LM3464 Datasheet, PDF (5/33 Pages) National Semiconductor (TI) – 4 Channel LED Driver Evaluation Board

LM3464, LM3464A
www.ti.com
SNVS652F – APRIL 2010 – REVISED MAY 2013
Electrical Characteristics (LM3464/LM3464A) (continued)
Specification with standard type are for T_A = T_J = +25°C only; limits in boldface type apply over the full Operating Junction
Temperature (T_J) range. Minimum and Maximum are specified through test, design or statistical correlation. Typical values
represent the most likely parametric norm at T_J = +25°C, and are provided for reference purposes only. Unless otherwise
stated the following conditions apply: V_IN = 48V.
Symbol
Parameter
Conditions
Min Typ Max Units
I_EN-MAX
EN pin internal pull current
Analog Dimming Control Interface
V_EN = 0V
7.2
11 14.7 uA
V_CTHM-MAX
Sawtooth max. voltage threshold at
Thermal_Cap pin
100% output duty cycle
2.95 3.25 3.3
V
V_CTHM-MIN
Sawtooth min. voltage threshold at
Thermal_Cap pin
0% output duty cycle
0.325 0.4 0.493 V
I_CTHM
Thermal_Cap pin output current
PWM Dimming Control Interface
38.9 50
61
uA
V_DIM-LED-ON
DIM pin voltage threshold at LED ON
V_DIM-LED-OFF
DIM pin voltage threshold at LED OFF
Dynamic Headroom Control Output
V_DMIN = 0V
V_THERMAL = V_CC
V_DMIN = 0V
V_THERMAL = V_CC
1.19
V
1.3
V
V_OutP-MAX
V_OutP-MIN
V_LEDFB-LED-ON
V_{LEDFB-SYS-RST}
OutP pin max. output voltage
OutP pin min. output voltage
IoutP = 1 mA current sink
VLedFB pin voltage threshold at LED ON
System restart VLedFB pin voltage threshold for Measure at VLedFB pin
system restart
V_CC-0.5
V
0.3
V
2.4
2.5 2.58
V
1.2
V
LED Current Regulator
V_GDx-MAX
V_GDx-MIN
I_GDx-MAX
I_DRx
GDx gate driver max. output voltage
GDx gate driver min. output voltage
GDx gate driver short circuit current
DRx pin input current
Fault Detection and Handling
GDx short to GND
V_DRx = 10V
V_DRx = 100V
4.73 V_CC–1
V
0.115 0.127 V
8
mA
25
29 μA
55
70 μA
V_OVP-TH
V_SHORTFAULT
V_OPENFAULT
I_FAULT-CAP
I_{FAULT-CAP-OVP}
DRx Pin over-voltage protection threshold
DRx short fault threshold
SEx open fault threshold
FAULT_CAP pin output current
FAULT_CAP pin output current at DRx over-
voltage
Measure at DRx pin
Any V_DRx < 2.5V
Measure at SEx pin
All V_DRx < V_OVP-TH
Any V_DRx ≥ V_OVP-TH
18
19
21
V
8.35 8.4 9.75 V
30
mV
25
uA
105
uA
V_FAULT-CAP
FAULT-CAP pin voltage threshold at fault timer V_FAULT-CAP rising
expire
3.6
V
R_Faultb
Faultb pin to GND resistance
Thermal Protection
LED fault = TRUE
110
Ω
T_OTM-TH
Over Temperature Monitor Threshold
T_OTM-HYS
Over Temperature Monitor Hysteresis
T_SD
Thermal shutdown temperature
T_SD-HYS
Thermal shutdown temperature hysteresis
Thermal Resistance
θ_JA
Junction to Ambient ⁽²⁾
θ_JC
Junction to Case ⁽²⁾
T_J rising
T_J falling
TSSOP-28 Package
125
°C
20
°C
165
°C
20
°C
33.5
°C/W
6
°C/W
(2) Measurements are performed on a 4 layer JEDEC board with 10 vias provided under the exposed pad. See JESD51-1 to JESD51-11.
The value of θ_JA is specifically dependent on the PCB trace area, trace material and the number of layers and thermal vias.
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