LM3421_09 Datasheet, PDF (5/24 Pages) National Semiconductor (TI) – N-Channel Controllers for Constant Current LED Drivers

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