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

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
номер детали LM3450
подробное описание детали  LED Driver with Active Power Factor Correction and Phase Dimming Decoder
PDF  28 Pages
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производитель  NSC [National Semiconductor (TI)]
домашняя страница  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM3450 датащи(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
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