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LM3445 Datasheet(PDF) 5 Page - Texas Instruments

No. de pieza LM3445
Descripción Electrónicos  TRIAC Dimmable Offline LED Driver
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Fabricante Electrónico  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
Logo TI1 - Texas Instruments

LM3445 Datasheet(HTML) 5 Page - Texas Instruments

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LM3445
www.ti.com
SNVS570M – JANUARY 2009 – REVISED NOVEMBER 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 = +25ºC, and are provided for reference purposes only.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
BLEEDER
RBLDR
Bleeder resistance to GND
IBLDR = 10 mA
230
325
VCC SUPPLY
IVCC
Operating supply current
2
2.85
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
Current limit reset delay
180
µs
tISNS
ISNS = 0 to 1.75-V
ISNS limit to GATE delay
33
ns
step
INTERNAL PWM RAMP
fRAMP
Frequency
5.85
kHz
Valley voltage
0.96
1
1.04
VRAMP
V
Peak voltage
2.85
3
3.08
DRAMP
Maximum duty cycle
96.5%
98%
DIM DECODER
tANG_DET
Angle detect rising threshold
Observed on BLDR pin
6.79
7.21
7.81
V
ASNS filter delay
4
µs
VASNS
ASNS VMAX
3.85
4
4.15
V
ASNS drive capability sink
VASNS = 2 V
7.6
ASNS drive capability source
VASNS = 2 V
–4.3
IASNS
mA
DIM low sink current
VDIM = 1 V
1.65
2.8
DIM High source current
VDIM = 4 V
–4
–3
PWM input voltage
DIM low voltage
0.9
1.33
threshold
VDIM
V
DIM high voltage
2.33
3.15
VTSTH
Tri-state threshold voltage
Apply to FLTR1 pin
4.87
5.25
V
RDIM
DIM comparator tri-state impedance
10
M
CURRENT SENSE COMPARATOR
VFLTR2
FLTR2 open circuit voltage
720
750
780
mV
RFLTR2
FLTR2 impedance
420
k
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
Copyright © 2009–2015, Texas Instruments Incorporated
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