參數(shù)資料
型號(hào): L6585D
廠商: STMICROELECTRONICS
元件分類(lèi): 穩(wěn)壓器
英文描述: 0.6 A POWER FACTOR AND FLUORESCENT LIGHT CONTROLLER, 250 kHz SWITCHING FREQ-MAX, PDSO20
封裝: LEAD FREE, SOP-20
文件頁(yè)數(shù): 4/25頁(yè)
文件大小: 1478K
代理商: L6585D
Application information
L6585D
12/25
5
Application information
5.1
Start-up sequence
5.1.1
Pre-heating (time interval A Figure 5)
After IC turn-on, unless a lamp absence is detected, the oscillator starts switching at a
frequency (fPRE) set by values of COSC and RRUN and RPRE Figure 4:
Equation 1
The pre-heating time is:
Equation 2
where CD and RD are shown in Figure 4 and ICH is typically 34 A.
Figure 4.
Oscillator, pre-heating and ignition circuitry
f
PRE
1.328
C
OSC
R
RUN
R
PRE
||
()
------------------------------------------------------------
=
T
PRE
4.63
C
D
I
CH
---------
R
D
C
D
4.63
1.52
-----------
ln
+
=
RF
EOI
Tch
I
MAX
V
REF
LOGIC
R
RUN
R
PRE
C
IGN
R
D
C
D
C
OSC
OSC
RF
EOI
Tch
I
MAX
V
REF
LOGIC
R
RUN
R
PRE
C
IGN
R
D
C
D
C
OSC
OSC
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