Datasheet
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 V
EN
= 0V 7.2 11 14.7 uA
Analog Dimming Control Interface
V
CTHM-MAX
Sawtooth max. voltage threshold at 2.95 3.25 3.3 V
Thermal_Cap pin
100% output duty cycle
V
CTHM-MIN
Sawtooth min. voltage threshold at 0.325 0.4 0.493 V
Thermal_Cap pin
0% output duty cycle
I
CTHM
Thermal_Cap pin output current 38.9 50 61 uA
PWM Dimming Control Interface
V
DIM-LED-ON
DIM pin voltage threshold at LED ON V
DMIN
= 0V 1.19 V
V
THERMAL
= V
CC
V
DIM-LED-OFF
DIM pin voltage threshold at LED OFF V
DMIN
= 0V 1.3 V
V
THERMAL
= V
CC
Dynamic Headroom Control Output
V
OutP-MAX
OutP pin max. output voltage V
CC
-0.5 V
V
OutP-MIN
OutP pin min. output voltage IoutP = 1 mA current sink 0.3 V
V
LEDFB-LED-ON
VLedFB pin voltage threshold at LED ON 2.4 2.5 2.58 V
V
LEDFB-SYS-RST
System restart VLedFB pin voltage threshold for Measure at VLedFB pin 1.2 V
system restart
LED Current Regulator
V
GDx-MAX
GDx gate driver max. output voltage 4.73 V
CC
–1 V
V
GDx-MIN
GDx gate driver min. output voltage 0.115 0.127 V
I
GDx-MAX
GDx gate driver short circuit current GDx short to GND 8 mA
I
DRx
DRx pin input current V
DRx
= 10V 25 29 μA
V
DRx
= 100V 55 70 μA
Fault Detection and Handling
V
OVP-TH
DRx Pin over-voltage protection threshold Measure at DRx pin 18 19 21 V
V
SHORTFAULT
DRx short fault threshold Any V
DRx
< 2.5V 8.35 8.4 9.75 V
V
OPENFAULT
SEx open fault threshold Measure at SEx pin 30 mV
I
FAULT-CAP
FAULT_CAP pin output current All V
DRx
< V
OVP-TH
25 uA
I
FAULT-CAP-OVP
FAULT_CAP pin output current at DRx over- Any V
DRx
≥ V
OVP-TH
105 uA
voltage
V
FAULT-CAP
FAULT-CAP pin voltage threshold at fault timer V
FAULT-CAP
rising 3.6 V
expire
R
Faultb
Faultb pin to GND resistance LED fault = TRUE 110 Ω
Thermal Protection
T
OTM-TH
Over Temperature Monitor Threshold 125 °C
T
OTM-HYS
Over Temperature Monitor Hysteresis 20 °C
T
SD
Thermal shutdown temperature T
J
rising 165 °C
T
SD-HYS
Thermal shutdown temperature hysteresis T
J
falling 20 °C
Thermal Resistance
θ
JA
Junction to Ambient
(2)
TSSOP-28 Package 33.5 °C/W
θ
JC
Junction to Case
(2)
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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