L6981 datasheet(16/49 Pages) STMICROELECTRONICS

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6.4.4

Load regulation for low consumption mode and low noise mode part number

Figure 16 and Figure 17 report the load regulation to highlight the gap, given by the different regulation strategy,

at the light-load between LNM and LCM part numbers. When the required IOUT is higher than the threshold

defined in the Low consumption mode (LCM) paragraph, the behavior of the different part numbers is the same.

Figure 16. Load regulation for LCM and LNM. VIN = 24 V; VOUT = 5 V; FSW = 400 KHz - linear scale

-0.5

0.5

1.5

2.5

0.2

0.4

0.6

0.8

1.2

1.4

IOUT [A]

VIN = 24 [V]; VOUT = 5 [V]; FSW = 400 [KHz]

LCM

LNM

Figure 17. Load regulation for low noise mode. VIN = 24 V; VOUT = 5 V; FSW = 400 KHz - log scale

-0.5

0.5

1.5

2.5

0.0001

0.001

0.01

0.1

IOUT [A]

VIN = 24 [V]; VOUT = 5 [V]; FSW = 400 [KHz]

LCM

LNM

6.5

Overvoltage protection

The overvoltage is a second level protection, and it should never be triggered in normal operating conditions if the

system is properly dimensioned. In other words, the selection of the external power components and the dynamic

performance determined by the compensation network should guarantee an output voltage regulation within the

overvoltage threshold even during the worst-case scenario in terms of load transitions. The protection is reliable

and able to operate even during normal load transitions for a system whose dynamic performance is not in line

with the load dynamic request. Consequently, the output voltage regulation would be affected.

L6981

Overvoltage protection

DS13554 - Rev 1

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