ST L6585DE User Manual

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

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

Figure 1. Block diagram

April 2009

Rev 2

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www.st.com

Contents	L6585DE

Contents

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

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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

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Pin settings	L6585DE

1 Pin settings

1.1Connection

Figure 2. Pin connection (top view)

1.2Functions

	Table 1.	Pin functions
	Pin n.	Name	Function
	1	OSC	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.
	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) 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.
	3	EOI	Preheating: low impedance to set high switching frequency
			Ignition and run mode: high impedance with controlled current sink in case of
			HBCS threshold triggering.

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L6585DE			Pin settings
	Table 1.	Pin functions (continued)
	Pin n.	Name	Function
			Pin for setting the preheating time and protection intervention.
			Connect an RC parallel network (Rd and Cd) to ground.
			Preheating: the Cd is charged by an internal current generator. When the pin
			voltage reaches 4.63 V the generator is disabled and the capacitor discharges
	4	Tch	because of Rd. Once the voltage drops below 1.5 V, the preheating finishes, the
			ignition phase starts and the RdCd is pulled to ground.
			Ignition and Run mode: During proper behavior of the IC, this pin is low
			impedance. During a fault (either over-current or EOL) the internal generator
			charges the Cd to 4.63 V and then another current generator discharges the
			same capacitor. In this way, Cd sets the fault timing (shorter than preheating
			time).
			Pin to program the EOL comparator.
	5	EOLP	It is possible to select both the EOL sensing method (fixed reference or
			reference in tracking with CTR) and the window comparator amplitude by
			connecting a resistor (REOLP) to ground.
			Input for the window comparator.
	6	EOL	It can be used to detect lamp ageing for either “lamp to ground” or “block
			capacitor to ground” configurations.
			This function is blanked during the ignition phase.
			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 EOL comparator (in case tracking reference)
			- The pin can be used also for shutdown
	8	MULT	Multiplier external input. This pin is connected to the rectified mains voltage via a
			voltage divider and provides the sinusoidal reference to the PFC current loop.
			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.
	10	INV	Inverting input of the error amplifier. Output voltage of the PFC pre-regulator is
			fed to the pin through a voltage divider.
			Boost inductor demagnetization sensing input for PFC transition-mode
	11	ZCD	operation. A negative-going edge triggers PFC MOSFET turn-on.
			During startup or when the voltage is not high enough to arm the internal
			comparator, the PFC driver is triggered by means of an internal starter.
			Input to the PFC PWM comparator. The current flowing through the PFC
			MOSFET is sensed through a resistor. The resulting voltage is applied to this pin
			and compared with an internal sinusoidal-shaped reference, generated by the
	12	PFCCS	multiplier, to determine the PFC MOSFET’ s turnoff.
			A second comparison level detects abnormal currents (due to boost inductor
			saturation, for example) and, on this occurrence, shuts down the PFC gate.
			An internal LEB prevents undesired function triggering.

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Pin settings			L6585DE
	Table 1.	Pin functions (continued)
	Pin n.	Name	Function
	13	PFG	PFC gate driver output. The totem pole output stage is able to drive power
			MOSFETs with a peak current of 300 mA source and 600 mA sink (typ. values).
			3-level half-bridge current monitor for current control.
			The current flowing through the HB MOSFET is sensed through a resistor. The
			resulting voltage is applied to this pin.
			First level threshold (1.05 V, active during run mode): in case of threshold
			crossing the IC reacts with frequency increase in order to limit the half-bridge
			(and lamp) current.
			Second level threshold (1.6 V, active during ignition and run mode):
			- Ignition: in case of threshold crossing during the frequency shift, the IC reacts
			with frequency increase in order to limit the lamp voltage and preventing
			operation below resonance.
	14	HBCS	- Run mode: in case of threshold crossing because of current spikes (due, for
			example, to capacitive mode / cross-conduction) longer than 200 ns the
			L6585DE is latched in low consumption mode to avoid damage to the
			MOSFETs.
			Third level threshold (2.75 V, active during ignition and run mode):
			- Ignition: in case of threshold crossing during frequency shift (e.g. caused by
			choke saturation), the IC latches to avoid damage to the MOSFETs.
			- Run mode: in case of threshold crossing by a hard switching event (spike
			duration equal to around 40 ns) an internal counter is increased. After around
			350 (typ.) subsequent hard switching events the IC is latched in low consumption
			mode.
	15	GND	Ground.
	16	LSD	Low side driver output: the output stage can deliver 290 mA source and 480 mA
			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 MOSFET.
	19	HSD	High-side driver output: the output stage can deliver 290 mA source and 480 mA
			sink (typ. values).
			Bootstrapped supply voltage. Bootstrap capacitor must be connected between
	20	BOOT	this pin and OUT pin.
			Patented, integrated circuitry replaces the external bootstrap diode by means of
			a high voltage DMOS, synchronously driven with the low side power MOSFET.

