Datasheet

LOGIC
Rectified AC
ZCD
GATE
LM3450/50A
GND
COMP
FB
V
AC
CS
2.7V
2.5V
346mV
50 P$
+
-
5 k:
1.5V
Error Amp
Disable
5V
+
-
+
-
Multiplier
+
-
V
OUT
(Non-
isolated)
1/3
OPTO
(Isolated)
R
AC2
R
AC1
R
ZCD
Q
SW
R
CS
C
CMP
R
FB1
R
FB2
L
168mV
Shutdown
+
-
3V
OVP
+
-
I
IN-PK
I
P-PK
I
S-PK
t
i
t
ON
T
SW
LM3450
www.ti.com SNVS681D –NOVEMBER 2010–REVISED MAY 2013
Figure 20. CRM Flyback Current Waveforms
Figure 21. PFC Control Circuit
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