LM5145 datasheet(36/60 Pages) TI2

Part #	LM5145

Description	LM25139 42V, Synchronous Buck DC/DC Controller With Dual Random Spread Spectrum for Advanced EMI Mitigation

PDF	60 Pages

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Manufacturer	TI2 [Texas Instruments]

Direct Link	https://www.ti.com

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36 / 60 page

CCOMP= 10

2π×fC×RCOMP= 10

2π×55kHz×20.5kΩ=1.4nF

(45)

Such a low capacitance value also helps to avoid output voltage overshoot when recovering from dropout

(when the input voltage is less than the output voltage setpoint and VCOMP is railed high).

3. Calculate CHF using Equation 46 to create a pole at the ESR zero and to attenuate high-frequency noise at

COMP. CBW (31pF) is the bandwidth-limiting capacitance of the error amplifier. CHF can not be significant

enough to be necessary in some designs. In this design, the high frequency capacitor is not necessary.

CHF= 1

2π×fESR×RCOMP−CBW

(46)

Note

Set a fast loop with high RCOMP and low CCOMP values to improve the response when recovering from

operation in dropout.

Note

For technical solutions, industry trends, and insights for designing and managing power supplies, see

also TI's technical articles.

LM25139

SLVSJ80 – OCTOBER 2025

www.ti.com

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LM5145 Datasheet(PDF) 36 Page - Texas Instruments