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参数资料
| 型号： | L6585D |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | 0.6 A POWER FACTOR AND FLUORESCENT LIGHT CONTROLLER, 250 kHz SWITCHING FREQ-MAX, PDSO20 |
| 封装： | LEAD FREE, SOP-20 |
| 文件页数： | 11/25页 |
| 文件大小： | 1478K |
| 代理商： | L6585D |
L6585D
Re–lamp
19/25
9
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 VCC
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.
Table 6.
IC configuration
Pre-heating
Ignition
Run mode
Time duration
TCH cycle
(1);
It depends on RD and CD
EOI charge from 0 to
1.9V (typ.);
It depends on RD and
CD
Until a fault appears or
the AC Mains is removed
Half-bridge switching
frequency
The frequency shifts
from fPRE to fRUN with
exponential trend
RELAMP comparator
ENABLED
CTR: PFC
overvoltage
ENABLED
CTR: disable function
ENABLED
Half-bridge current
sense
DISABLED
ENABLED
– low threshold
disabled
– high threshold
FSW increase
ENABLED
– low threshold
FSW increase
– high threshold
latch
EOL: window
comparator
DISABLED
ENABLED
PFC choke saturation
ENABLED
1.
TCH cycle: charge of the TCH voltage up to 4.63V and discharge down to 1.50V following the RDCD time constant
f
PRE
1.328
C
OSC
R
RUN
R
PRE
||
()
------------------------------------------------------------
=
f
RUN
1.328
R
RUN
C
OSC
-----------------------------------
=
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