L6567 STMicroelectronics, L6567 Datasheet - Page 10

• Manufacturer Part Number: L6567
• Description: HIGH VOLTAGE DRIVER FOR CFL
• Manufacturer: STMicroelectronics

L6567
Figure 4. IC Operation
10/15
RESTART WITH
F=F
FREQUENCYSHIFTS IN T=T
TOWARDS BURNING STATE CONDITION
(F=MAX{F
PREHEATING MODE
MAX
MAX
,F
OPEN LOAD DETECT ION: STOP
LOW SIDE MOS ON
AND HIGH SIDE MOS OFF
V
S
FEEDFORWARD
>V
SHIGH1
N
Y
DECR EASE
FREQUENCY
,F
CAPACITIVEMODE
F>F
IGN
MIN
Y
N
N
N
STOP OSCILLATION
LOW SIDE MOS ON
HIGH SIDE MOS OFF
START OSCILLATION
F=F
T=T
NO OSCILLATION
LOW SIDE MOS ON
HIGH SIDE MOS OFF
})
MAX
0
V
T=T
START
V
V
S
V
S
S
>V
Y
N
>V
>V
RS
0
+T
>V
SHIGH2
SLOW1
SHIGH1
Y
Y
PRE
PH
INCREA SE
FREQUENCY
N
Y
N
Y
BURNING MODE
N
DECREA SE
FREQUE NCY
F>F
Y
MIN
N
FEED FORWARD MODE
ACTIVATED
Y
IGNITION MODE
F>F
V
V
S
>V
RS
N
FEEDFORWARD
<V
SHIGH2
Y
CMTH
V
S
N
DECREA SE
FREQUE NCY
>V
INCR EASE
FREQUENCY
F>F
Y
SHIGH2
N
Y
MIN
N
Y
T>T
Y
V
RS
0
+T
<V
PRE
CMTH
N
INCREASE
FREQUE NCY
+T
IGN
Y