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L6567 Datasheet(PDF) 10 Page - STMicroelectronics

Part # L6567
Description  HIGH VOLTAGE DRIVER FOR CFL
PDF  15 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6567 Datasheet(HTML) 10 Page - STMicroelectronics

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L6567
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Figure 4. IC Operation
START
VS>VSLOW1
RESTART WITH
F=FMAX
FREQUENCY SHIFTS IN T=TIGN
TOWARDS BURNING STATE CONDITION
(F=MAX{FMAX,FFEEDFORWARD,FCAPACITIVEMODE})
NO OSCILLATION
LOW SIDE MOS ON
HIGH SIDE MOS OFF
VS>VSHIGH1
Y
Y
N
N
START OSCILLATION
F=FMAX
T=T0
N
T=T0+TPRE
Y
VRS>VPH
N
F>FMIN
DECR EASE
FR EQUENCY
OPEN LOAD DETECT ION: STOP
LOW SIDE MOS ON
AND HIGH SIDE MOS OFF
INCREA SE
FR EQUENCY
NY
Y
N
VS>VSHIGH2
VS>VSHIGH2
T>T0+TPRE+TIGN
Y
N
F>FMIN
DECREA SE
FREQUE NCY
INCREASE
FREQUE NCY
Y
NY
N
Y
FEED FORWARD MODE
ACTIVATED
VS>VSHIGH2
VRS<VCMTH
VRS<VCMTH
F>FFEEDFORWARD
F>FMIN
DECREA SE
FREQUE NCY
INCR EASE
FR EQUENCY
Y
N
N
Y
Y
N
Y
N
STOP OSCILLATION
LOW SIDE MOS ON
HIGH SIDE MOS OFF
VS>VSHIGH1
Y
N
Y
PREHEATING MODE
IGNITION MODE
BURNING MODE



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