Datasheet

+
-
+
-
+
-
ANGLE
DEMOD
DIM
R
2R
COMP
FB
2.7V
2.5V
346mV
50 PA
1 PA
168mV
3V
75 mV
FLT1
FLT2
500 k:
+
-
Low Power
V
CCUV
CS
GND
ZCD
HOLD
GATE
+
-
5 PA
5 k:
40 k:
+
-
LEB
1.5V
LOGIC
&
CONTROL
Over Voltage
Shutdown
Error Amp
Disable
5V
+
-
PWM
Current Limit
Multiplier
1.5V
Zero Crossing
6V
BIAS
V
CCUV
6V
14V
INTERNAL
REGULATORS
V
CC
UVLO
+
-
3V
Q
Q
R
S
THERMAL
SHUTDOWN
10V
LEB
V
CCUV
Sampled Hold
Transition
140 ns
Low Power
MAXIMUM
OFF-TIME
(340 Ps, 42 Ps)
1 k:
V
CCUV
COMP
PRE-BIAS
Amplitude Adjust
Low Power
Reset Off-Timer
Timer Expired
+
-
+
-
+
-
+
-
+
-
Burst
1.4V
Burst
1.5V
SAMPLE and
LOG REMAP
D
IN
D
OUT
500 Hz Triangle
D
IN
D
OUT
V
CC
I
SEN
V
REF
V
AC
V
ADJ
LM3450A has
Continuous Hold
*LM3450 and LM3450A are identical except where indicated in blue
LM3450
www.ti.com SNVS681D –NOVEMBER 2010–REVISED MAY 2013
BLOCK DIAGRAM
Copyright © 2010–2013, Texas Instruments Incorporated Submit Documentation Feedback 9
Product Folder Links: LM3450