NCL30001 Datasheet, PDF (2/31 Pages) ON Semiconductor – High-Efficiency Single Stage Power Factor Correction and Step-Down Offline LED Driver

CT
Ramp
Comp
AC IN
FB
V_FF
CM
AC COMP
NCL30001
Jitter
Jitter
Adj.
Oscillator
DC Max
Sawtooth
FB
+
Clock
DC Max
Ramp. Comp.
Adj.
Ramp Comp
V_DD
AC In skip
comparator
+
+
−
V_SSKIP(sync)
RFB
FB skip
Comparator
+
+
−
Soft−skip Ramp
Delay
t_SSKIP
Start
Terminate
FB overload Overload
comparator Timer
+
t_OVLD
−
Enable
S
Q
V_OVLD
R
OVLD
VFFBrown−Out
Comparator
V_FF
−
+
+
V_BO
BO
Enable
Out x 2
Resectounter
Dual HV
start−up
current source
Reset
VCCOK
V_CC(off) HV current
Reset V_CC
Management
Start
V_DD
V_DD
Clock
DC Max
V_SSKIP
Transient Load Detect
+ ^Comparator
−
+
Ramp Comp
V_SSKIP(TLD)
FB
V−to−I
21.33kW
V−to−I
+
−
PWM Skip
Comparator
S
Q
R ^Output
Driver
Reference
Generator
V_FF
+
− ^gm
AC error
Amplifier
V−to−I
+ inverter
21.33kW
+
−
PWM
comparator
+
4V
OVLD
BO
Latch
V_CCOK
Blanking
t_LEB
gm
Current sense
amplifier
Startup
GND
DRV
V_CC
I_spos
V_DD
I_latch(clamp)
Latch−Off
I_latch(shdn)
V_latch(clamp)
OVP Comparator
+
+
−
V_latch(high)
OTP Comparator
−
+
+
V_latch(low)
blanking
t_Latch(delay)
S
Q
R
Latch
Reset
Figure 1. Detailed Block Diagram
I_avg
TEST
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