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L6981 Datasheet(PDF) 29 Page - STMicroelectronics

Part # L6981
Description  38 V, 1.5 A synchronous step-down converter with low quiescent current
PDF  49 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6981 Datasheet(HTML) 29 Page - STMicroelectronics

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9
Application board
The figure below shows the reference evaluation board schematic:
Figure 30. Evaluation board schematic
EN
VIN _L6981
R6
n.m.
C1
10
mF
L3
MPZ2012S221A
L1 33mH
+
C10
n.m.
C6
n.m.
TP3
VIN
TP2
CLK_IN
R5
n.m.
L4
4.7
mH
R1
0 Ohm
TP4
GND
J2
C8
10pF
C2
1
mF
U1
L6981CDR
SW
1
BOOT
2
VCC
3
FB
4
EN/ SY NC
5
AGND
6
VIN
7
PGND
8
TP6
VOUT
J1
L1 MSS1038T-333M
L
R2
402K
C11
4.7
mF
C5
10
mF
VIN _L6981
C14
C7
100nF
C13
n.m.
TP5
GND
C12
EMI FIlters. Optional Component
s
R4
10k
C9
n.m.
EN
C4
22
mF
TP1
EN
L2
n.m.
R3
82.5K
C3
1
mF 10V
4.7
mF
4.7
mF
The additional input filter (C11, L3, C12, L4, C14 and C10) limits the conducted emission on the power supply.
L6981
Application board
DS13554 - Rev 1
page 29/49



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