L6567-L6567D Fast Delivery |IC PHOENIX CO.,LIMITED

L6567 ,HIGH VOLTAGE DRIVER FOR CFLBLOCK DIAGRAMVhvRhv Cp/CavRHV CP13 8V 5 1 F VhvS SVSHIGH 2 G1PREHEATING LEVEL FEED FORWARD T1SIDE T ..
L6567D ,HIGH VOLTAGE DRIVER FOR CFLBLOCK DIAGRAMVhvRhv Cp/CavRHV CP13 8V 5 1 F VhvS SVSHIGH 2 G1PREHEATING LEVEL FEED FORWARD T1SIDE T ..
L6567D ,HIGH VOLTAGE DRIVER FOR CFLL6567HIGH VOLTAGE DRIVER FOR CFLn BCD-OFF LINE TECHNOLOGYMULTIPOWER BCD TECHNOLOGYn FLOATING SUPPLY ..
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L6567-L6567D
HIGH VOLTAGE DRIVER FOR CFL
1/15
L6567
January 2000 BCD-OFF LINE TECHNOLOGY FLOATING SUPPLY VOLTAGE UP TO 570V GND REFERRED SUPPLY VOLTAGE UP TO
18V UNDER VOLTAGE LOCK OUT CLAMPING ON Vs DRIVER CURRENT CAPABILITY:
30mA SOURCE
70mA SINK PREHEAT AND FREQUENCY SHIFT TIMING
DESCRIPTION
The deviceisa monolithic high voltage integrated cir-
cuit designedto drive CFL and smallTL lamps witha
minimum part count. providesall the necessary functionsfor proper pre-
heat, ignition and steady state operationof the lamp:
♦ variable frequency oscillator;
♦ settable preheating and ignition time;
♦ capacitive mode protection;
♦ lamp power independent from mains voltage variation.
Besides the control functions, theIC provides the lev- shift and drive functionfor two external power MOS
FETsina half-bridge topology.
SO14 DIP14
ORDERING NUMBERS:
L6567D L6567
HIGH VOLTAGE DRIVER FOR CFL
BLOCK DIAGRAM
FEED FORWARD
VCO+
FREQ. SHIFTING
VOLTAGE
REFERENCE
BIAS
CURRENT
GENERATOR Cf Ci
to
comp.
PREHEATING
TIMING
LOGIC
RHV
Rhv
Vhv
Cp/Cav
LEVEL
SHIFTING
HIGH
SIDE
DRIVER
Cboot
LOW
SIDE
DRIVER
Vhv
Chv
Chv
MAINST2
Rshunt
PGND
RREFRef
D96IN441B
Lamp
SGND
MULTIPOWER BCD TECHNOLOGY
L6567
2/15
PIN FUNCTION
PIN CONNECTION (Top view) Pin Description
1FS Floating Supplyof high side driver G1 Gateof high side switch S1 Sourceof high side switch NC High Voltage Spacer.(Shouldbe not connected)
5VS Supply Voltagefor GND levelcontrol and drive G2 Gateof low side switch PGND Power Ground CP First timing (TPRE TIGN), then averagingthe rippleinthe representationof the HVB (derived
through RHV).
9RS RSHUNT: current monitoring input RREF Reference resistorfor current setting SGND Signal Ground. Internally Connectedto PGND CF Frequency setting capacitor RHV Start-up supply resistor, then supply voltage sensing. CI Timing capacitorfor frequency shift
N.C.S
PGND
RREF
SGND
RHV1
D96IN440
3/15
L6567
ABSOLUTE MAXIMUM RATINGS
NOTES: (1)Donot exceed package thermal dissipation limits
(2)ForVS≤VS high1
(3)ForVS>VS high1
(4) Internally Limited
Note: ESD immunityfor pins1,2 and3is guaranteedupto900V (Human Body Model)
Symbol Parameter Value Unit Low Voltage Supply 18(1) V
VRHV Mains Voltage Sensing VS +2VBE(2)
VCP Preheat/Averaging 5 V
VCF Oscillator Capacitor Voltage 5 V
VCI Frequency Shift Capacitor Voltage 5 V
VRREF Reference Resistor Voltage 5 V
VRS Current Sense Input Voltage -5to5 V
transient 50ns -15 V
VG2 Low Side Switch Gate Output 18 V
VS1 High Side Switch Source Output: normal operation -1to 373 V
0.5sec mains transient -1to 550 V
VG1 High Side Switch Gate Output: normal operation -1to 391 V
0.5sec mains transient -1to 568 V
with respecttopinS1 VbetoVS V
VFS Floating Supply Voltage: normal operation 391 V
0.5sec mains transient 568 V
VFS/S1 Floating Supply vsS1 Voltage 18 V
ΔVFS/ΔT VFS Slew Rate (Repetitive) -4to4 V/ns
ΔVS1/ΔT VS1 Slew Rate (Repetitive) -4to4 V/ns
IRHV Current Into RHV 3(3) mA
IVs Clamped Current intoVS 200(4) mA
Tstg Storage Temperature -40to 150 °C Junction Temperature -40to 150 °C
L6567
4/15
ELECTRICAL CHARACTERISTCS
(VS =12V; RREF =30KΩ;CF= 100pF;Tj =25°C; unless otherwise specified.)