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L6585DE	Electrical data

2 Electrical data

2.1Maximum ratings

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 = 20 mA)(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
VEOL	6	Maximum EOL voltage	-0.3 to VCC	V
VCTR	7	Maximum CTR voltage	-0.3 to 7	V
VHBCS	14	Maximum half-bridge current sense voltage	-5 to 5	V
	9, 11		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 900 V (human body model)

2.2Thermal 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

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Electrical characteristics	L6585DE

3 Electrical characteristics

			VCC = 15 V, TA = 25 °C, CL = 1 nF, COSC = 470 pF, RRUN = 47 kΩ, 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
						Icc = 20 mA, TA = 25 °C	16.7	17.1	17.5	V
	VZ			VCC	Zener voltage
						Icc = 20 mA, full	16	17.1	18	V
						temperature range
Supply current
	IST-UP			VCC	Start-up current	Before turn-on @ 13 V		250	370	µA
	ICC			VCC	Operating supply current	Fpfc = 50 kHz		7		mA
	Iq			VCC	Residual current	IC latched			350	µA
PFC section – multiplier input
	IMULT			MULT	Input bias current	VMULT = 0 V			-1	µA
	VMULT			MULT	Linear operation range	VCOMP = 3 V	0 to 3			V
	VCS			MULT	Output max. slope	VMULT = 0 to 1 V,		0.75		V/V
	VMULT					VCOMP = Upper clamp
	KM			MULT	Gain	VMULT = 1 V, VCOMP= 3 V		0.52		1/V
PFC section – error amplifier
	VINV			INV	Voltage feedback input		2.47	2.52	2.57	V
					threshold
				INV	Line regulation	VCC = 10.3 V to 16 V			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 V		1.2		V
					threshold
				COMP	Static OVP threshold		2.1	2.25	2.4	V

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L6585DE					Electrical characteristics
Table 4.	Electrical characteristics (continued)
Symbol		Pin	Parameter	Test condition	Min.	Typ.	Max.	Unit
CTR pin
DIS		CTR	Shutdown threshold	Falling edge		0.75		V
			Hysteresis			120		mV
			Dynamic PFC over-	Rising edge		3.4		V
PFOV		CTR	voltage
			Hysteresis			140		mV
				Lower threshold (falling)		1.7		V
		CTR	Available range as	Hysteresis		120		mV
			tracking reference
				Higher threshold (rising)		3.4		V
				Hysteresis		140		mV
PFC section – current sense comparator
ICS		PFCS	Input bias current	VCS = 0 V			-1	µA
tLEB		PFCS	Leading edge blanking	(2)	100	200	300	ns
VCSstop		PFCS	PFC stop threshold	VCTR	1.65	1.75	1.85	V
td(H-L)		PFCS	Delay to output			120		ns
VCSclamp		PFCS	Current sense reference	VCOMP = Upper clamp	1	1.08	1.16	V
			clamp
PFC section – zero current detector
VZCDH		ZCD	Upper clamp voltage	IZCD = 2.5 mA	5			V
VZCDL		ZCD	Lower clamp voltage	IZCD = -2.5 mA	-0.3	0	0.3	V
VZCDA		ZCD	Arming voltage	(2)		1.4		V
			(positive-going edge)
VZCDT		ZCD	Triggering voltage	(2)		0.7		V
			(negative-going edge)
IZCDb		ZCD	Input bias current	VZCD = 1 to 4.5 V			1	µA
IZCDsrc		ZCD	Source current capability		-4			mA
IZCDsnk		ZCD	Sink current capability		4			mA
PFC section – gate driver
		PFG	Output high/low	ISINK = 10 mA			0.2	V
				ISOURCE = 10 mA	14.5			V
tf		PFG	Fall time			40	90	ns
tr		PFG	Rise time			90	140	ns
ISINK		PFG	Peak sink current		475	600		mA
ISOURCE		PFG	Peak source current		200	300		mA
		PFG	Pull-down resistor			10		kΩ

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Electrical characteristics								L6585DE
Table 4.	Electrical characteristics (continued)
Symbol		Pin	Parameter	Test condition		Min.	Typ.	Max.	Unit
Half bridge section – timing and oscillator
ICH		TCH	Charge current	VTCH = 2.2 V			31		µA
VCHP		TCH	Charge threshold	(1)		4.53	4.63	4.73	V
			(positive going-edge)
VCHN		TCH	Discharge threshold	(1)			1.50		V
			(negative going edge)
		TCH	Leakage current	1.5 V < VTCH < 4.5 V,				0.1	µA
				falling
				During protection:
ICHsnk		TCH	Discharge current	reduced timing			26		µA
				VTCH = 3 V
RTCH		TCH	Internal impedance	Run mode			100	200	Ω
		EOI	Open state current	VEOI = 2 V				0.15	µA
REOI		EOI	EOI impedance	During preheating				150	Ω
				Tspike = 200 ns (3)			20
			EOI current generator
				Tspike = 400 ns	(3)		100
IEOI		EOI	during ignition and run						µA
				Tspike = 600 ns (3)			200
			mode
				Tspike = 1 µs (3)			270
VEOI		EOI	EOI threshold	(1)		1.83	1.9	1.98	V
VREF		RF	Reference voltage	(1)		1.92	2	2.08	V
IRF		RF	Max current capability			240			µA
IOSCratio		OSC	IOSC/IRF	VOSC = 3 V			4
		OSC	Rising threshold	(1)			3.7		V
		OSC	Falling threshold	(1)			0.9		V
D		OSC	Output duty cycle			48	50	52	%
TDEAD		OSC	Dead time			0.96	1.2	1.44	µs
FRUN		OSC	Half-bridge oscillation			58.4	60.2	62	KHz
			frequency (run mode)
FPRE		OSC	Half-bridge oscillation	RPRE = 50 kΩ		113.2	116.7	120.2	KHz
			frequency (preheating)
Half bridge section – end-of-life function
IEOLP		EOLP	Current capability			100			µA
VEOLP		EOLP	Reference voltage			1.92	2	2.08	V
		EOL	Operating range	EOLP = 27 kΩ		0.95		4.15	V
				220 kΩ < REOLP < 270
			Window comparator	kΩ or 22 kΩ < REOLP <		tracking with CTR
VS		EOL		27 kΩ					V
			reference
				REOLP > 620KΩ or			2.5
				75 kΩ < REOLP < 91 kΩ

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