L6982 datasheet(16/48 Pages) STMICROELECTRONICS

Teilenummer	L6982

Bauteilbeschribung	38 V, 2 A synchronous step-down converter with low quiescent current

PDF	48 Pages

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Hersteller	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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6.4.4

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

Figure belows 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

IOUT [A]

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

-1

-0.5

0.5

1.5

2.5

0.2

0.4

0.6

0.8

1.2

1.4

1.6

1.8

LCM

LNM

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

IOUT [A]

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

-1

-0.5

0.5

1.5

2.5

0.0001

0.001

0.01

0.1

LCM

LNM

6.5

Overvoltage protection

The overvoltage protection monitors the FB pin and enables the low-side MOSFET to discharge the output

capacitor if the output voltage is 20% (typ.) over the nominal value.

L6982

Overvoltage protection

DS13683 - Rev 1

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