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DO NOT LOOK DIRECTLY AT OPERATING LED
This Circuit Produces Light that Can Damage Eyes.
DESCRIPTION
Demonstration circuit 1166A is a 48V Buck-Mode LED
Driver featuring the
quency buck-mode converter specifically designed to drive
up to 10 LEDs in series from a 48V DC source. Series con-
nection of the LEDs provides identical LED currents of up to
50mA, resulting in uniform brightness and eliminating the
need for ballast resistors. A fixed frequency current mode
architecture results in stable operation over a wide range
of input voltage and load condition. The high switching
frequency allows using tiny components for the circuit.
PERFORMANCE SUMMARY
SYMBOL
PARAMETER
V
Input Supply Range
IN
D
Maximum Duty Cycle
MAX
I
Quiescent Current in Shutdown
QSHDN
f
Switching Frequency
SW
V
VREG Pin Voltage
REG
EFF
Efficiency
Arrow.com.
Downloaded from
WARNING!
LT
3590. The LT3590 is a fixed fre-
®
CONDITIONS
V
IN
1mA Load on VREG Pin
V
IN
DEMO MANUAL DC1166A
48V Buck-Mode LED Driver
The LT3590 data sheet gives complete descriptions of the
part, operation and application information. The data sheet
must be read in conjunction with this quick start guide for
working on or modifying the demo circuit 1166A.
Design files for this circuit board are available at
http://www.linear.com/demo/DC1166A
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
Specifications are at T
= 25°C
A
= 48V
= 48V; V
= 30V; I
= 50mA
LED
LED
LT3590
MIN
TYP
MAX
4.5
55
90
15
20
650
850
1050
3.1
3.3
3.5
90
UNITS
V
%
µA
KHz
V
%
dc1166af
1
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Summary of Contents for Linear Technology DC1166A
- Page 1 A fixed frequency current mode L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear architecture results in stable operation over a wide range Technology Corporation. All other trademarks are the property of their respective owners.
-
Page 2: Quick Start Procedure
DEMO MANUAL DC1166A QUICK START PROCEDURE Demonstration circuit 1166A is easy to set up to evalu- 3. With power off, connect LEDs to LED+ and LED–. ate the performance of the LT3590. Refer to Figure 1 for 4. Turn on the power at the input. - Page 3 DEMO MANUAL DC1166A QUICK START PROCEDURE Figure 1. Proper Measurement Equipment Setup dc1166af Arrow.com. Arrow.com. Arrow.com. Downloaded from Downloaded from Downloaded from...
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Page 4: Parts List
DEMO MANUAL DC1166A PARTS LIST ITEM REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components CAP , 0805 0.47µF 10% 100V X7R MURATA GRM21BR72A474KA73BL CAP , 0805 1µF 10% 50V X7R MURATA GRM21BR71H105K INDUCTOR, 330µH COILCRAFT LPZ3010-334MR RES, 0402 4.02Ω 1% 1/16W... -
Page 5: Schematic Diagram
Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights. - Page 6 Linear Technology Corporation (LTC) provides the enclosed product(s) under the following AS IS conditions: This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT OR EVALUATION PURPOSES ONLY and is not provided by LTC for commercial use. As such, the DEMO BOARD herein may not be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety measures typically found in finished commercial goods.
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