Datasheet
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
Rising 12.2 13.0 13.6
V
V
CC-FALL
Controller Disable Threshold V
CC
falling 7.4 7.9 8.5
Glitch Filter Delay 9
µs
Turn-on Delay 40
I
Q
V
CC
Quiescent Current No Switching 1.6 mA
I
Q-SD
V
CC
Shutdown Current V
FB
= 0V 515 625 µA
ERROR AMPLIFIER & COMPENSATION (FB, COMP)
V
FB
FB Reference (Normal Operation) 2.43 2.50 2.57 V
Input Bias Current V
FB
= 2.5V 100 nA
G
M
Transconductance V
FB
=2.5V 69 115 161 µS
Output Source / Sink Capability 60 85 110
µA
FB Pull-up Current Source V
FB
< 1.8V 43 51 59
COMP Pull-up Resistor 5 kΩ
V
CMP-B
COMP Low Threshold (Burst) V
CMP
Falling V
THM
-0.08 V
COMP Low Hysteresis 20
V
FB-SD
Low Threshold (Shutdown) V
FB
Falling 150 168 186
FB Low Hysteresis 20 mV
V
FB-EAD
FB Mid Threshold (EA Disabled) V
FB
Falling 328 346 368
FB Mid Hysteresis 20
V
FB-OV
FB High Threshold (Over-voltage) 1.20 x V
FB
1.22 x V
FB
V
COMP Pre-bias Source Current V
CMP
= 0.5V 415 µA
V
THM
Minimum COMP Voltage (Normal) 1.47 V
ANGLE DEMODULATION & MULTIPLIER (COMP, V
AC
)
V
AC-DET
V
AC
Angle Detection Threshold 334 356 378 mV
Angle Demodulation Delay Time Both edges 8 µs
VAC Dynamic Input Voltage Range 0 to 5.5
V
COMP Dynamic Input Voltage Range V
THM
to
V
THM
+2
V
AC
Input Impedance 500 kΩ
K
M
Multiplier Gain (Includes Internal V
AC
= 3V, V
CMP
=
0.5 1/V
Resistor Divider) V
THM
+1.5V
ZERO CURRENT DETECTOR (ZCD)
V
ZCD-RIS
ZCD Input Threshold V
ZCO
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
ZCO
= 1mA 6.0
V
V
ZCD-L
Negative Clamp Voltage I
ZCO
= –50µA 0.61
PWM COMPARATOR (CS)
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.
4 Submit Documentation Feedback Copyright © 2010–2013, Texas Instruments Incorporated
Product Folder Links: LM3450