NCL30185 Datasheet, PDF (4/28 Pages) ON Semiconductor – Power Factor Corrected Quasi-Resonant Primary Side Current-Mode Controller

NCL30185
Internal Circuit Architecture
Over Voltage Protection
(Auto−recovery or Latched)
Over Temp. Protection
(Auto−recovery or Latched)
SD
Thermal
Foldback
V _TF
Aux_SCP
Internal
Thermal
Shutdown
Enable
Fault
Management
STOP
OFF
UVLO
Latch
V_DD
V_REF
VCC Management
VCC_max
WOD_SCP
BO_NOK
VCC Over Voltage
Protection
DRV
FF_mode
V_VS
V _REF
FF_mode
ZCD
Zero Crossing Detection Logic
(ZCD Blanking, Time−Out, ...)
Valley Selection
Frequency Foldback
Aux. Winding Short Circuit Prot.
V _VS
Aux_SCP
V_REFX
CS_ok
S
Q
Q
VCC
Clamp
Circuit
Line
R
feed−forward
STOP
V_VS
V_REFX
CS
Leading
Edge
Blanking
Power Factor and
Constant−Current
Control
CS_reset
Maximum
on time
Max. Peak
Current
Limit
Ipkmax
CS Short
Protection
CS_ok
Ipkmax STOP
t _on,max
BO_NOK
V_VS
STEP_DIM
Brown−Out
UVLO
t _on,max
V_REFX
Dimming
control
V_REF
Winding and
Output diode
Short Circuit
WOD_SCP
V_TF
Protection
Figure 3. Internal Circuit Architecture
VCC
DRV
COMP
VS
GND
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