LX7302 Evaluation Board
Microsemi Proprietary and Confidential. LX7302 User Guide Revision 2.0
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Evaluation Board Operation
The LX7302 evaluation board contains a single LX7302 device and components necessary to provide four
output voltages at a maximum current of 30 A. Input voltages up to 25 V are supported. The input
supply source should be voltage-limited to 25 V maximum to protect the input capacitors, which are
rated at 25 V.
As configured, the evaluation board supports a user-programmable VID mode; however, the External
Reference mode is supported by changing four component values. See
Test Considerations (see page 10
for further details.
)
All input and output connections can be made using clip connections to on-board test points. In
addition, through-hole connections to accommodate 16 AWG wires are provided for high-output
current testing.
The following table describes the test point descriptions for the evaluation circuit. Please refer to this
table for evaluation board setup.
Table 1 • Evaluation Board I/O Connector and Test Point Reference
Reference
Description
TP1
Switch node monitor point. Used to monitor switching output.
TP2
LX7302 UG pin monitor. Used to monitor upper FET gate signal.
TP3
LX7302 LG pin monitor. Used to monitor lower FET gate signal.
TP4
LX7302 POK pin monitor. Pulled up to VCC through a 10K resistor. Used to monitor Power OK indicator.
TP5
VOUT RTN. Connection for load return and monitor point for output voltage (–). Five 16 AWG through-hole
connections provided for high-current load return.
TP6
VOUT (+). Output positive connect to load, and monitor point for output voltage (+). Five 16 AWG through-hole
connections provided for high-current load return.
TP7
FCCM/PSM input. Control for LX7302 power saver mode. A voltage greater than 2.5 V on this pin places the
LX7302 in forced continuous conduction mode (FCCM) operation. A voltage less than 0.5 V on this pin places
the LX7302 in power saver mode (PSM) operation. See the LX7302 datasheet for details regarding these
functions.
TP8
Enable input. Enable control for the LX7302. A voltage greater than 2.5 V on this pin will disable the LX7302.
TP9
External reference input. A 0 V to 2.2 V input to this pin controls the output voltage when in external reference
mode. As configured, this mode is disabled, but it may be enabled by changing four components on the
evaluation board. See
for further details.
Test Considerations (see page 10)
TP14
LX7302 VCC input. Connect a 5 V ±10% source capable of 200 mA to this test point.
TP15
LX7302 VCC return. Connect the 5 V supply return to this test point.
TP16
5 V to 25 V input. Connect a 5 V to 25 V supply source capable of a 10 A current. The supply source current is
based on an as-configured maximum output voltage of 1.3 V; if higher output voltages are used, a supply of
higher current capability may be needed.
TP17
5 V to 20 V input return.
TP18
LX7302 VID 1 input. One of two VID control inputs. See the LX7302 datasheet for details.
TP19
LX7302 VID 0 input. One of two VID control inputs. See the LX7302 datasheet for details.
TP20
Evaluation board power ground. Used for measurement reference.
TP21
Evaluation board power ground. Used for measurement reference.
JB1
Droop control enable/disable. With JB1 installed, the LX7302 voltage droop function is disabled. Removing JB1
jumper enables the droop function. See the LX7302 datasheet for details.