Symbol Parameter Test Condition Min. Typ. Max. Unit- SUPPLYVOLTAGE SECTION high1 VS TurnOn Threshold 10.7 11.7 12.7 V high2 VS Clamping Voltage VS= 20mA 12 13 14 Vlow2 VS TurnOff Threshold 9 10 11 V HYST Supply Voltage Hysteresis 1.5 1.65 1.8 Vlow1 VS Voltageto Guarantee
VG1 =”0”and VG2 =”1 V
ISSP VS Supply Currentat StartUp VS= 10.6V Before turnon 50 250 mA
ISOP VS Supply Operative Current VS= VShigh1 1.2 mA
OSCILLATOR SECTION
foscmin Minimum Oscillator frequency IRHV= 0mA;CI=5V 41.7 43 44.29 kHz
fosc 600m Feed Forward Frequency IRHV= 600mA 47.88 50.4 52.92 kHz
fosc 1mA Feed Forward Frequency IRHV= 1mA 79.8 84 88.2 kHz
fosc max Maximum Oscillator Frequency CI=0V 96.75 107.5 118.25 KHz
ΔICF/ΔVCI Oscillator Transconductance 9 17.5 μA/V
PREHEAT/IGNITION SECTION
P.H.T. Preheat Time Cp= 150nF 0.88 1 1.12 sec
P.H.clocks Numberof Preheat Clocks 16
IGN.clocks Numberof Ignition Clocks 15
RATEOF FREQUENCY CHANGE SECTION
ICIP charge CI Charging Current During
Preheat
106 118 130 mA
ICII charge CI Charging Current During
Ignition 1.2 1.4 mA
ICI disch CI Discharge Current -52 -47 -42 mA
VTHCI CI Low Voltage Threshold 10 100 mV- THRESHOLD SECTION
VCMTH Capacitive Mode Voltage
Threshold
020 40 mV
VPH Preheat Voltage Threshold -0.64 -0.6 -0.56 V- G2 DELAY TIMES SECTION
G1DON On DelayofG1 Output 1.05 1.4 1.75 μs
5/15
L6567
(*) Before startingthefirst commutation; when switching6V isguaranteed.
General operation
The L6567 usesa small amountof current froma supply resistor(s)to start the operationof the IC. Once start conditionis achieved, theIC turnson the lower MOS transistorof the half bridge which allows the bootstrap
capacitorto charge. Once thisis achieved, the oscillator beginsto turnon the upper and lower MOS transistors high frequency, and immediately ramps downtoa preheat frequency. During this stage, theIC preheats the
lamp and aftera predetermined time ramps down again untilit reaches the final operating frequency. TheIC
monitors the currentto determineif the circuitis operatingin capacitive mode.If capacitive switchingis detected,
theIC increases the output frequency until zero-voltage switchingis resumed.
Startup and supplyin normal operation startup the L6567is powered viaa resistor connectedto the RHV pin (pin 13) from the rectified mains. The
current charges the CS capacitor connectedto theVS pin (pin5). When theVS voltage reaches the threshold
VSLOW1 (max 6V), the low side MOS transistoris turnedon while the high side oneis kept off. This condition
assures that the bootstrap capacitoris charged. When VSHIGH1 thresholdis reached the oscillator starts, and
the RHVpin does not provide anymore the supply currentfor theIC (see fig.1).
