Datasheet
LM3448
SNOSB51C –SEPTEMBER 2011–REVISED MAY 2013
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ELECTRICAL CHARACTERISTICS
(1)
V
CC
= 12V unless otherwise noted. Limits 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). Minimum and Maximum limits are specified through test,
design, or statistical correlation. Typical values represent the most likely parametric norm at T
J
= +25ºC and are provided for
reference purposes only.
Symbol Parameter Conditions Min
(2)
Typ
(3)
Max
(2)
Units
BLEEDER
R
BLDR
Bleeder resistance to GND I
BLDR
= 10mA 230 325 Ω
V
CC
SUPPLY
I
VCC
Operating supply current Non-switching 2.00 2.85 mA
V
CC-UVLO
Rising threshold 7.4 7.7 V
Falling threshold 6.0 6.4
Hysterisis 1
COFF
V
COFF
Time out threshold 1.225 1.276 1.327 V
R
COFF
Off timer sinking impedance 33 60 Ω
t
COFF
Restart timer 180 µs
CURRENT LIMIT
V
ISNS
ISNS limit threshold 1.174 1.269 1.364 V
t
ISNS
Leading edge blanking time 125 ns
Current limit reset delay 180 µs
INTERNAL PWM RAMP
f
RAMP
Frequency 5.85 kHz
V
RAMP
Valley voltage 0.96 1.00 1.04 V
Peak voltage 2.85 3.00 3.08
D
RAMP
Maximum duty cycle 96.5 98.0 %
DIM DECODER
V
ANG_DET
Angle detect rising threshold Observed on BLDR pin 6.79 7.21 7.81 V
V
ASNS
ASNS filter delay 4 µs
ASNS VMAX 3.81 3.96 4.11 V
I
ASNS
ASNS drive capability sink V
ASNS
= 2V -7.6 mA
ASNS drive capability source V
ASNS
= 2V 4.3
I
DIM
DIM low sink current V
DIM
= 1V -2.80 -1.65
DIM high source current V
DIM
= 4V 3.00 4.00
V
DIM
DIM low voltage PWM input voltage threshold 0.9 1.33 V
DIM high voltage 2.33 3.15
V
TSTH
TRI-STATE threshold voltage Apply to FLTR1 pin 4.87 5.25 V
R
DIM
DIM comparator TRI-STATE impedance 10 MΩ
CURRENT SENSE COMPARATOR
V
FLTR2
FLTR2 open circuit voltage 720 750 780 mV
R
FLTR2
FLTR2 impedance 420 kΩ
OUTPUT MOSFET (SW FET)
V
BVDS
SW to ISNS breakdown voltage 600 660 V
(1) Absolute Maximum Ratings are 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 ensured 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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