L6585DE Datasheet PDF - STMicroelectronics

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L6585DE
STMicroelectronics

Part Number L6585DE
Description Combo IC
Page 30 Pages


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L6585DE
Combo IC for PFC and ballast control
Features
PFC section
– transition mode PFC with over-current
protection
– over-voltage protection
– feedback disconnection
– under-voltage lockout
– PFC choke saturation detection
– THD optimizer
Half-bridge section
– preheating and ignition phases
independently programmable
– 3 % oscillator precision
– 1.2 µs dead time
Figure 1. Block diagram
SO-20
– programmable and precise end-of-life
protection compliant with all ballast
configurations
– smart hard switching detection
– fast ignition voltage control with choke
saturation detection
– half-bridge over-current control
April 2009
Rev 2
1/33
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Contents
Contents
L6585DE
1 Pin settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.1 Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.2 Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2 Electrical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.1 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
4 Device description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5 Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
5.1 VCC section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
5.2 PFC section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
5.2.1 TM PFC operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
5.2.2 Leading edge blanking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5.2.3 THD optimizer feature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5.2.4 Over-voltage protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
5.2.5 Disabling the L6585DE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
5.2.6 Feedback disconnection protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
5.2.7 PFC over-current protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
6 Ballast section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
6.1 Half-bridge drivers and integrated bootstrap diode . . . . . . . . . . . . . . . . . 18
6.2 Normal start-up description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
6.3 Startup sequence with old or damaged lamps . . . . . . . . . . . . . . . . . . . . . 21
6.4 Old lamp management during run mode . . . . . . . . . . . . . . . . . . . . . . . . . 22
6.5 Rectifying effect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
6.6 Over-current protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
6.7 Hard switching protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
2/33
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L6585DE
Contents
6.8 Choke saturation protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
7 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
8 Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
9 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
3/33
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Pin settings
1 Pin settings
1.1 Connection
Figure 2. Pin connection (top view)
L6585DE
1.2
Functions
Table 1.
Pin n.
1
2
3
Pin functions
Name
Function
OSC
RF
EOI
An external capacitor to ground fixes the half-bridge switching frequency with a
± 3 % precision.
Voltage reference capable of sourcing up to 240 µA. The current sunk from this
pin fixes the switching frequency of the half-bridge for each operating state.
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) sets the maximum half-bridge switching
frequency during preheating combined with RRUN and COSC.
Connected to ground by a capacitor that, combined with RPRE, determines the
ignition time.
Preheating: low impedance to set high switching frequency
Ignition and run mode: high impedance with controlled current sink in case of
HBCS threshold triggering.
4/33
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