L6585D
Combo IC for PFC and ballast control
Features
■Pre-heating and ignition phases independently programmable
■Ignition voltage control
■Transition mode PFC with over-current protection
■Programmable and precise End-of-life protection compliant with all ballast configurations
■Auto-adjusting half-bridge over-current control
■Automatic re-lamp
■3% oscillator precision
■1.2µs dead time
■PFC over-voltage protection and feedback disconnection
■Under voltage lock-out
SO-20
Applications
■ Electronic ballast
Figure 1. Block diagram
|
COMP |
MULT |
|
PFCS |
|
|
Vcc |
|
|
|
|
2.5V |
E/A |
|
|
|
|
|
|
|
|
|
|
|
MULTIPLIER |
|
LEB |
|
|
|
|
|
|
|
|
|
+ |
|
|
1.7V |
|
|
|
|
BOOT |
||
|
_ |
and THD |
|
|
|
|
|
|
|
|
|
INV |
|
|
|
|
|
17V |
|
|
|
||
|
OPTIMIZER |
|
|
|
|
|
|
HVG |
|
||
|
|
|
+ |
+ |
_ |
|
UV |
|
HSD |
||
|
|
|
_ |
|
SYNCHRONOUS |
DRIVER |
|||||
|
|
|
PWM |
|
|
|
DETECTION |
|
|||
|
|
|
|
|
|
|
|
||||
1.2V |
OL |
|
|
COMP. |
|
|
|
BOOTSTRAP DIODE |
|
OUT |
|
|
|
|
CHOKE |
|
|
|
|||||
|
|
|
|
DEAD |
|
|
|||||
ZCD |
|
|
|
|
|
SAT. |
|
LEVEL |
|
||
|
|
|
|
|
|
|
TIME |
DRIVING |
SHIFTER |
Vcc |
|
|
|
S |
R |
|
|
|
|
|
|||
|
|
|
|
|
|
|
|
|
|||
|
|
|
|
|
|
|
|
|
|
||
0.7V |
STARTER |
Q |
|
|
|
|
|
LATCH |
LOGIC |
LVG DRIVER |
|
Vcc |
|
|
|
|
|
|
LSD |
||||
|
|
|
|
|
|
OVP |
|
|
|
||
|
|
|
|
|
|
CONTROL |
|
1.6V |
|
||
PFG |
|
PFSTOP |
WINDOW |
|
PFSTOP |
HB STOP |
GND |
||||
|
|
|
DIS |
|
|
||||||
|
|
|
|
|
|
|
|||||
|
|
COMPARATOR |
|
|
LOGIC |
|
|
||||
|
|
|
EOL |
|
|
|
|
||||
CTR |
|
|
|
& REF. |
|
|
|
|
|
||
OL |
|
|
|
|
|
|
|
|
|
||
|
|
|
|
|
|
|
|
|
|
HBCS |
|
|
OVP |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
3.4V |
|
|
|
|
|
|
|
1.9V |
TIMING |
|
0.9V |
DIS |
|
|
|
|
|
|
|
|
|||
|
|
|
|
|
|
|
|
MANAGEMENT |
Vcc |
||
|
|
|
|
|
|
|
|
|
|
|
|
0.75V |
2V |
|
2V |
|
|
|
|
|
|
4.6 |
|
|
|
|
|
|
|
|
|
|
|
||
|
|
|
|
VCO |
|
|
|
1.5 |
|
||
EOLR |
|
|
|
|
|
|
|
|
|||
|
|
|
|
|
|
|
|
|
|||
|
|
|
|
|
|
|
|
|
|
|
|
4.63V |
RELAMP |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
EOLP |
|
RF |
OSC |
EOI |
|
|
|
Tch |
|
May 2007 |
|
|
|
|
|
Rev 5 |
|
|
1/25 |
||
|
|
|
|
|
|
|
|
|
|
|
www.st.com |
Contents |
L6585D |
|
|
Contents
1 |
Device description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. 3 |
||
2 |
Pin settings |
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
4 |
|
|
2.1 |
Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
4 |
|
|
2.2 |
Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
5 |
|
3 |
Electrical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
7 |
||
|
3.1 |
Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
7 |
|
|
3.2 |
Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
7 |
|
4 |
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
8 |
||
5 |
Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
12 |
||
|
5.1 |
Start-up sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
12 |
|
|
|
5.1.1 |
Pre-heating (time interval A Figure 5) . . . . . . . . . . . . . . . . . . . . . . . . . . |
12 |
|
|
5.1.2 |
Ignition (time interval B Figure 5) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
13 |
|
|
5.1.3 |
Run mode (time interval C Figure 5) . . . . . . . . . . . . . . . . . . . . . . . . . . . |
14 |
6 |
End of life – window comparator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
15 |
||
7 |
Half-bridge current control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
17 |
||
8 |
CTR . |
. . . . . . . |
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
18 |
9 |
Re–lamp . . . . |
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
19 |
|
10 |
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
21 |
||
11 |
Order codes . |
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
23 |
|
12 |
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
24 |
2/25
L6585D |
Device description |
|
|
Designed in High-voltage BCD Off-line technology, the L6585D embeds a PFC controller, a half-bridge controller, the relevant drivers and the logic necessary to build an electronic ballast.
