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LM3450 Datasheet(PDF) 5 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
Part # LM3450
Description  LED Driver with Active Power Factor Correction and Phase Dimming Decoder
PDF  28 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM3450 Datasheet(HTML) 5 Page - National Semiconductor (TI)

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Symbol
Parameter
Conditions
Min
(Note 4)
Typ
(Note 5)
Max
(Note 4)
Units
K
M
Multiplier Gain (Includes Internal
Resistor Divider)
V
AC = 3V, VCMP
= V
THM+1.5V
0.5
1/V
ZERO CURRENT DETECTOR (ZCD)
V
ZCD-RIS
ZCD Input Threshold
V
ZCD Rising
1.45
1.5
1.55
V
Hysteresis
150
200
250
mV
Delay to Output
135
ns
V
ZCD-H
Positive Clamp Voltage
I
ZCD = 1mA
6.0
V
V
ZCD-L
Negative Clamp Voltage
I
ZCD = -50µA
0.61
PWM COMPARATOR (CS)
V
OS
PWM Comparator Input Offset Voltage
30
mV
PWM Comparator Input Bias Current
20
nA
V
LIM
CS Current Limit Threshold
1.40
1.50
1.60
V
CS Delay to Output
100
ns
CS Blanking Sinking Impedance
1
k
Ω
t
LEB
Leading Edge Blanking (LEB) Time
140
ns
ANALOG ADJUST INPUT (V
ADJ)
V
ADJ-LP
V
ADJ Low Threshold (Low Power Mode) VADJ Falling
56
75
mV
V
ADJ Low Hysteresis
50
V
ADJ Pull-up Current Source
1
µA
V
ADJ Open Voltage
V
ADJ Open
3
V
DYNAMIC HOLD CIRCUIT (HOLD, I
SEN)
R
DSON-HD
HOLD MosFET On-Resistance
ISEN Short to
GND
22
30
42
Ω
V
SEN-REF
I
SEN Reference Voltage
162
200
232
mV
I
SEN Bias Current
5
µA
PRE-REGULATOR GATE DRIVE OUTPUT (BIAS)
V
BIAS
BIAS High Voltage @ 100µA
V
CC < VCC-FALL
18.8
21
22.6
V
BIAS Low Voltage @ 100µA
V
CC > VCC-RISE
13.5
14
14.5
GATE DRIVER OUTPUT (GATE)
V
GATE-H
GATE Voltage High
I
GATE = 20mA
11.5
V
I
GATE = 200mA
10.5
GATE Pull Down Resistance
2
8
Ω
GATE Peak Current
(Note 6)
±1.5
A
REFERENCE VOLTAGE OUTPUT (V
REF)
V
REF
Reference Voltage
No Load
2.85
3
3.15
V
Current Limit
1.5
2.0
3.0
mA
DIMMING OUTPUT (DIM, FLT1, FLT2)
FLT1 Output Impedance
Standby Mode
500
k
Ω
Transition
Mode
1.6
Triangle Waveform Compared to FLT2 High
1.49
V
Low
15
mV
f
DIM
DIM Frequency
180
460
700
Hz
OFF-TIMERS
t
OFF-MAX
Maximum Off-Time (Normal Operation)
340
µs
t
OFF-LP
Off-Time (Low Power Mode)
42
5
www.national.com



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