Linear Technology DC1274A - LTM8040EV Demo Board | 36V, 1A Buck LED Driver DC1274A DC1274A 数据表
产品代码
DC1274A
LTM8040
1
8040fa
TYPICAL APPLICATION
FEATURES
APPLICATIONS
DESCRIPTION
36V, 1A µModule
LED Driver and Current Source
The LTM
®
8040 is a fi xed frequency 1A step-down DC/DC
μModule
®
regulator designed to operate as a constant cur-
rent source. Internal circuitry monitors the output current
to provide accurate current regulation, which is ideal for
driving high current LEDs. High output current accuracy
is maintained over a wide current range, from 35mA to
1A, allowing a wide dimming range over an output volt-
age range of 2.5V to 13V. Unique PWM circuitry allows a
dimming range of 250:1, avoiding the color shift normally
associated with LED current dimming.
to provide accurate current regulation, which is ideal for
driving high current LEDs. High output current accuracy
is maintained over a wide current range, from 35mA to
1A, allowing a wide dimming range over an output volt-
age range of 2.5V to 13V. Unique PWM circuitry allows a
dimming range of 250:1, avoiding the color shift normally
associated with LED current dimming.
With its wide input range of 4V to 36V, the LTM8040 regu-
lates a broad array of power sources, from 4-cell batteries
and 5V logic rails to unregulated wall transformers, lead
acid batteries and distributed power supplies.
lates a broad array of power sources, from 4-cell batteries
and 5V logic rails to unregulated wall transformers, lead
acid batteries and distributed power supplies.
The LTM8040 is packaged in a thermally enhanced,
compact (15mm
compact (15mm
× 9mm × 4.32mm) molded land grid
array (LGA) package suitable for automated assembly
by standard surface mount equipment. The LTM8040 is
Pb-free and RoHS compliant.
by standard surface mount equipment. The LTM8040 is
Pb-free and RoHS compliant.
n
True Color PWM™ Delivers Constant Color with
250:1 Dimming Ratio
n
Wide Input Range: 4V to 36V
n
Up to 1A LED Current
n
Adjustable Control of LED Current
n
High Output Current Accuracy is Maintained Over a
Wide Range from 35mA to 1A
n
Open LED and Short-Circuit Protection
n
Grounded LED Cathode Connection
n
Small Footprint (15mm
× 9mm × 4.32mm)
Surface Mount LGA Package
n
Automotive and Avionic Lighting
n
Architectural Detail Lighting
n
Display Backlighting
n
Constant Current Sources
GND
LTM8040
8040 TA01
V
IN
SHDN
V
IN
*
11.5V TO 36V
1μF
215k
650kHz
650kHz
*RUNNING VOLTAGE. SEE APPLICATION INFORMATION
FOR START-UP REQUIREMENTS
FOR START-UP REQUIREMENTS
LEDA
LPWR
TWO WHITE LEDs
6V TO 9V
1A
6V TO 9V
1A
ADJ
PWM
RT
BIAS
Effi ciency
1A μModule LED Driver
OUTPUT CURRENT (mA)
0
0
EFFICIENCY (%)
10
30
40
50
70
200
400
8040 TA01b
20
80
100
90
60
600
800
1000
V
IN
= 12V
TWO 3.3V AT 1A LEDs
OUTPUT CURRENT ADJUSTED
WITH ADJ VOLTAGE
OUTPUT CURRENT ADJUSTED
WITH ADJ VOLTAGE
L, LT, LTC, LTM, μModule, Linear Technology and the Linear logo are registered trademarks
of Linear Technology Corporation. True Color PWM is a trademark of Linear Technology
Corporation. All other trademarks are the property of their respective owners.
of Linear Technology Corporation. True Color PWM is a trademark of Linear Technology
Corporation. All other trademarks are the property of their respective owners.