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A7987 数据表(PDF) 23 Page - STMicroelectronics

部件名 A7987
功能描述  61 V, 3 A asynchronous step-down switching regulator with adjustable current limitation for automotive
PDF  36 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

A7987 数据表(HTML) 23 Page - STMicroelectronics

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7
Demonstration board
In this section the A7987 demonstration board is described.
The default settings are:
•
Programmed VOUT = 3.3V
•
Max. IOUT = 3 A
•
FSW = 500 kHz
•
Soft-start 3.5 ms
•
VBIAS = VOUT
Figure 15. A7987 demonstration board schematic
C1
4.7uF
100V
R3
0R
R12
100k
C7
100nF
L2
4.7uH
R6
1k
C3
1uF
100V
C2
4.7uF
100V
C11
680pF
C9
47nF
R2
100k
R1
NM
TP4
VOUT
C4
1uF
100V
TP3
VIN
R4
0D1
STPS3L60
R14
0R
TP5
EN
+
C12
33uF
R7
7.5k
L1
10uH
R5
120
TP1
PGOOD
R13
N.M.
TP7
GND
C8
4.7nF
R8
47k
C5
47uF
TP6
GND
R9
NM
C10
22nF
U1
A7987
PGOOD
12
VIN
3 SS
6 SYNCH
7 FSW
10ILIM
11COMP
8
EN
5 FB9
GND
16
VCC
4 LX13
LX14
VIN
2 VBIAS
1
BOOT
15
TP
17
C13
100nF
C14
N.M.
TP2
SYNCH
R11
2.4k
SYNCH
VIN
VIN
VCC
EN
SS
FSW
ILIM
PGOOD
VBIAS
BOOT
LX
LX
FB
COMP
GND
TP
7
2
3
4
5
6
10
11
12
1
15
13
14
9
8
A7987
PGOOD
VOUT
GND
GND
EN
VIN
SYNCH
C1
R4
R8
R9
+
C12
C2
C3
C4
C10
L2
R1
L1
R3
C7
C13
R2
R14
R6
C14
R13
C11
C9
R5
C8
R7
R11
C5
D1
R10
Table 7. A7987 demonstration board component list
Reference
Part
Package
Note
Manufacturer P/N
C1
N.M.
C2
4.7 uF
1210
X7S/100 V/20%
MURATA GCM32DC72A475M
Alt: GRM31CC72A475M
C3, C4
1 uF
0805
X7S/100 V/10%
MURATA GCM21BC72A105K
Alt. GRM21BC72A105K
C5
47 uF
1210
X7R/6.3 V/10%
MURATA GCM32ER70J476K
Alt. GRM32ER7A476K
C7, C13
100 nF
0603
10 V
C8
4.7 nF
0603
X7R/16 V/10%
C9
47 nF
0603
X7R/16 V/10%
C10
22 nF
0603
X7R/16 V/10%
C11
680 pF
0603
NPO/50 V/5%
C12
33 uF
8mm, radial
63 V/Elect./1.7 Arms
PANASONIC EEHZA1J330P
C6, C14
N.M.
R2, R12
100 k
0603
1% tolerance
R3,R4, R14
0
0603
R5
120
0603
1% tolerance
A7987
Demonstration board
DS12928 - Rev 3
page 23/36



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