LM5010 EVAL National Semiconductor, LM5010 EVAL Datasheet - Page 2

• Manufacturer Part Number: LM5010 EVAL
• Description: BOARD EVALUATION LM5010
• Manufacturer: National Semiconductor

Specifications of LM5010 EVAL

• Main Purpose: DC/DC, Step Down
• Outputs And Type: 1, Non-Isolated
• Voltage - Output: 10V
• Current - Output: 1A
• Voltage - Input: 12 ~ 75V
• Regulator Topology: Buck
• Frequency - Switching: 480kHz
• Board Type: Fully Populated
• Utilized Ic / Part: LM5010
• Lead Free Status / RoHS Status: Not applicable / Not applicable
• Power - Output: -

Board Layout and Probing
(Continued)
3) Use CAUTION when probing the circuit at high input
voltages. 75 volts is enough to produce shocks and sparks.
4) At maximum load current (1A), the wire size and length
used to connect the load becomes important. Ensure there is
not a significant drop in the wires.
Board Connection/Start-up
The input connections are made to the J1 connector. The
load is normally connected to the OUT1 and GND terminals
of the J3 connector. Ensure the wires are adequately sized
for the intended load current. Before start-up a voltmeter
should be connected to the input terminals, and to the output
terminals. The load current should be monitored with an
ammeter or a current probe. It is recommended that the input
voltage be increased gradually to 8V, at which time the
output voltage will be approximately 7V. If that indicates
correctly, then increase the input voltage to the minimum
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operating value of 12V, and proceed with evaluating the
circuit.
FIGURE 3. Efficiency vs V
IN
Low Ripple Output
The ripple voltage at OUT1 will range from ) 120 mVp-p (at
= 12V) to ) 650 mVp-p (at V
V
= 75V). If a low ripple
IN
IN
output is desired, connect the load to OUT2. The ripple at
this output varies from ) 10mVp-p to ) 60 mVp-p over the
input voltage range. However, the load regulation is not as
good at OUT2 as it is at OUT1 due to the presence of R4.
Increased Current Limit
The evaluation board current limit activates at a load current
of )1.3A. If it is desired to increase the current limit for a
particular application, R5 must be added to the board. Refer
to the data sheet to determine the appropriate value for this
resistor.
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FIGURE 2. Efficiency vs Load Current
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