LM3450 Datasheet, PDF (9/40 Pages) National Semiconductor (TI) – LED Driver with Active Power Factor Correction and Phase Dimming Decoder

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FLT2
FLT1
V_ADJ
V_AC
COMP
FB
BIAS
LM3450
BLOCK DIAGRAM
SNVS681D – NOVEMBER 2010 – REVISED MAY 2013
*LM3450 and LM3450A are identical except where indicated in blue
V_CCUV
DIM
1 PA
+
75 mV -
+
-
V_CCUV
Low Power
Amplitude Adjust
+
-
500 Hz Triangle
3V +
-
V_REF
HOLD
SAMPLE and
LOG REMAP
ANGLE
DEMOD
DIN
DOUT
DIN
2R
DOUT
500 k:
Transition
Sampled Hold
Multiplier
LM3450A has
Continuous Hold
5 PA
40 k:
+
-
I_SEN
GND
R
+
1.4V -
Burst
50 PA
5V
COMP
PRE-BIAS
PWM
Current Limit
LEB
+
- 1.5V
1 k:
2.7V
-
2.5V +
346mV +
-
168mV +
-
5 k:
Error Amp
Disable
Shutdown
LOGIC
&
CONTROL
Zero Crossing
Burst
1.5V
+ 1.5V
-
6V
THERMAL
INTERNAL
SHUTDOWN REGULATORS
+
3V ^-
Over Voltage
V_CC UVLO
V_CCUV
10V
Low Power
14V
RQ
6V
V_CCUV
SQ
Low Power
MAXIMUM
OFF-TIME
Timer Expired
Reset Off-Timer
(340 Ps, 42 Ps)
LEB _{140 ns}
CS
ZCD
V_CC
GATE
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