LM5071HEEVAL National Semiconductor, LM5071HEEVAL Datasheet - Page 8

• Manufacturer Part Number: LM5071HEEVAL
• Manufacturer: National Semiconductor

Specifications of LM5071HEEVAL

• Lead Free Status / Rohs Status: Not Compliant

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Performance Characteristics
Horizontal Resolution: 2 ms/Div.
Trace 1: RTN pin of the LM5071 IC, 1V/Div.
Trace 2: Softstart pin, 2V/Div.
Trace 3: Test board input current, 200 mA/Div.
STEP RESPONSE
Figure 8 shows the step load response at V
Horizontal Resolution: 200 µs/Div.
Trace 1: Output voltage (AC coupled), 200 mV/Div.
Trace 2: Output current (DC coupled), 0.5A/Div.
FIGURE 7. Shorted Output Fault Condition / Automatic
(Continued)
FIGURE 8. Regulator Response to Step Load
Re-try
IN
20175809
20175810
= 48V.
8
RIPPLE VOLTAGE/CURRENT
Figure 9 shows the output ripple voltage and input ripple
current for 48V input voltage and 3.3A output.
Horizontal Resolution: 0.2 ms/Div.
Trace 1: Output voltage (AC coupled), 20 mV/Div.
Trace 2: Input current (AC coupled), 50 mA/Div.
FLYBACK TRANSFORMER WAVEFORMS
Figure 10 and Figure 11 show the typical drain to source
voltage of the main switch Q1 and the reverse voltage of
rectifier diode D5, respectively, at 48V input voltage and
3.3A output.
Horizontal Resolution: 1 µs/Div.
Trace 1: Drain to source voltge of main switch Q1, 50V/Div.
FIGURE 10. Flyback Main Switch Drain Voltage
FIGURE 9. Ripple Currents and Voltages
Waveform
20175812
20175811