The advanced and precise logic circuitry, combined with the programmability of the End-of- Life windows comparator threshold, makes the L6585D compliant with either "lamp-to- ground" or "block capacitor-to ground" configurations.
Another outstanding feature is the possibility of controlling and limiting the lamp voltage during the ignition phase.
The pre-heating and ignition durations are independently settable as well as the half-bridge switching frequencies for each operating phases (pre-heating, ignition and normal mode).
Other features (half-bridge over-current with frequency increase, PFC over-voltage) allow building a reliable and flexible solution with a reduced part count.
The PFC section achieves current mode control operating 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.
The PFC output voltage is controlled by means of a voltage-mode error amplifier and a precise internal voltage reference.
The driver of the PFC is able to provide 300mA (source) and 600mA (sink) and the drivers of the half-bridge provide 290mA source and 480mA sink.
Figure 2. Typical system block diagram
|
LPFC |
|
|
|
|
|
|
|
|
|
HV BUS |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
R5 |
|
R7 |
|
R1 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
CBULK |
|
|
|
|
|
|
|
Charge |
|
|
|
R4 |
|
R6 |
|
|
R8 |
|
|
|
pump |
|
R2 |
|
|
CCOMP |
|
|
|
|
|
|
|||
|
|
|
|
|
|
|
CBOOT |
|
||||
|
|
|
|
|
|
|
|
|
|
|
|
|
AC MAINS |
|
ZCD |
INV |
COMP |
|
CTR |
Vcc |
BOOT |
|
|||
|
|
|
|
|||||||||
|
PFG |
11 |
|
10 |
9 |
|
7 |
|
17 |
2019 |
|
|
|
13 |
|
|
|
|
|
HSD |
LB |
||||
|
|
|
|
|
|
|
|
|
|
|||
CIN |
|
|
|
|
L6585D |
|
|
|
|
|||
|
|
|
|
|
|
|
18 |
|
|
|||
|
|
12 |
|
|
|
|
|
OUT |
|
|||
|
PFCS |
|
|
|
|
|
|
|
||||
|
|
|
|
|
|
|
|
|
|
|
||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
8 |
|
|
|
|
|
|
|
16 |
LSD |
CRES |
|
MULT |
15 |
1 |
2 |
3 |
|
4 |
5 |
6 |
14 |
LAMP |
|
|
|
GND |
OSC |
RF |
EOI |
Tch |
EOLP |
|
EOL-R |
HBCS |
|
|
R3 |
RSNSPF |
|
|
RPRE |
|
|
|
|
|
|
|
|
|
|
|
COSC |
RRUN |
RD |
CD |
|
RP |
|
RSNSHB |
CBLOCK |
|
|
|
|
|
CIGN |
|
|
|
|
|
3/25
Pin settings |
L6585D |
|
|
Figure 3. Pin sonnection (Top view)
OSC |
|
|
|
BOOT |
|
|
|
||
|
|
|
||
|
|
|
||
RF |
|
|
|
HSD |
|
|
|
||
|
|
|
||
EOI |
|
|
|
OUT |
|
|
|
||
|
|
|
||
TCH |
|
|
|
VCC |
|
|
|
||
|
|
|
||
EOLP |
|
|
|
LSD |
|
|
|
||
|
|
|
||
EOL-R |
|
|
|
GND |
|
|
|
||
|
|
|
||
CTR |
|
|
|
HBCS |
|
|
|
||
|
|
|
||
MULT |
|
|
|
PFG |
|
|
|
||
|
|
|
||
COMP |
|
|
|
PFCS |
|
|
|
||
|
|
|
||
INV |
|
|
|
ZCD |
|
|
|
||
|
|
|
||
|
|
|
|
|
|
|
|
|
|
4/25
L6585D |
Pin settings |
|
|
Table 1. |
Pin functions |
||
Pin num. |
Name |
Function |
|
|
|
|
|
1 |
OSC |
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. |
|
2 |
RF |
A resistor (RRUN) connected to ground sets the half-bridge operating frequency |
|
|
|
combined with the capacitor connected to the pin OSC. |
|
|
|
A resistor connected to EOI (RPRE) – in parallel with RRUN – sets the maximum |
|
|
|
half-bridge switching frequency during pre-heating. |
|
|
|
|
|
|
|
Connected to ground by a capacitor that, combined with RPRE, determines the |
