Datasheet

Performance Characteristics

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Figure 5 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.

Figure 6 and Figure 7 show the drain voltage of Q1 with a 5A load. Figure 6 represents an input voltage of

36V and Figure 5 represents an input voltage of 72V.

Figure 8 shows the gate voltages of the synchronous rectifiers. The deadtime provided by the 20kΩ DLY

resistor is difficult to see at this timescale.

Conditions: Input Voltage = 36VDC Output Current = 5A Conditions: Input Voltage = 72VDC Output Current = 5A

Trace 1: Q1 drain voltage Volts/div = 10V Horizontal Trace 1: Q2 drain voltage Volts/div = 10V Horizontal

Resolution = 1µs/div Resolution = 1µs/div

Figure 6. Drain Voltage of Q1 With a 5A Load (input Figure 7. Drain Voltage of Q1 With a 5A Load (input

voltage of 36V) voltage of 72V)

Conditions: Input Voltage = 48VDC Output Current = 5A Upper Trace: SR1, Q4 gate Volts/div = 5V Middle Trace: HS, Q2

drain Volts/div = 20V Lower Trace: SR2, Q6 gate Volts/div = 5V Horizontal Resolution = 1µs/div

Figure 8. Gate Voltages of the Synchronous Rectifiers

AN-2043 LM5035C Evaluation Board SNVA433A–March 2010–Revised May 2013

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