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L6981 Scheda tecnica(PDF) 34 Page - STMicroelectronics

Il numero della parte L6981
Spiegazioni elettronici  38 V, 1.5 A synchronous step-down converter with low quiescent current
PDF  49 Pages
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Produttore elettronici  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6981 Scheda tecnica(HTML) 34 Page - STMicroelectronics

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Figure 37. Efficiency VIN = 12 V; VOUT = 5 V; FSW = 0.4 MHz (log scale)
0
10
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100
0.0001
0.001
0.01
0.1
1
IOUT [A]
VIN = 12 [V]; VOUT = 5 [V]; FSW = 400 [KHz]
LCM
LNM
Figure 38. Power losses VIN = 12 V; VOUT = 5 V; FSW = 0.4 MHz
0
1
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0
0.1
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0.8
0
0.2
0.4
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IOUT [A]
VIN = 24 [V]; VOUT = 5 [V]; F SW = 400 [KHz]
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 16 V (Murata)
–
1 x C3216X7R1H106K160AC 10 µF 50 V (TDK)
•
Inductor:
–
MSS1038T-223ML (Coilcraft)
•
C8:
–
10 pF
L6981
Efficiency curves
DS13554 - Rev 1
page 34/49



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