LM60430 datasheet(12/38 Pages) TI

12 / 38 page

Output Voltage, 2V/Div

2ms/Div

Input Voltage, 5V/Div

VCC, 5V/Div

PG, 5V/Div

VCC

EN-H

± VEN-HYS

EN-VCC-L

OUT

VOUT

EN-VCC-H

LM60440, LM60430

SNVSBN5A – FEBRUARY 2020 – REVISED JUNE 2020

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Feature Description (continued)

Figure 3. Precision Enable Behavior

Figure 4. Typical Start-up Behavior

VIN = 12 V, VOUT = 5 V, IOUT = 4 A

8.3.3 Current Limit and Short Circuit

The LM604x0 incorporates both peak and valley inductor current limit to provide protection to the device from

overloads and short circuits and limit the maximum output current. Valley current limit prevents inductor current

runaway during short circuits on the output, while both peak and valley limits work together to limit the maximum

output current of the converter. Cycle-by-cycle current limit is used for overloads, while hiccup mode is used for

sustained short circuits. Finally, a zero current detector is used on the low-side power MOSFET to implement

DEM at light loads (see the Glossary). The typical value of this current limit is found under IZC in the Electrical

Characteristics.

LM60430 Datasheet(PDF) 12 Page - Texas Instruments