LM5177DCPR datasheet(26/60 Pages) TI2

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LPF

VT+(DTRK)

TRK

Control

DTRK

ATRK /SS

V(REF)

DAC

Erro r

Amplifier

V(REF)

COMP

Figure 7-14. Output Voltage Tracking Functional Block Diagram

7.3.10 Slope Compensation

The LM5177 provides a slope compensation pin to ensure stable operation and the best transient performance

over a wide operating range. According to peak current mode control theory, slope compensation is required

at operation with duty cycle greater than 50%. The value for the resistor on the SLOPE pin is calculated with

Equation 11.

RSLOPE = LRCS ×50×106VAs

(11)

During the design process, consider the following guidelines for the slope compensation:

1. The quotient of peak current sense resistor, R(CS), and the main inductor, L, need to be smaller than the

factor given by Equation 12.

RCSL <1V ×fsw

Vo×10

(12)

where

• VO is the maximum output voltage of a system with dynamic voltage changes.

2. The quotient is within the limits given by Equation 13.

100 Hz < RCSL < 8000 Hz

(13)

7.3.11 Configurable Soft Start

The soft-start feature allows the regulator to gradually reach the steady-state operating point, thus reducing

start-up stresses and surges.

The LM5177 features an adjustable soft start that determines the charging time of the output. The soft-start

feature limits inrush current as a result of high output capacitance to avoid an over-current condition.

LM5177

SNVSBU4F – JUNE 2022 – REVISED JANUARY 2025

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LM5177DCPR Datasheet(PDF) 26 Page - Texas Instruments