G2DON On DelayofG2 Output 1.05 1.4 1.75 μs
Ratio between Delay Time+
Conduction TimeofG1 andG2
IRHV= 1mA;Cl=5V=0V
LOW SIDE DRIVER SECTION
Ron G2so G2 Source Output Resistance VS= 12V,V=3V 80 190 Ω
RonG2si G2 Sink Output Resistance VS= 12V,V=3V 65 125 Ω
Ron G1so G1 Source Output Resistance VS= 10V,V=3V 80 190 Ω
RonG1si G1 Sink Output Resistance VS= 10V,V=3V 65 125 Ω
HIGH SIDE DRIVER SECTION
IFSLK Leakage CurrentofFS PINto
GND
VFS= 568V;G1=L
VFS= 568V;G1=H
IS1LK Leakage CurrentofS1 PINto
GND
VS1= 568V;G1=L
VS1= 568V;G1=H
BOOTSTRAP SECTION
BootTh BOOTSTRAP Threshold VS= 10.6V before turnon 5(*) V
AVERAGE RESISTOR
RAVERAGE Average Resistor 27 38.5 50 kΩ
Symbol Parameter Test Condition Min. Typ. Max. Unit DON G1ON+ DON G2ON+-------------------------------------------
ELECTRICAL CHARACTERISTCS (Continued)
L6567
6/15
Figure1. Start up
Oscillator
The circuit starts oscillating when the voltage supply VS has reached the VS HIGH1 threshold.In steady state
condition the oscillator capacitor CF(at pin12)is charged anddischarged symmetrically witha current setmain-by the external resistor RREF connectedto pin 10. The valueof the frequencyis determinedby capacitor CF
and resistor RREF. This fixed valueis called FMIN.A dead time TDT between the ON phasesof the transistors providedfor avoiding cross conduction,so the duty cyclefor eachis less than 50%. The dead time depends RREF value (fig.7).
TheIC oscillating frequencyis between FMIN and FMAX= 2.5· FMINinall conditions.
Preheating mode
The oscillator starts switchingat the maximum frequency FMAX. Then the frequency decreasesat onceto reach
the programmed preheating frequency (fig.2). The rateof decreasing (df/dt)is determinedby the external ca-
pacitorCI (pin 14). The preheat time TPREis adjustable with external components (RREF and CP). The preheat
currentis adjustedby sense resistance RSHUNT. During the preheating time the load currentis sensed with the
sense resistor RSHUNT(connected between pin 9-RS- and pin 7-PGND-).At pin9 the voltage dropon RSHUNT sensedat themoment the low side MOS FETis turned off. Thereisan internal comparator witha fixed thresh-
old VPH:if VRS >VPHthe frequency isdecreased andif VRS oldis reached, the frequencyis held constantfor the programmed preheating time TPRE.
TPREis determinedby the external capacitorCP (pin8) andby the resistor RREF:CPis charged16 times witha
current that dependson RREF, and these16 cycles determine the TPRE. the preheat modeis programmable with external componentsasfaras TPREis concerned (RREF &CP) andfaras the preheating currentis concerned (choosing properly RSHUNTand the resonant load components:
Land CL).
The circuitis heldin the preheating mode when pin8 (CP)is grounded. case FMINis reached during preheat, theIC assumesan open load. Consequently the oscillation stops with
the low side MOS transistor gateon andthe high side gate off. This conditionis kept untilVS undershoots VSLOW1.
VSLOW1
VSHIGH1
low side mosfet
VG-VS
high side mosfet TDT
TIME
7/15
L6567
Figure2. Preheating and ignition state.
Ignition mode the endof the preheat phase the frequency decresesto the minimumfrequency (FMIN), causing an increased
coil current anda high voltage appearing across the lamp. Thatis because the circuit works near resonance.
This high voltage normally ignites the lamp. Thereisno protectionto avoid high ignition currents through the
MOS transistors when the lamp doesn’t ignite. This only occursinan endof lamplife situationin which the circuit
may break. Now the lowest frequencyis the resonance frequencyofL andCL (the capacitor across the lamp).
