LM5035CEVAL/NOPB National Semiconductor, LM5035CEVAL/NOPB Datasheet - Page 4

• Manufacturer Part Number: LM5035CEVAL/NOPB
• Description: EVAL BOARD FOR LM5035C
• Manufacturer: National Semiconductor

Specifications of LM5035CEVAL/NOPB

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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Performance Characteristics
TURN-ON WAVEFORMS
When applying power to the LM5035C evaluation board a
certain sequence of events occurs. Soft-start capacitor values
and other components allow for a minimal output voltage for
a short time until the feedback loop can stabilize without over-
shoot. Figure 1 shows the output voltage during a typical start-
up with a 48V input and a load of 5A. There is no overshoot
during startup.
OUTPUT RIPPLE WAVEFORMS
Figure 2 shows the transient response for a load change from
15A to 22.5A. The upper trace shows minimal output voltage
droop and overshoot during the sudden change in output cur-
rent shown by the lower trace.
Conditions: Input Voltage = 48VDC
Output Current = 5A
Trace 1: Output Voltage Volts/div = 500mV
Horizontal Resolution = 0.5ms/div
Conditions: Input Voltage = 48VDC
Output Current = 15A to 22.5A
Upper Trace: Output Voltage Volts/div = 50mV
Lower Trace: Output Current = 15A to 22.5A to 15A
Horizontal Resolution = 0.5ms/div
FIGURE 1.
FIGURE 2.
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Conditions: Input Voltage = 48VDC
Output Current = 30A
Bandwidth Limit = 20MHz
Trace 1: Output Ripple Voltage Volts/div = 20mV
Horizontal Resolution = 1µs/div
Figure 3 shows typical output ripple seen across the output
terminals (with standard 10µF and 1µF ceramic capacitors)
for an input voltage of 48V and a load of 30A. This waveform
is typical of most loads and input voltages.
Figures 4 and 5 show the drain voltage of Q1 with a 5A load.
Figure 4 represents an input voltage of 36V and Figure 5 rep-
resents an input voltage of 72V.
Figure 6 shows the gate voltages of the synchronous recti-
fiers. The deadtime provided by the 20kΩ DLY resistor is
difficult to see at this timescale.
Conditions: Input Voltage = 36VDC
Output Current = 5A
Trace 1: Q1 drain voltage Volts/div = 10V
Horizontal Resolution = 1µs/div
FIGURE 3.
FIGURE 4.
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