LM5020EVAL National Semiconductor, LM5020EVAL Datasheet - Page 5

• 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

Performance Characteristics
TRANSFORMER WAVEFORMS
Figure 7, Figure 8 and Figure 9 show typical waveforms at
the junction of Q1 mosfet and the transformer primary wind-
ing. Also shown are typical waveforms at the junction of the
transformer secondary and the output rectifier, D3. Figure 7
reflects an input voltage of 30VDC and a load of 4.5A. Figure
8 reflects an input voltage of 50VDC with the same load.
Figure 9 reflects an input voltage of 75VDC, also at full load.
Trace 1: Drain of Q1 at Vin = 30VDC
Volts/div = 50.0V
Trace 2: Anode of D3
Volts/div = 10.0V
Horizontal Resolution = 0.5µs/div
Trace 1: Drain of Q1 at Vin = 50VDC
Volts/div = 50.0V
Trace 2: Anode of D3
Volts/div = 10.0V
Horizontal Resolution = 0.5µs/div
(Continued)
FIGURE 7.
FIGURE 8.
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Trace 1: Drain of Q1 at Vin = 75VDC
Volts/div = 50.0V
Trace 2: Anode of D3
Volts/div = 10.0V
Horizontal Resolution = 0.5µs/div
FIGURE 9.
20095312
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