L6585D_07 STMICROELECTRONICS [STMicroelectronics], L6585D_07 Datasheet - Page 19

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

L6585D
9
Table 6.
1. T
CTR: disable function
PFC choke saturation
RELAMP comparator
Half-bridge switching
Half-bridge current
CH
Time duration
EOL: window
overvoltage
comparator
CTR: PFC
frequency
cycle: charge of the T
sense
IC configuration
Re–lamp
A second comparator has been introduced on the pin EOL-R; a voltage higher than the
internal threshold is read as lamp absence so the chip suddenly stops switching, enters idle
mode (low consumption) and is ready for a new pre-heating/ignition sequence as soon as a
new lamp is inserted.
In this idle mode the consumption of the chip is reduced so that the current flowing through
the resistors (connected to the high voltage bus for the start-up) is enough to keep the V
voltage above the UVLO threshold.
After a re-lamp cycle (that is the EOL-R voltage is brought above 4.63V and then released
below), a new pre-heating/ignition sequence starts.
CH
f
voltage up to 4.63V and discharge down to 1.50V following the R
PRE
It depends on R
=
----------------------------------------------------------- -
C
T
Pre-heating
DISABLED
DISABLED
OSC
ENABLED
ENABLED
ENABLED
ENABLED
CH
cycle
⋅
(
R
1.328
RUN
D
(1)
and C
;
||
R
PRE
D
)
– low threshold
– high threshold
It depends on R
from f
EOI charge from 0 to
The frequency shifts
disabled
F
exponential trend
SW
DISABLED
1.9V (typ.);
ENABLED
ENABLED
ENABLED
ENABLED
ENABLED
PRE
Ignition
increase
C
to f
D
RUN
D
⇒
⇒
with
and
D
C
D
the AC Mains is removed
– low threshold
– high threshold
Until a fault appears or
time constant
f
F
latch
RUN
SW
Run mode
increase
ENABLED
ENABLED
ENABLED
ENABLED
ENABLED
ENABLED
=
---------------------------------- -
R
RUN
1.328
Re–lamp
⇒
⋅
⇒
C
OSC
19/25
CC