L6982 datasheet(33/48 Pages) STMICROELECTRONICS

部件名	L6982

功能描述	38 V, 2 A synchronous step-down converter with low quiescent current

PDF	48 Pages

Scroll/Zoom	100%

制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

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33 / 48 page

Figure 37. Efficiency VIN = 12 V; VOUT = 5 V; FSW = 0.4 MHZ (log scale)

VIN = 12 [V]; VOUT = 5 [V]; FSW = 400 KHz

= [A]

OUT

100

0.0001

0.001

0.01

0.1

LNM

LCM

Figure 38. Power losses VIN = 12 V; VOUT = 5 V; FSW = 0.4 MHZ

IN = 12 [V]; VOUT = 5 [V]; FSW = 400 KHz

= [A]

OUT

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

0.2

0.4

0.6

0.8

1.2

1.4

1.6

1.8

LCM

LNM

POUT

The following three figures show the efficiency and power losses acquired on the standard evaluation board of the

device, selecting the following output filter:

•

COUT:

–

1 x GRJ32EC71E226KE11 22 µF 25 V (Murata)

–

2 x C3216X7R1H106K160AC 10 µF 50 V (TDK)

•

Inductor:

–

MSS1038T-153ML (Coilcraft)

•

C8:

–

10 pF

L6982

Efficiency curves

DS13683 - Rev 1

page 33/48

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