L6585D_07 STMICROELECTRONICS [STMicroelectronics], L6585D_07 Datasheet - Page 5

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L6585D_07

Manufacturer Part Number
L6585D_07
Description
Combo IC for PFC and ballast control
Manufacturer
STMICROELECTRONICS [STMicroelectronics]
Datasheet
L6585D
2.2
Functions
Table 1.
Pin num. Name
1
2
3
4
5
6
7
8
EOL-R
EOLP
MULT
OSC
CTR
Pin functions
EOI
Tch
RF
An external capacitor to GND fixes the half-bridge switching frequency with a
±3% precision.
Voltage reference able to source up to 240µA; the current sunk from this pin fixes
the switching frequency of the half-bridge for each operating state.
A resistor (R
combined with the capacitor connected to the pin OSC.
A resistor connected to EOI (R
half-bridge switching frequency during pre-heating.
Connected to ground by a capacitor that, combined with R
ignition duration
Pre-heating: low impedance to set high switching frequency
Ignition and run mode: high impedance with controlled current sink in case of
HBCS threshold triggering.
Pin for setting the pre-heating time and the protection intervention.
Connect a RC parallel network (R
Pre-heating: the C
voltage reaches 4.63V the generator is disabled and the capacitor discharges
because of R
ignition phase starts and the R
Run mode: according to the kind of fault (either over-current or EOL) the
internal generator charges the RC parallel network and appropriate actions are
taken to stop the application. During proper behavior of the IC, this pin is low
impedance.
Pin to program the EOL comparator.
It is possible to select both the EOL sensing method and the window comparator
amplitude by connecting a resistor (R
Input for the window comparator and re-lamp function.
It can be used to detect the lamp ageing for either “lamp to ground” and “block
capacitor to ground” configurations.
According to the EOLP pin setting, it is possible to program:
– the window amplitude (V
– the center of the window (V
This function is blanked during the ignition phase.
In case of either lamp disconnection or removal, a second threshold (V
crossing latches the IC and drives the chip in “ready-mode” so that when the
voltage at EOL-R pin is brought below V
heating/ignition sequence is repeated.
Input pin for:
– PFC over-voltage detection: the PFC driver is stopped until the voltage returns
– Feedback disconnection detection
– reference for End-of-life in case tracking reference;
– shut-down: forcing the pin to a voltage lower than 0.75V, the IC shuts down in
Main input to the multiplier. This pin is connected to the rectified mains voltage
via a resistor divider and provides the sinusoidal reference to the PFC current
loop.
bus.
in the proper operating range
unlatched condition.
RUN
D
; once the voltage drops below 1.52V, the preheating finishes, the
) connected to ground sets the half-bridge operating frequency
D
is charged by an internal current generator. When the pin
W
)
SET
PRE
D
C
) either fixed or in tracking with the PFC output
D
D
) – in parallel with R
Function
and C
is discharged to ground.
EOLP
SL-DOWN
D
) to ground.
) to ground
(re-lamp) a new pre-
RUN
PRE
– sets the maximum
, determines the
Pin settings
SL-UP
)
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