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Linear Technology DC2251A Demo Manual

Ltm8065 40v, 2.5a silent switcher module regulator
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Description

Demonstration circuit 2251A is a 40V, 3.5A peak, 2.5A
continuous step-down μModule
LTM
8065. The demo board is designed for 5V output
®
from a 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
LTM8065 such as output voltage, switching frequency,
soft-start and power good can be changed on DC2251A
simply by modifying the appropriate resistors and/or
capacitors.
The LTM8065 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 SYNC position and adding
different signals to SYNC terminal. See Quick Start Pro-
cedure section for more details.
BoarD photo
regulator featuring the
®
DEMO MANUAL DC2251A
40V, 2.5A Silent Switcher
µModule Regulator
Figure 1 shows the efficiency of the circuit under differ-
ent input voltages in Burst Mode operation. The rated
maximum continuous load current is 2.5A, while derating
is necessary for certain input voltage and thermal condi-
tions. Figure 2 shows the LTM8065 derating curve on
DC2251A 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 LTM8065 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 2251A.
Design files for this circuit board are available at
http://www.linear.com/demo/DC2251A
L, LT, LTC, LTM, Linear Technology, Burst Mode, µModule and the Linear logo are registered
trademarks of Analog Devices, Inc. All other trademarks are the property of their respective
owners.
LTM8065
dc2251af
1

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Summary of Contents for Linear Technology DC2251A

  • Page 1 JP1 shunt to SYNC position and adding L, LT, LTC, LTM, Linear Technology, Burst Mode, µModule and the Linear logo are registered different signals to SYNC terminal. See Quick Start Pro- trademarks of Analog Devices, Inc. All other trademarks are the property of their respective owners.

  • Page 2: Performance Summary

    0.01 LOAD CURRENT (A) AMBIENT TEMPERATURE (°C) DC2251A F01 DC2251A F02 Figure 1. LTM8065 Demo Circuit DC2251A Efficiency vs. Load Figure 2. LTM8065 Demo Circuit DC2251A Current (f = 1MHz, V = 5V, Burst Mode Operation) Maximum Load Current Derating...
  • Page 3 DEMO MANUAL DC2251A Quick start proceDure 7. JP1 is placed on BURST position by default, for the low Please make sure that RT should be choseN to set the ripple Burst Mode operation. When JP1 is placed on LTM8065 switching frequency equal to or below the SYNC position, LTM8065 can operate in pulse-skipping lowest SYNC frequency.

  • Page 4: Parts List

    –60 –80 –100 –120 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 FREQUENCY (MHz) DC2251A F05 Figure 5. DC2251A Output Noise Spectrum, V = 12V, V = 5V, I = 2.5A, f = 1MHz parts List ITEM...
  • Page 5 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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