The ignition phase finishes when the frequency reaches FMINor (at maximum) when the ignition time has
elapsed. The ignition timeis relatedto TPRE:TIGN= (15/16)· TPRE. TheCP capacitoris charged15 times with
the same current usedto chargeit during TPRE.
The frequency shifting slopeis determinedbyCI.
During the ignition time the VRSmonitoring function changesin the capacitive mode protection.
Steady state operation: feed forwardfrequency
The lamp starts operatingat FMIN, determinedby RREF and CF directly after the ignition phase.To prevent too
high lamp powerat high mains voltages,a feed forward correctionis implemented.At the endof the preheat
phase the RHVpinis connectedtoan internal resistorto sense the High Voltage Bus.If the currentin this resistor
increases and overcomesa value setby RREF, the current that charges the oscillator capacitorCF increases
too. The effectisan increasein frequency limiting the powerin the lamp.In orderto prevent feed forwardof the
rippleof the VHVvoltage, the rippleis filtered with capacitor CPon pin8 andan integrated resistor RAVERAGE.
Figure3. Burn state
TIME
FREQUENCY
FMAX
FMIN
preheating
state
ignition
state burning state
FMIN
feed forward mode
FREQUENCY
Irhv
L6567
8/15
Capacitive mode protection
During ignition and steady state the operating frequencyis higher than the resonance frequencyof the load
(L,CL,RLAMP and RFILAMENT),so the transistors are turnedon during the conduction timeof the body diodein
orderto maintain Zero Voltage Switching. the operating frequency undershoots the resonance frequency ZVS doesn’t occur and causes hard switching the MOS transistors. The L6567 detects this situationby measuring VRS when the low side MOS FETis turned
on.At pin9 thereisan internal comparator with thresholdV CMTH (typ~20mV):if VRS assumed and the frequencyis increasedas longas this situationis present. The shiftis determinedby CI.
Steady state frequency any time during steady state the frequencyis determinedby the maximumon the following three frequencies:
fSTEADY STATE=MAX {FMIN,fFEEDFORWARD ,fCAPACITIVEMODEPROTECTION}. supply startup theICis supplied witha current that flows through RHV andan internal diodeto theVS pin which-
charges the external capacitor CS.In steady state condition RHVis usedasa mains voltage sensor,soit doesn’t
provide anymore the supply current. The easiest wayto charge theCS capacitor (and tosupply the IC)isto use charge pump from the middle pointof the half bridge. guaranteea minimum gate power MOS drive, theIC stops oscillating whenVSis lower than VSHIGH2.It will
restart once theVS will become higher than VSHIGH1.A minimum voltage hysteresisis guaranteed. TheICre-
starts operatingatf= FMAX,then the frequency shifts towards FMIN. The timingof this frequency shiftingis TIGN
(thatis: CP capacitoris charged and discharged15 times).Now the oscillator frequencyis controlledasin stan-
dard burning condition (feed forward and capacitive mode control). Excess chargeonCSis drainedbyan inter-
nal clamp that turnsonat voltage VSCL.
Ground pins
Pin 7(PGND)is the ground referenceof theIC with respectto the application. Pin 11( SGND) providesa local
signal ground referencefor the components connectedto the pins CP,CI,RREF and CF.
Relationship between external components and sistem working condition
L6567is designedto drive CFL andTL lamps witha minimum part count topology. This feature implies that each
external componentis relatedto oneor more circuit operating state.
This tableisa short summaryof these relationships:
FMIN ---> RREF &CF
FFEED FORWARD --->CF &IRHV
TPRE &TIGN --->CP &RREF
FPRE ---> RSHUNT,L,CL, LAMP
TDT ---> RREF
df/dt --->CI
Some useful formulas can well approximate the values: IRHVis greater than: ,the feed forward frequencyis settledand the frequency valueis fittedby the
following expression: MIN 1 REFCF⋅⋅---------------------------------≅ RHV 15 REF
--------------≥ FEEDFORWARD
IRHV
121 CF⋅---------------------≅

Partno	Mfg	Dc	Qty	Available	Descript
L6567	STM	N/a	655	avai	HIGH VOLTAGE DRIVER FOR CFL
L6567D		N/a	307	avai	HIGH VOLTAGE DRIVER FOR CFL
L6567D	ST	N/a	34	avai	HIGH VOLTAGE DRIVER FOR CFL