L6567D Просмотр технического описания (PDF) - STMicroelectronics

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L6567D

HIGH VOLTAGE DRIVER FOR CFL

STMicroelectronics 

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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