LM5020EVAL National Semiconductor, LM5020EVAL Datasheet - Page 4
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LM5020EVAL
Manufacturer Part Number
LM5020EVAL
Description
EVALUATION BOARD FOR LM5020
Manufacturer
National Semiconductor
Series
PowerWise®r
Specifications of LM5020EVAL
Main Purpose
DC/DC, Step Down
Outputs And Type
1, Isolated
Voltage - Output
3.3V
Current - Output
4.5A
Voltage - Input
30 ~ 75V
Regulator Topology
Buck
Board Type
Fully Populated
Utilized Ic / Part
LM5020
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Power - Output
-
Frequency - Switching
-
Other names
*LM5020EVAL
www.national.com
Performance Characteristics
Trace 1: Input Voltage, at 30VDC.
Volts/div = 20.0V
Trace 2: Output Voltage, at full load.
Volts/div = 2.0V
Trace 3: Output Current, at full load.
Amps/div = 2.0A
Horizontal Resolution = 1.0ms/div
Trace 1: V
Volts/div = 5.0V
Trace 2: V
Volts/div = 20.0V
Horizontal Resolution = 2.0ms/div
LOAD STEP RESPONSE
Figure 5 shows the load step response at Vin = 30VDC for
an instantaneous load change from 5% to full load. The input
voltage, output voltage and output current are shown.
RIPPLE VOLTAGE AND RIPPLE CURRENT
Figure 6 shows the output ripple voltage, the output ripple
current and the input ripple current relative to the LM5020
gate drive.
(Continued)
CC
IN
approaching 30VDC
pin with V
IN
= 30VDC, Load = 4.5A
FIGURE 3.
FIGURE 4.
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4
Trace 1: Input Voltage, at 30VDC
Volts/div = 20.0V
Trace 2: Output Voltage, at 3.3VDC
Volts/div = 2.0V
Trace 3: Load changing from 0.23A to 4.5A instantaneously
Amps/div = 2.0A
Horizontal Resolution = 1.0ms/div
Trace 1: Q1 gate drive at Vin = 48VDC
Volts/div = 20.0V
Trace 2: Output ripple voltage
Volts/div = 100mV
Trace 3: Output ripple current
Amps/div = 20.0mA
Trace 4: Input ripple current
Amps/div = 100mA
Horizontal Resolution = 2.0µs/div
FIGURE 5.
FIGURE 6.
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