TARGET SPECIFICATION
This is preliminary information on a new product foreseen to be developed. Details are
subject to change without notice.
January 2006 Rev1 1/9
9
L6585D
PFC and Ballast Control IC
Features
■Pre-heating and igni tion phases independently
programmable
■Program m able and precise End-of -life
protection comp liant with all b allast
configurations
■Half-bridge over-current control
■Ignition voltage control
■Automatic Re-lamp
■1.25µs dead t ime
■3% Oscillator precision
■Transition mode PFC with over-current
protection
■PFC over-voltage protection and feedback
disconnection
■Under-volt age lock-out
Applications
■Electronic ball ast
SO-20
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Block diagram
Contents L6585D
2/9 Rev1
Contents
1 Technical Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2 Pin Connections and Internal Schematic . . . . . . . . . . . . . . . . . . . . . . . . 4
3 Mechanical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4 Order codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
5 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
L6585D Technical Overview
Rev1 3/9
1 Technical Overview
The L6585 is a ballast control I C with integrated Power Factor Corrector (PFC), designed in
High-voltag e BCD Off-line te ch nology. This one-c hip solution replaces a half bridge
controller, a PFC controller, the relevant drivers and the logic necessary to build an
electronic ballast.
The pre-heating and ignition durations are independently settable as w ell as the h alf-bridge
switching frequencies for each operating phase (pre-heating, ignition and normal mode) to
serve many diff erent lamp types. Another outstanding feature is the capability of limiting the
voltage applied to th e lamp to a constant va lue during the ignition phase.
The PFC section operates in Transition Mode. The highly linear multiplier includes a special
circuit, able to reduce AC input current distortion, that allows wide-range-mains operation
with an extremely low THD, even over a large load range.
Some IC features, like the under voltage lock-out and the PFC over-voltage and feedback
disconnection controls can assure lamp protection. Furthermore, a double threshold
comparator on the half bridge current sense provides a sort of current control and avoids the
MOSFETs working in the capacitive mode. A double threshold comparator on the PFC
current sense prevents the induct or saturation.
Other features like the aut om atic re-lamp for lamp re placing , the failure to strike and the
End-Of-Life control, simplify the lamp managem ent. Th e programmabi lity of the EOL
windows comparator thresholds makes the L6585 the only lighting IC compliant with either
"lamp-to-ground" or "block capacitor-to-ground" configurations.
The driver of the PFC is able to provide 120mA (source) and 250mA (sink) and the drivers
of th e half-bridge provide 170m A source and sink.
Pin Connection s and Internal Sche matic L6585D
4/9 Rev1
2 Pin Connections and Internal Schemat ic
Figure 1. Pin connection (through top view)
Figure 2. Typical System Block Diagram
BOOT
HSD
OUT
GND
LSD
VCC
C
OMP
INV ZCD
PFC C
S
PFG
HBCS
EOLP
E
OL-R
CTR
MULT
EOI
TCH
OSC
RF
L6585D Mechanical Data
Rev1 5/9
3 Mechanical Data
In order to meet environ men tal requirements, ST offers these dev ices in ECOPACK ®
packages. These p ackages have a Lead-free second level interconnect. The category of
second Level Interconnect is marked on the package and on the inner box label, in
compliance with JEDEC Standard JESD97. The maximum ratings related to soldering
conditions are also marked on the inner box label. ECOPACK is an ST trademark .
ECOPACK sp ecificatio ns are available at: www.st.com.
Mechanical Data L6585D
6/9 Rev1
Figure 3. Package Dimensions
Table 1. SO-20 Mechan ic al Data
Dimensions
Ref. mm. inch
Min. Typ. Max. Min. Typ. Max.
A 2.65 0.104
a1 0.1 0.2 0.004 0.008
a2 2.45 0.096
b 0.35 0.49 0.014 0.019
b1 0.23 0.32 0.009 0.012
C 0.5 0.020
c1 45° (typ.)
D 12.60 13.00 0.496 0.512
E 10.00 10.65 0.393 0.419
e 1.27 0.050
e3 11.43 0.450
F 7.40 7.60 0.291 0.300
L 0.50 1.27 0.020 0.050
M 0.75 0.029
S 8° (max.)
L6585D Order codes
Rev1 7/9
4 Order codes
Table 2. Or der co des
Part Number Package Shipment
L6585D SO-20 Tube
L6585DTR SO-20 Tape and Reel
Revis i on hi stor y L6585D
8/9 Rev1
5 Revision history
Table 3. Document revision history
Date Revision Changes
12-Jan-2006 1Initia l re le a s e.
L6585D Revi sion history
Rev1 9/9
I
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