LM3424 Datasheet, PDF (7/69 Pages) National Semiconductor (TI) – Constant Current N-Channel Controller with Thermal Foldback for Driving LEDs

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LM3424, LM3424-Q1
SNVS603C – AUGUST 2009 – REVISED AUGUST 2015
Electrical Characteristics (continued)
MIN and MAX limits apply over the full Operating Temperature Range (T_A = T_J = −40°C to 125°C) unless otherwise specified.
Minimum and Maximum limits are ensured through test, design, or statistical correlation. Unless otherwise stated the following
condition applies: T_J = 25°C, V_IN = 14 V.
PARAMETER
TEST CONDITIONS
MIN ⁽¹⁾ TYP ⁽²⁾
MAX ⁽¹⁾
UNIT
Transconductance Bandwidth
I_CSH = 100 µA⁽³⁾
500
kHz
GATE DRIVER (GATE)
R_SRC-GATE
GATE Sourcing Resistance
R_SNK-GATE
GATE Sinking Resistance
UNDERVOLTAGE LOCKOUT and DIM INPUT (nDIM)
GATE = High
GATE = Low
2
6
Ω
1.3
4.5
Ω
V_TH-nDIM
nDIM / UVLO Threshold
I_HYS-nDIM
nDIM Hysteresis Current
DIM DRIVER (DDRV)
1.185 1.240
1.285
V
13
20
27
µA
R_SRC-DDRV
R_SNK-DDRV
DDRV Sourcing Resistance
DDRV Sinking Resistance
nDIM rising to DDRV rising
DDRV = High
DDRV = Low
13.5
30
Ω
3.5
10
Ω
700
ns
nDIM falling to DDRV falling
360
ns
SOFT-START (SS)
I_SS
Soft-start current
THERMAL CONTROL
10
µA
V_S
V_S Voltage
I_VS = 0A
I_VS = 1 mA
TREF input bias current
V_TREF = 1.5 V
V_TSENSE = 1.5 V
TSENSE Input Bias Current
V_TREF = 1.5 V
V_TSENSE = 1.5 V
I_TGAIN-MAX
TGAIN Maximum Sourcing Current V_TGAIN = 2 V
I_TF
CSH Current with High-side
R_TGAIN = 10 V_TREF = 1.5 V
Amplifier Disabled
kΩ
V_TSENSE = 0.5 V
V_TREF = 1.5 V
V_TSENSE = 1.4 V
V_TREF = 1.5 V
V_TSENSE = 1.5 V
THERMAL SHUTDOWN
T_SD
T_HYS
Thermal Shutdown Threshold
Thermal Shutdown Hysteresis
See ⁽³⁾
See ⁽³⁾
2.4 2.45
0.1
0.1
200
600
100
10
2
165
25
2.5
V
µA
µA
µA
µA
µA
µA
°C
°C
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