LM5145 datasheet(44/60 Pages) TI1

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1 Ps/DIV

SW 10V/DIV

SYNCIN

1V/DIV

VIN = 48 V

FSW = 350 kHz

IOUT = 8 A

Figure 9-29. SW Node and SYNCIN Voltages

1 Ps/DIV

SW 10V/DIV

SYNCOUT 2V/DIV

VIN = 48 V

IOUT = 8 A

Figure 9-30. SW Node and SYNCOUT Voltages

Start 150 kHz

Stop 30 MHz

Margin

VIN = 48 V

VOUT = 12 V

6-A resistive load

Figure 9-31. CISPR 25 Class 5 Conducted EMI, 150

kHz to 30 MHz

Margin

Start 30 MHz

Stop 108 MHz

VIN = 48 V

VOUT = 12 V

6-A resistive load

Figure 9-32. CISPR 25 Class 5 Conducted EMI, 30

MHz to 108 MHz

9.3 Power Supply Recommendations

The LV5144 buck controller is designed to operate from a wide input voltage range from 5.5 V to 100 V. The

characteristics of the input supply must be compatible with the Absolute Maximum Ratings and Recommended

Operating Conditions. In addition, the input supply must be capable of delivering the required input current to the

fully-loaded regulator. Estimate the average input current with Equation 23.

OUT

(23)

where

• η is the efficiency

If the converter is connected to an input supply through long wires or PCB traces with a large impedance,

take special care to achieve stable performance. The parasitic inductance and resistance of the input cables

can have an adverse affect on converter operation. The parasitic inductance in combination with the low-ESR

ceramic input capacitors form an underdamped resonant circuit. This circuit can cause overvoltage transients

LV5144

SNVSCJ1 – AUGUST 2023

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