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dc1934af
DEMO MANUAL DC1934A
DESCRIPTION
LTM8053
40V, 3.5A Step-Down
μModule Regulator
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.
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.
BOARD PHOTO
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
