MP4571 – 60V, 1A, SYNCHRONOUS STEP-DOWN CONVERTER
TYPICAL APPLICATION CIRCUITS
C4
0.1µF
L3
15µH
5V/1A
U1
IN
2
8
SW
FB
VOUT
GND
VEMI
C2A
22µF
C2B
22µF
CIN9
22µF
C1A C1B C1C
C1D
R1
100kΩ
R4
41.2kΩ
10µF 10µF 0.1µF 0.1µF
1210 1210 0603
0603
R6
20kΩ
GND
EN
4
5
12
EN
PG
D1
R5
7.68kΩ
MP4571
BZT52C6V2
3
6
FREQ
PG
R11
76.8kΩ
R9
100kΩ
11
VCC
CCM/SYNCO
CCM/SYNCO
C3
1µF
R10
100kΩ
JP1
1
2
Figure 8: Typical Application Circuit
L1
L2
5V to 60V
DFE201612E-R24M
FDSD0402-H-4R7M
4.7µH
240nH
VIN
VEMI
CIN1 CIN2 CIN3 CIN4 CIN5 CIN6
CIN7 CIN8
CIN9
22µF
C1A C1B C1C C1D
1nF 10nF 1nF 10nF 1µF 1µF
10µF 10µF
10µF 10µF 0.1µF 0.1µF
0603 0603 0603 0603 0805 0805
1210 1210 0603
1210
1210
0603
GND
C4
0.1µF
L3
15µH
5V/1A
U1
IN
VIN
2
VOUT
8
SW
VOUT
GND
R23
10Ω/0603
C2A
C2B
C2C C2D C2E C2F
1nF 10nF 1nF 10nF
22µF 22µF
R1
100kΩ
R4
41.2kΩ
R6
20kΩ
C12
0.1µF/100V
12
4
EN
PG
FB
EN
PG
D1
R5
7.68kΩ
MP4571
BZT52C6V2
3
6
5
FREQ
R11
R9
100kΩ
76.8kΩ
C10 R20
VOUT
0.1µF 10Ω
CCM/
SYNCO
11
VCC
CCM/SYNCO
R10
100kΩ
C3
1µF
C11 R21
JP1
0.1µF 10Ω
1
2
Figure 9: Typical Application Circuit with EMI Filters
MP4571 Rev. 1.1
2/22/2023
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