|
|
|
ignition duration |
|
3 |
EOI |
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 (RD and CD) to ground |
|
|
|
Pre-heating: the CD is charged by an internal current generator. When the pin |
|
|
|
voltage reaches 4.63V the generator is disabled and the capacitor discharges |
|
4 |
Tch |
because of RD; once the voltage drops below 1.52V, the preheating finishes, the |
|
|
|
ignition phase starts and the RDCD is discharged to ground. |
|
|
|
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. |
|
5 |
EOLP |
It is possible to select both the EOL sensing method and the window comparator |
|
|
|
amplitude by connecting a resistor (REOLP) to ground. |
|
|
|
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 (VW) |
|
6 |
EOL-R |
– the center of the window (VSET) either fixed or in tracking with the PFC output |
|
|
|
bus. |
|
|
|
This function is blanked during the ignition phase. |
|
|
|
In case of either lamp disconnection or removal, a second threshold (VSL-UP) |
|
|
|
crossing latches the IC and drives the chip in “ready-mode” so that when the |
|
|
|
voltage at EOL-R pin is brought below VSL-DOWN (re-lamp) a new pre- |
|
|
|
heating/ignition sequence is repeated. |
|
|
|
|
|
|
|
Input pin for: |
|
|
|
– PFC over-voltage detection: the PFC driver is stopped until the voltage returns |
|
7 |
CTR |
in the proper operating range |
|
– 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 |
|
|
|
unlatched condition. |
|
|
|
|
|
|
|
Main input to the multiplier. This pin is connected to the rectified mains voltage |
|
8 |
MULT |
via a resistor divider and provides the sinusoidal reference to the PFC current |
|
|
|
loop. |
|
|
|
|
5/25
Pin settings |
|
L6585D |
|
|
|
|
|
|
Table 1. |
Pin functions (continued) |
|
|
|
|
|
|
Pin num. |
Name |
Function |
|
|
|
|
|
|
|
Output of the error amplifier. A compensation network is placed between this pin |
|
9 |
COMP |
and INV to achieve stability of the PFC voltage control loop and ensure high |
|
|
|
power factor and low THD. |
|
|
|
|
|
|
|
Inverting input of the error amplifier. The information on the output voltage of the |
|
10 |
INV |
PFC pre-regulator is fed into the pin through a resistor divider. Input for the |
|
|
|
feedback disconnection comparator |
|
|
|
|
|
|
|
Boost inductor’s demagnetization sensing input for PFC transition-mode |
|
|
|
operation. A negative-going edge triggers PFC MOSFET turn-on. |
|
11 |
ZCD |
During start-up or when the voltage is not high enough to arm the internal |
|
|
|
comparator (e.g. AC Mains peak), the PFC driver is triggered by means of an |
|
|
|
internal starter. |
|
|
|
|
|
|
|
Input to the PFC PWM comparator. The current flowing in the PFC mosfet is |
|
|
|
sensed by a resistor; the resulting voltage is applied to this pin and compared |
|
|
|
with an internal sinusoidal-shaped reference, generated by the multiplier, to |
|
12 |
PFCS |
determine the PFC MOSFET’ s turn-off. |
|
A second comparison level detects abnormal currents (e.g. due to boost inductor |
||
|
|
|
saturation) and, on this occurrence, shuts down and latches the IC reducing its |
