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L7981 Datasheet(PDF) 31 Page - STMicroelectronics

Part # L7981
Description  3 A step-down switching regulator
PDF  44 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L7981 Datasheet(HTML) 31 Page - STMicroelectronics

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L7981
Application informations
Doc ID 15182 Rev 3
31/44
6.7
Application circuit
In Figure 18 the demonstration board application circuit is shown.
Figure 18.
Demonstration board application circuit (rev 1.0)
Table 9.
Component list (rev 1.0)
Reference
Part number
Description
Manufacturer
C1
UMK325BJ106MM-T
10
μF, 50V
Taiyo Yuden
C2
GRM32ER61E226KE15
22
μF, 25V
Murata
C3
2.2 nF, 50V
C4
22 nF, 50V
C5
470 pF, 50V
C6
470 nF, 50V
R1
4.99 k
Ω, 1%, 0.1W 0603
R2
1.1 k
Ω, 1%, 0.1W 0603
R3
249
Ω, 1%, 0.1W 0603
R4
1.5 k
Ω, 1%, 0.1W 0603
R5
220 k
Ω, 1%, 0.1W 0603
D1
STPS3L40
3A DC, 40V
STMicroelectronics
L1
MSS1038-103NL
10
μH, 30%, 3.9A,
DCRMAX=35mΩ
Coilcraft



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