LM3450 Datasheet, PDF (4/40 Pages) National Semiconductor (TI) – LED Driver with Active Power Factor Correction and Phase Dimming Decoder

LM3450
SNVS681D – NOVEMBER 2010 – REVISED MAY 2013
www.ti.com
ELECTRICAL CHARACTERISTICS⁽¹⁾
Unless otherwise specified V_CC = 14V. Specifications in standard type face are for T_J = 25°C and those with boldface type
apply over the full Operating Temperature Range ( T_J = −40°C to +125°C). Typical values represent the most likely
parametric norm at T_A = T_J = +25°C, and are provided for reference purposes only.
Symbol
Parameter
Conditions
Min ⁽²⁾
Typ ⁽³⁾
Max ⁽²⁾
Units
SUPPLY VOLTAGE INPUT (V_CC)
V_CC-RISE
Controller Enable Threshold
V_CC-FALL
Controller Disable Threshold
Glitch Filter Delay
Turn-on Delay
V_CC Rising
V_CC falling
12.2
13.0
13.6
V
7.4
7.9
8.5
9
µs
40
I_Q
V_CC Quiescent Current
No Switching
I_Q-SD
V_CC Shutdown Current
V_FB = 0V
ERROR AMPLIFIER & COMPENSATION (FB, COMP)
1.6
mA
515
625
µA
V_FB
FB Reference (Normal Operation)
Input Bias Current
V_FB = 2.5V
G_M
Transconductance
V_FB =2.5V
Output Source / Sink Capability
FB Pull-up Current Source
COMP Pull-up Resistor
V_FB < 1.8V
2.43
2.50
2.57
V
100
nA
69
115
161
µS
60
85
110
µA
43
51
59
5
kΩ
V_CMP-B
COMP Low Threshold (Burst)
COMP Low Hysteresis
V_CMP Falling
V_THM -0.08
V
20
V_FB-SD
Low Threshold (Shutdown)
FB Low Hysteresis
V_FB Falling
150
168
186
20
mV
V_FB-EAD
FB Mid Threshold (EA Disabled)
FB Mid Hysteresis
V_FB Falling
328
346
368
20
V_FB-OV
FB High Threshold (Over-voltage)
COMP Pre-bias Source Current
V_CMP= 0.5V
V_THM
Minimum COMP Voltage (Normal)
ANGLE DEMODULATION & MULTIPLIER (COMP, V_AC)
V_AC-DET
V_AC Angle Detection Threshold
Angle Demodulation Delay Time
Both edges
1.20 x V_FB 1.22 x V_FB
V
415
µA
1.47
V
334
356
378
mV
8
µs
VAC Dynamic Input Voltage Range
0 to 5.5
COMP Dynamic Input Voltage Range
V_THM to
V
V_THM+2
V_AC Input Impedance
500
kΩ
K_M
Multiplier Gain (Includes Internal
V_AC = 3V, V_CMP =
Resistor Divider)
V_THM+1.5V
0.5
1/V
ZERO CURRENT DETECTOR (ZCD)
V_ZCD-RIS
ZCD Input Threshold
Hysteresis
V_ZCORising
1.45
1.5
1.55
V
150
200
250
mV
Delay to Output
135
ns
V_ZCD-H
Positive Clamp Voltage
V_ZCD-L
Negative Clamp Voltage
PWM COMPARATOR (CS)
I_ZCO = 1mA
I_ZCO = –50µA
6.0
V
0.61
V_OS
PWM Comparator Input Offset Voltage
30
mV
(1) Absolute Maximum Ratings indicate limits beyond which damage to the component may occur. Operating Ratings are conditions under
which operation of the device is specified and do not imply ensured performance limits. For specified performance limits and associated
test conditions, see the Electrical Characteristics table. All voltages are with respect to the potential at the GND pin, unless otherwise
specified.
(2) All limits specified at room temperature (standard typeface) and at temperature extremes (bold typeface). All room temperature limits are
100% production tested. All limits at temperature extremes are specified via correlation using standard Statistical Quality Control (SQC)
methods. All limits are used to calculate Average Outgoing Quality Level (AOQL).
(3) Typical numbers are at 25°C and represent the most likely norm.
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