|
|
|
consumption to the start-up. |
|
|
|
An internal LEB prevents undesired function triggering. |
|
|
|
|
|
13 |
PFG |
PFC gate driver output. The totem pole output stage is able to drive power |
|
MOSFET’S with a peak current of 300mA source and 600mA sink. |
||
|
|
|
|
|
|
|
|
|
|
|
2-levels half-bridge current monitor for current control. |
|
|
|
The current flowing in the HB mosfet is sensed by a resistor; the resulting |
|
|
|
voltage is applied to this pin. |
|
|
|
Low threshold (active during run mode): in case of thresholds crossing, the IC |
|
|
|
reacts with self-adjusting frequency increase in order to limit the half-bridge |
|
14 |
HBCS |
(lamp) current. |
|
|
|
High threshold: |
|
|
|
– ignition: in case of thresholds crossing during the frequency shift, the IC reacts |
|
|
|
with self-adjusting frequency increase in order to limit the lamp voltage and |
|
|
|
preventing operation below resonance. |
|
|
|
– run mode: in case of thresholds crossing because of current spikes (due e. g. |
|
|
|
to capacitive mode / cross-conduction), the L6585D latches to avoid |
|
|
|
MOSFETs damaging, |
|
|
|
|
|
15 |
GND |
Ground. Current return for both the signal part of the IC and the gate driver. |
|
|
|
|
|
16 |
LSD |
Low side driver output: the output stage can deliver 290mA source and 480mA |
|
sink (typ. values). |
||
|
|
|
|
|
|
|
|
|
17 |
VCC |
Supply Voltage of both the signal part of the IC and the gate driver. |
|
Clamped with a Zener inside. |
||
|
|
|
|
|
|
|
|
|
18 |
OUT |
High Side Driver Floating Reference. This pin must be connected close to the |
|
source of the high side power MOS. |
||
|
|
|
|
|
|
|
|
|
19 |
HSD |
High side driver output: the output stage can deliver 290mA source and 480mA |
|
(typ. values). |
||
|
|
|
|
|
|
|
|
|
|
|
Bootstrapped Supply Voltage. Between this pin and VCC, the bootstrap capacitor |
|
20 |
BOOT |
must be connected. |
|
A patented integrated circuitry replaces the external bootstrap diode, by means |
||
|
|
|
|
|
|
|
of a high voltage DMOS, synchronously driven with the low side power MOSFET. |
|
|
|
|
6/25
L6585D |
Electrical data |
|
|
Table 2. |
Absolute maximum ratings |
|
|
|
Symbol |
Pin |
Parameter |
Value |
Unit |
|
|
|
|
|
VBOOT |
20 |
Floating supply voltage |
-1 to 618 |
V |
VOUT |
18 |
Floating ground voltage |
-3 to VBOOT – 18 |
V |
dVOUT /dt |
18 |
Floating ground max. slew rate |
50 |
V/ns |
VCC |
17 |
IC Supply voltage (ICC = 20mA)(1) |
Self-limited |
V |
|
1, 3, 4, |
|
|
|
|
8, 10, |
Analog input and outputs |
-0.3 to 5 |
V |
|
12 |
|
|
|
|
|
|
|
|
|
2, 5 |
|
-0.3 to 2.7 |
V |
|
|
|
|
|
|
6 |
|
Vcc |
|
|
|
|
|
|
|
7 |
|
-0.3 to 7 |
V |
|
|
|
|
|
|
14 |
|
-5 to 5 |
|
|
|
|
|
|
|
9, 11 |
ZCD clamp (IZCD < 4mA) |
Self-limited |
|
IRF |
2 |
Current capability |
240 |
µA |
IEOLP |
5 |
Current capability |
100 |
µA |
FOSC(MAX) |
|
Maximum operating frequency |
250 |
KHz |
PTOT |
|
Power dissipation @TA = 70°C |
0.83 |
W |
1.The device has an internal Clamping Zener between GND and the VCC pin, it must not be supplied by a Low Impedance Voltage Source.
