X
X
R
R
P
P
6
6
1
1
4
4
2
2
S
S
y
y
n
n
c
c
h
h
r
r
o
o
n
n
o
o
u
u
s
s
S
S
t
t
e
e
p
p
-
-
D
D
o
o
w
w
n
n
C
C
o
o
n
n
t
t
r
r
o
o
l
l
l
l
e
e
r
r
w
w
i
i
t
t
h
h
D
D
D
D
R
R
M
M
e
e
m
m
o
o
r
r
y
y
T
T
e
e
r
r
m
m
i
i
n
n
a
a
t
t
i
i
o
o
n
n
July 2010
Rev. 0.0.2
Exar Corporation
www.exar.com
48720 Kato Road, Fremont CA 94538, USA
Tel. +1 510 668-7000 – Fax. +1 510 668-7001
GENERAL DESCRIPTION
The EXAR XRP6142 Evaluation kit is a fully
assembled and tested surface-mount PCB that
demonstrates the XRP6142 constant on-time
buck controller. The switch-mode power
supply regulator generates a preset 2.5V
output with a load of up to 15A.
The EVB kit requires a single input voltage V
IN
source of 4.5V to 5.5V if V
CC
is tied to V
IN
via
jumper J1. If V
CC
is supplied through an
independent 5V supply then the converter can
operate with V
IN
ranging from 3.3V to 5.5V.
E
E
V
V
A
A
L
L
U
U
A
A
T
T
I
I
O
O
N
N
B
B
O
O
A
A
R
R
D
D
M
M
A
A
N
N
U
U
A
A
L
L
FEATURES
•
Input Voltage Range of 4.5V – 5.5V
(V
CC
=V
IN
)
•
Input Voltage Range of 3.3V – 5.5V
(V
CC
=5V)
•
15A output current
•
Current limit with hiccup
•
Internal soft-start
•
Internal bootstrap diode
•
No compensation required
•
Precision Enable
EVALUATION BOARD SCHEMATICS
V IN
EXT
O FF
O N
C FF
1 nF
C s nb
3 .9 nF
Rs nb
0 .2 2 O hm
T P 1
T P 2
T P 3
T P 4
RV C C 1 0 O hm
Q T
Si4 1 6 4 DY
8
7
6
5
4
1
2
3
C 6
2 2 0 uF
J1
1
1
2
2
3
3
C 1
4 7 uF
C 2
4 7 uF
C 3
4 7 uF
C BST
0 .1 uF
C 4
0 .1 uF
C V C C
4 .7 uF
R1
3 8 .3 k, 1 %
R2
1 0 k, 1 %
C 5
2 2 0 uF
GN D
V I N
GN D
V O U T
V C C
E N
U1
XRP6142EL2.0-F
AGND
1
VTTREF
2
VDDQ/2
3
VREF
4
RE
FIN
5
FB
6
CS
G
N
D
7
IL
IM
8
PGND
9
GL
10
SW
11
GH
12
BS
T
13
VI
N
14
VC
C
15
EN
16
PAD
0
Q B
Si4 1 6 4 DY
8
7
6
5
4
1
2
3
L1
0 .8 2 uH
1
2
RLI M
2 .2 k
J2
1
1
2
2
3
3
C V C C 1
0 .1 uF
Figure 1: XRP6142 Evaluation Board Schematics
