Datasheet

UG-204 Evaluation Board User Guide
Rev. A | Page 6 of 12
OTHER INFORMATION ABOUT THE EVALUATION BOARD PCB LAYOUT
As seen in Figure 1, the layout of this evaluation board is not
optimized for the smallest PCB area. It is laid out in such a way
that any of the components can be desoldered and replaced
easily with different components with a hand soldering iron so
that the user can modify the existing design without acquiring
a new PCB layout. The physical size of the compensation
components is 0603, which is selected for its ease of hand
soldering when reworking the board is needed. The size of
these components can be 0402 or even smaller in the final
design. Note that there are extra place holders for input bulk
capacitors, output filter capacitors, and MOSFETs. The user
can remove, add, or change any of these power components
to achieve a particular design objective. The track functions,
where TRK1 and TRK2 are pulled up to VCCO through 0 Ω
dummy resistors, are not used on this evaluation board. If a
tracking function is needed, the user can remove the 0 Ω
dummy resistors and add external resistive components to
obtain the desired tracking function. Dummy 0 Ω resistors
are placed at the driver gates, DHx and DLx, for evaluation
purpose only and can be removed in the final design. Also,
the configuration of this evaluation board can be modified
to obtain a single output dual-phase operation. Furthermore,
many test points are placed on the evaluation board so that the
user can easily evaluate the performances of the ADP1850 with
an oscilloscope. See Figure 8, the evaluation board schematic,
for more information.