Note: |
ESD immunity for pins 18, 19 and 20 is guaranteed up to 900V (Human Body Model) |
3.2Thermal data
Table 3. |
Thermal data |
|
|
Symbol |
Description |
Value |
Unit |
|
|
|
|
RthJA |
Max. thermal resistance junction to ambient |
120 |
°C/W |
TJ |
Junction operating temperature range |
-40 to 150 |
°C |
TSTG |
Storage temperature |
-55 to 150 |
°C |
7/25
Electrical characteristics |
L6585D |
|
|
|
|
VCC = 15V, TA = 25°C, CL = 1nF, COSC = 470pF, RRUN = 47K, unless otherwise specified |
|||||||
Table 4. |
Electrical characteristics |
|
|
|
|
|
|||
|
|
|
|
|
|
|
|
|
|
Symbol |
|
Pin |
Parameter |
Test condition |
Min |
Typ |
Max |
Unit |
|
|
|
|
|
|
|
|
|
|
|
Supply voltage |
|
|
|
|
|
|
|||
|
|
|
|
|
|
|
|
|
|
|
Vcc |
|
VCC |
Operating range |
After turn-on |
11 |
|
16 |
V |
|
VCC(on) |
|
VCC |
Turn-on threshold |
(1) |
13.6 |
14.3 |
15 |
V |
|
|
|
|||||||
VCC(OFF) |
|
VCC |
Turn-off threshold |
(1) |
9.6 |
10.3 |
11 |
V |
|
|
|
||||||||
|
VZ |
|
VCC |
Zener Voltage |
Icc = 20mA |
16.2 |
17.2 |
17.7 |
V |
Supply current |
|
|
|
|
|
|
|||
|
|
|
|
|
|
|
|
|
|
|
IST-UP |
|
VCC |
Start-up current |
Before turn-on @ 13V |
|
250 |
370 |
µA |
|
ICC |
|
VCC |
Operating supply current |
|
|
7 |
|
mA |
|
Iq |
|
VCC |
Residual current |
IC latched |
|
|
370 |
µA |
PFC section – multiplier input |
|
|
|
|
|
||||
|
|
|
|
|
|
|
|
|
|
|
IMULT |
|
MULT |
Input bias current |
VMULT = 0 |
|
|
-1 |
µA |
|
VMULT |
|
MULT |
Linear operation range |
VCOMP = 3V |
0 to 3 |
|
|
V |
|
∆VCS |
|
MULT |
Output max. slope |
VMULT = 0 to 1V, |
|
0.75 |
|
V/V |
|
∆VMULT |
|
VCOMP = Upper clamp |
|
|
||||
|
|
|
|
|
|
|
|
||
|
KM |
|
MULT |
Gain |
VMULT = 1V, VCOMP= 3V |
|
0.52 |
|
1/V |
PFC section – error amplifier |
|
|
|
|
|
||||
|
|
|
|
|
|
|
|
|
|
|
VINV |
|
INV |
Voltage feedback input |
|
2.45 |
2.5 |
2.55 |
V |
|
|
threshold |
|
||||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
INV |
Line regulation |
VCC = 10.3V to 16V |
|
|
50 |
mV |
|
IINV |
|
INV |
Input bias current |
|
|
|
-1 |
µA |
|
|
|
|
|
|
|
|
|
|
|
Gv |
|
INV |
Voltage gain |
Open loop (2) |
60 |
80 |
|
dB |
|
GB |
|
INV |
Gain-bandwidth product |
(2) |
|
1 |
|
MHz |
|
|
|
|
|
|
|
|
|
|
|
ICOMP |
|
COMP |
Source current |
VCOMP = 4V, VINV = 2.4 V |
|
-2.6 |
|
mA |
|
|
|
|
Sink current |
VCOMP = 4V, VINV = 2.6 V |
|
4 |
|
mA |
|
VCOMP |
|
COMP |
Upper clamp voltage |
ISOURCE = 0.5 mA |
|
4.2 |
|
V |
|
|
|
|
Lower clamp voltage |
ISINK = 0.5 mA |
|
2.25 |
|
V |
|
VDIS |
|
INV |
Open loop detection |
CTR > 3.4 |
|
1.2 |
|
V |
|
|
threshold |
|
|
|||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
COMP |
Static OVP threshold |
|
2.1 |
2.25 |
2.4 |
V |
|
|
|
|
|
|
|
|
|
|
8/25