LM5005EVAL National Semiconductor, LM5005EVAL Datasheet - Page 2

• Manufacturer Part Number: LM5005EVAL
• Description: BOARD EVALUATION LM5005
• Manufacturer: National Semiconductor

Specifications of LM5005EVAL

• Main Purpose: DC/DC, Step Down
• Outputs And Type: 1, Non-Isolated
• Voltage - Output: 5V
• Current - Output: 2.5A
• Voltage - Input: 7 ~ 75V
• Regulator Topology: Buck
• Frequency - Switching: 300kHz
• Board Type: Fully Populated
• Utilized Ic / Part: LM5005
• Lead Free Status / RoHS Status: Not applicable / Not applicable
• Power - Output: -

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be reasonably sure that it will affect the efficiency adversely.
Few parameters can be incorrect in a switching power supply
without creating losses and potentially damaging heat.
OVER CURRENT PROTECTION
The evaluation board is configured with over-current protec-
tion. The output current is limited to approximately 3.8A. The
thermal stress is quite severe while in an overloaded condi-
tion, limit the duration of the overload and provide sufficient
cooling (airflow).
SYNCHRONIZATION
A SYNC pin has been provided on the evaluation board. This
pin can be used to synchronize the regulator to an external
clock or multiple evaluation boards can be synchronized to-
gether by connecting their SYNC pins together. Refer to the
LM5005 datasheet for complete information.
Performance Characteristics
EFFICIENCY PLOTS
Figure 1 shows the conversion efficiency versus output cur-
rent for several input voltage conditions.
TURN-ON WAVEFORM
When applying power to the LM5005 evaluation board a cer-
tain soft-start sequence occurs. Figure 2 shows the output
voltage during a typical start-up sequence.
FIGURE 1.
30044002
2
Conditions: Input Voltage = 36VDC, Output Current = 2A
Trace 1: Output Voltage Volts/div = 2V
Horizontal Resolution = 500 µsec/div
OUTPUT RIPPLE WAVEFORM
Figure 3 shows the output voltage ripple. This measurement
was taken with a very short ground clip and 20MHZ bandwidth
limiting.
Conditions: Input Voltage = 36VDC Output Current = 2A Bandwidth Limit =
20MHz
Trace 1: Output Ripple Voltage Volts/div = 50mV
Horizontal Resolution = 2 µsec/div
FIGURE 2.
FIGURE 3.
30044003
30044004