C
I
are proportional to the current that charges C
F
, that is to say they are
proportional to df/dt.
The values obtained in the testing conditions (C
I
= 100nF) are:
during preheating and working conditions the typical frequency increase is ~ 20KHz/ms, the typical decrease is
~-10Khz/ms;
During ignition the frequency variation is ~ -200Hz/ms.
If slower variations are needed, CI has to be increased.
Due to these tight relationships, it is recommended to follow a precise procedure: first R
HV
has to be chosen
looking at startup current needs and dissipation problems. Then the feed forward frequency range has to be
determined, and so C
F
is set.
Given a certain C
F
, R
REF
is set in order to fix F
MIN
. Now C
P
can be chosed to set the desired T
PRE
and T
IGN
.
The other external parameters (R
SHUNT
and C
I
) can be chosen at the end because they are just related to a
single circuit parameters.
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