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LM3421 датащи(PDF) 5 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
номер детали LM3421
подробное описание детали  N-Channel Controllers for Constant Current LED Drivers
PDF  24 Pages
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производитель  NSC [National Semiconductor (TI)]
домашняя страница  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM3421 датащи(HTML) 5 Page - National Semiconductor (TI)

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background image
Symbol
Parameter
Conditions
Min (Note 7) Typ (Note 8)
Max (Note 7)
Units
R
DPOL
DPOL Pullup Resistance
500
1200
K
Ω
FAULT TIMER
V
FLTTH
Fault Threshold
1.185
1.240
1.285
V
I
FLT
Fault Pin Source Current
10
11.5
13
µA
ERROR AMPLIFIER
V
REF
CSH Reference Voltage
With Respect to AGND
1.210
1.235
1.260
V
Error Amplifier Input Bias
Current
-0.6
0
0.6
µA
COMP Sink / Source Current
22
30
35
Transconductance
100
µA/V
Linear Input Range
(Note 9)
±125
mV
Transconductance Bandwidth
(Note 9)
-6dB Unloaded Response
0.5
1.0
MHz
OFF TIMER
Minimum Off-time
RCT = 1V through 1k
Ω
35
75
ns
R
RCT
RCT Reset Pull-down
Resistance
36
120
Ω
V
RCT
V
IN/25 Reference Voltage
V
IN = 14V
540
565
585
mV
f
Continuous Conduction
Switching Frequency
2.2nF > C
T > 470pF
25/(C
TRT)
Hz
PWM COMPARATOR
COMP to PWM Offset
700
800
900
mV
CURRENT LIMIT (IS)
I
LIM
Current Limit Threshold
215
245
275
mV
I
LIM Delay to Output
35
75
ns
Leading Edge Blanking Time
115
210
325
HIGH SIDE TRANSCONDUCTANCE AMPLIFIER
Input Bias Current
11.5
µA
Transconductance
20
119
mA/V
Input Offset Current
-1.5
0
1.5
µA
Input Offset Voltage
-7
0
7
mV
Transconductance Bandwidth
(Note 9)
I
CSH = 100µA
250
500
kHz
GATE DRIVER (GATE)
R
SRC(GATE)
GATE Sourcing Resistance
GATE = High
2.0
6.0
Ω
R
SNK(GATE)
GATE Sinking Resistance
GATE = Low
1.3
4.5
DIM DRIVER (DIM, DDRV)
nDIM
VTH
nDIM / UVLO Threshold
1.185
1.240
1.285
V
nDIM
HYS
nDIM Hysteresis Current
20
23
25
µA
R
SRC(DDRV)
DDRV Sourcing Resistance
DDRV = High
13.5
30.0
Ω
R
SNK(DDRV)
DDRV Sinking Resistance
DDRV = Low
3.5
10.0
PULL-DOWN N-CHANNEL MOSFETS
R
RPD
RPD Pull-down Resistance
145
300
Ω
R
FLT
FLT Pull-down Resistance
145
300
R
LRDY
LRDY Pull-down Resistance
135
300
THERMAL SHUTDOWN
T
SD
Thermal Shutdown Threshold
165
°C
T
HYS
Thermal Shutdown Hysteresis
25
THERMAL RESISTANCE
5
www.national.com



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