Texas Instruments LM3434 Evaluation Board LM3434SQ-20AEV/NOPB LM3434SQ-20AEV/NOPB Scheda Tecnica
Codici prodotto
LM3434SQ-20AEV/NOPB
LM3434
HS
HO
BST
V
CC
LO
L
S
C
SP
C
SN
BST
2
D
MO
D
IMR
V
EE
C
O
MP
SS
T
ON
ADJ
EN
DIM
V
IN
C
G
N
D
0.47
P
F
2.2
P
F
0.01
P
F
-12V
GND
4.7
P
F
+3.3V
DIM
44.2k
0.1
P
F
ADJ
-12V
270 pF
22
P
F
6
P
H
0.01
LED CATHODE
LED ANODE
LED
EN
Q1
Q2
Q3
SNVS619B – MARCH 2010 – REVISED MAY 2013
Common Anode Capable High Brightness LED Driver with High Frequency Dimming
Check for Samples:
1
FEATURES
DESCRIPTION
The LM3434 is an adaptive constant on-time DC/DC
2
•
Operating Input Voltage Range of –9V to -30V
buck (step-down) constant current controller (a true
w.r.t. LED Anode
current source). The LM3434 provides a constant
•
Control Inputs are Referenced to the LED
current for illuminating high power LEDs. The output
Anode
configuration allows the anodes of multiple LEDs to
be tied directly to the ground referenced chassis for
be tied directly to the ground referenced chassis for
•
Output Current Greater than 6A
maximum heat sink efficacy. The high frequency
•
Greater than 30kHz PWM Frequency Capable
capable architecture allows the use of small external
•
Negative Output Voltage Capability Allows
passive components and no output capacitor while
LED Anode to be Tied Directly to Chassis for
maintaining low LED ripple current. Two control
Maximum Heat Sink Efficiency
inputs are used to modulate LED brightness. An
analog current control input is provided so the
analog current control input is provided so the
•
No Output Capacitor Required
LM3434 can be adjusted to compensate for LED
•
Up to 1MHz Switching Frequency
manufacturing variations and/or color temperature
•
Low I
Q
, 1mA Typical
correction. The other input is a logic level PWM
control of LED current. The PWM functions by
control of LED current. The PWM functions by
•
Soft Start
shorting out the LED with a parallel switch allowing
•
Adaptive Programmable ON Time Allows for
high PWM dimming frequencies. High frequency
Constant Ripple Current
PWM
dimming
allows
digital
color
temperature
•
24-Pin WQFN Package
control,
interference
blanking,
field
sequential
illumination,
and
brightness
control.
Additional
APPLICATIONS
features include thermal shutdown, V
CC
under-voltage
lockout, and logic level shutdown mode. The LM3434
•
Projection Systems
is available in a low profile 24-pin WQFN package.
•
Solid State Lighting
•
Automotive Lighting
TYPICAL APPLICATION CIRCUIT
1
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2
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PRODUCTION DATA information is current as of publication date.
Copyright © 2010–2013, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.