L6585D_07 STMICROELECTRONICS [STMicroelectronics], L6585D_07 Datasheet - Page 12

• Manufacturer Part Number: L6585D_07
• Description: Combo IC for PFC and ballast control
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

Application information
5
5.1
5.1.1
12/25
Application information
Start-up sequence
Pre-heating (time interval A
After IC turn-on, unless a lamp absence is detected, the oscillator starts switching at a
frequency (f
Equation 1
The pre-heating time is:
Equation 2
where C
Figure 4.
D
and R
PRE
Oscillator, pre-heating and ignition circuitry
) set by values of C
D
are shown in
R
R
RUN
RUN
C
C
IGN
IGN
C
C
C
C
T
D
D
OSC
OSC
PRE
f
Figure 4
PRE
R
R
D
D
OSC
=
R
R
Figure
OSC
OSC
=
PRE
PRE
4.63
----------------------------------------------------------- -
C
and R
OSC
and I
⋅
-------- -
I
C
CH
D
⋅
5)
RF
RF
EOI
EOI
Tch
Tch
RUN
(
CH
+
R
1.328
R
RUN
is typically 34 µA.
D
and R
⋅
C
||
R
D
PRE
⋅
PRE
ln
I
I
MAX
MAX
4.63
---------- -
1.52
)
Figure
LOGIC
LOGIC
V
V
REF
REF
4:
L6585D