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Linear Technology DC1274A Demo Manual
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Linear Technology DC1274A Demo Manual

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DESCRIPTION
Demo circuit DC1274A features the LTM
step-down constant current μModule
demonstration circuit is designed to drive a single LED
or string of LEDs at up to 1A from a wide input voltage
range. The maximum LED string voltage is 13V and the
minimum voltage varies depending upon the BIAS pin sup-
ply arrangement. The demonstration circuit is assembled
with the BIAS pin connected to the LEDA pin.
The LTM8040 runs at 500kHz switching frequency by
default. DC1274A can be adjusted to raise the switching
PERFORMANCE SUMMARY
PARAMETER
Input Voltage Range
Output Current (I
)
LED
Switching Frequency
Maximum Output Voltage (V
), Open LED Voltage
LEDA
BOARD PHOTO
DEMO MANUAL DC1274A
8040 36V, 1A
frequency, lower the LED current, and implement PWM
®
®
LED driver. The
dimming. The shutdown feature can be examined by con-
necting the shutdown terminal to ground. The LTM8040
data sheet must be read in conjunction with this demo
manual prior to working on or modifying demo circuit
DC1274A.
Design files for this circuit board are available at
http://www.linear.com/demo
L, LT, LTC, LTM, μModule, Linear Technology and the Linear logo are registered trademarks of
Linear Technology Corporation. All other trademarks are the property of their respective owners.
(T
= 25°C)
A
CONDITIONS/NOTES
I
= 1A, V
= 3.3V
LED
LEDA
R3 = Open
R2 = Open
LTM8040
36V, 1A Step-Down
µModule LED Driver
VALUE
4V to 36V
1A
500kHz
13V
dc1274af
1

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Summary of Contents for Linear Technology DC1274A

  • Page 1 The LTM8040 runs at 500kHz switching frequency by L, LT, LTC, LTM, μModule, Linear Technology and the Linear logo are registered trademarks of default. DC1274A can be adjusted to raise the switching Linear Technology Corporation. All other trademarks are the property of their respective owners.

  • Page 2: Quick Start Procedure

    DEMO MANUAL DC1274A QUICK START PROCEDURE DC1274A is an easy way to evaluate the LTM8040. Refer 4. Tie the shutdown terminal to ground in order to turn to the test procedures outlined below and Figure 1. the output off and examine the shutdown operation.
  • Page 3 DEMO MANUAL DC1274A QUICK START PROCEDURE SHDN OPTION – – – – Figure 1. Proper Measurement Equipment Setup 1000 OUTPUT CURRENT (mA) Figure 2. Efficiency with Single 3.3V LED at 1A. LED Current is Adjusted with ADJ Voltage dc1274af...
  • Page 4 DEMO MANUAL DC1274A PARTS LIST ITEM REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components CAP , 1210 2.2μF 10% 50V X7R TDK C3225X7R1H225K RES, 0402 100k 5% 1/16W VISHAY CRCW0402100KJNED IC, MODULE LINEAR TECH. LTM8040EV Optional Demo Circuit Components CAP , 0805 OPT...

  • 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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