L6567 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'L6567' PDF : 15 Pages View PDF
L6567
Figure 4. IC Operation
START
PREHEATING MODE
VS>VSLOW1
N
Y
NO OSCILLATION
LOW SIDE MOS ON
HIGH SIDE MOS OFF
N
VS>VSHIGH1
Y
START OSCILLATION
F=FMAX
T=T0
N
VS>VSHIGH2
Y
T=T0+TPRE
Y
N
N
Y
VRS>VPH
N
F>FMIN
Y
DECR EASE
FR EQUENCY
INCREA SE
FR EQUENCY
VS>VSHIGH2
Y
N
T>T0+TPRE+TIGN
Y
N
IGNITION MODE
VRS<VCMTH
N
Y
F>FMIN
Y
DECREA SE
FREQUE NCY
INCREASE
FREQUE NCY
OPEN LOAD DETECT ION: STOP
LOW SIDE MOS ON
AND HIGH SIDE MOS OFF
STOP OSCILLATION
LOW SIDE MOS ON
HIGH SIDE MOS OFF
VS>VSHIGH1
N
Y
RESTART WITH
F=FMAX
FREQUENCY SHIFTS IN T=TIGN
TOWARDS BURNING STATE CONDITION
(F=MAX{FMAX,FFEEDFORWARD,FCAPACITIVE MODE })
FEED FORWARD MODE
ACTIVATED
N
BURNING MODE
Y
VS>VSHIGH2
Y
Y
VRS<V CMTH
N
N
F>F FEEDFORWARD
N
F>FMIN
Y
DECREA SE
FREQUE NCY
INCR EASE
FR EQUENCY
10/15
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