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LM3444 Folha de dados(PDF) 5 Page - Texas Instruments

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Nome de Peças LM3444
Descrição Electrónicos  AC-DC Offline LED Driver
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Fabricante Electrônico  TI1 [Texas Instruments]
Página de início  http://www.ti.com
Logo TI1 - Texas Instruments

LM3444 Folha de dados(HTML) 5 Page - Texas Instruments

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LM3444
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SNVS682D – NOVEMBER 2010 – REVISED DECEMBER 2015
6.5 Electrical Characteristics
All typical limits are for TJ = 25°C and all maximum and minimum limits apply over the full operating temperature range
(TJ = −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 TJ = 25°C, and are provided for reference purposes only. Unless
otherwise stated the following conditions apply: VCC = 12 V.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
VCC SUPPLY
IVCC
Operating supply current
1.58
2.25
mA
Rising threshold
7.4
7.7
VCC-UVLO
Falling threshold
6
6.4
V
Hysterisis
1
COFF
VCOFF
Time-out threshold
1.225
1.276
1.327
V
RCOFF
Off timer sinking impedance
33
60
tCOFF
Restart timer
180
µs
CURRENT LIMIT
VISNS
ISNS limit threshold
1.174
1.269
1.364
V
Leading edge blanking time
125
ns
tISNS
Current limit reset delay
180
µs
ISNS limit to GATE delay
ISNS = 0 to 1.75-V step
33
ns
CURRENT SENSE COMPARATOR
VFILTER
FILTER open circuit voltage
720
750
780
mV
RFILTER
FILTER impedance
1.12
M
VOS
Current sense comparator offset voltage
–4
0.1
4
mV
GATE DRIVE OUTPUT
VDRVH
GATE high saturation
IGATE = 50 mA
0.24
0.5
V
VDRVL
GATE low saturation
IGATE = 100 mA
0.22
0.5
Peak souce current
GATE = VCC/2
–0.77
IDRV
A
Peak sink current
GATE = VCC/2
0.88
Rise time
Cload = 1 nF
15
tDV
ns
Fall time
Cload = 1 nF
15
THERMAL SHUTDOWN
Thermal shutdown temperature
165
TSD
See (1)
°C
Thermal shutdown hysteresis
20
(1)
Junction-to-ambient thermal resistance is highly application and board-layout dependent. In applications where high maximum power
dissipation exists, special care must be paid to thermal dissipation issues in board design. In applications where high power dissipation
and/or poor package thermal resistance is present, the maximum ambient temperature may have to be derated. Maximum ambient
temperature (TA-MAX) is dependent on the maximum operating junction temperature (TJ-MAX-OP = 125°C), the maximum power dissipation
of the device in the application (PD-MAX), and the junction-to ambient thermal resistance of the part/package in the application (RθJA), as
given by the following equation: TA-MAX = TJ-MAX-OP – (RθJA × PD-MAX).
Copyright © 2010–2015, Texas Instruments Incorporated
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