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DESCRIPTION
Demonstration circuit 1934A is a 40V, 3.5A step-down
μModule
regulator featuring the
®
board is designed for 5V output from a 5.6V to 40V input.
The wide input range allows a variety of input sources,
such as automotive batteries and industrial supplies. The
user adjustable features of the LTM8053 such as output
voltage, switching frequency, soft-start, and power good
can be changed on DC1934A simply by modifying the
appropriate resistors and/or capacitors. Two or more
LTM8053s can be paralleled to share load current equally.
The LTM8053 can be programmed to different operation
modes. The SYNC pin on the demo board is grounded
(JP1 at BURST position) by default for low ripple Burst
Mode
operation. Pulse-skipping mode, spread spectrum
®
mode, or synchronization mode can be selected respec-
tively by moving JP1 shunt to NON-BURST position and
adding different signals to SYNC terminal. See Quick Start
Procedure section for more details.
BOARD PHOTO
LTM
8053. The demo
®
DEMO MANUAL DC1934A
40V, 3.5A Step-Down
μModule Regulator
Figure 1 shows the efficiency of the circuit under different
input voltages in Burst Mode operation. The rated maximum
load current is 3.5A, while derating is necessary for certain
input voltage and thermal conditions. Figure 2 shows the
LTM8053 derating curve on DC1934A demo board. The
demo board has an optional EMI filter. To achieve high
EMI/EMC performance, the input EMI filter is required and
the input voltage should be applied at VIN_EMI terminal.
The LTM8053 data sheet gives a complete description of
the part, operation and application information. The data
sheet must be read in conjunction with this demo manual
for demo circuit 1934A.
Design files for this circuit board are available at
http://www.linear.com/demo/DC1934A
L, LT, LTC, LTM, Linear Technology, the Linear logo, μModule and Burst Mode are registered
trademarks of Linear Technology Corporation. All other trademarks are the property of their
respective owners.
LTM8053
dc1934af
1
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Summary of Contents for Linear Technology DC1934A
- Page 1 JP1 shunt to NON-BURST position and adding different signals to SYNC terminal. See Quick Start L, LT, LTC, LTM, Linear Technology, the Linear logo, μModule and Burst Mode are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their Procedure section for more details.
- Page 2 **Derating is necessary for certain V and thermal conditions. = 12V = 24V 0.001 0.01 LOAD CURRENT (A) DC1934A F01 Figure 1. LTM8053 Demo Circuit DC1934A Efficiency vs Load Current (f = 1MHz, V = 5V, Burst Mode Operation) 0 LFM AMBIENT TEMPERATURE (°C) DC1934A F02 Figure 2.
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Page 3: Quick Start Procedure
DEMO MANUAL DC1934A QUICK START PROCEDURE Demonstration circuit 1934A is easy to set up to evalu- 5. Check for the proper output voltage (V = 5V). ate the performance of the LTM8053. Refer to Figure 3 NOTE. If there is no output, temporarily disconnect the... - Page 4 DEMO MANUAL DC1934A QUICK START PROCEDURE Figure 3. Proper Measurement Equipment Setup dc1934af...
- Page 5 DEMO MANUAL DC1934A QUICK START PROCEDURE Figure 4. Measuring Output Ripple –20 –40 –60 –80 –100 –120 FREQUENCY (MHz) DC1934A F05 Figure 5. DC1934A Output Noise Spectrum, V = 12V, V = 5V, I = 3.5A dc1934af...
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Page 6: Parts List
DEMO MANUAL DC1934A PARTS LIST ITEM REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components CAP ., X7R, 0.1μF, 25V, 10% 0603 MURATA, GRM188R71E104KA01D CAP ., X7R, 4.7μF, 50V, 10% 1206 MURATA, GRM31CR71H475KA12L CAP ., X5R, 100μF, 6.3V, 20% 1206 MURATA, GRM31CR60J107ME39L CAP ., X5R, 4.7μF, 6.3V, 10% 0603... -
Page 7: 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 8 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.
- Page 9 Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Analog Devices Inc. DC1934A...
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