International Rectifier SupIRBuck IRDC3846, User Manual, Page: 4 / 14

IRDC3846-P1V2
Confidential
This evaluation board is a preliminary version meant for the engineering evaluation of the IR3846. Based on the results
of the continuing evaluation, this board can evolve and change without notice
AL
4/11/2013
4
Fig.
1:
Schematic
of
the
IR3846
evaluation
board
Single
point
of c
onne
ct
ion be
tw
ee
n
Po
w
er
Ground
a
nd Signa
l (
“a
na
log” ) Ground
Vr
ef
S_C
trl
1
C
130
0.
1uF
R
112
N/
S
M2
N/
S
R
113
N/
S
BOD
E
1
JU
M
PER
2
L1
250nH
W
E
74
4309025
PGD
RT
/S
y
nc
R7
0
N/
S
Vou
t+
123456
Vi
n 1
R1
16
0
C1
6
N/
S
O
ptio
nal
"1-b
it V
ID" c
ircu
it
OC
Sel
ec
t
4p
in
ju
m
per
1
2
3
4
Vp
Vout
C
119
N/
S
C1
20
N/
S
C
121
N/
S
C1
22
N/
S
O
ptio
nal
Pre-
Bias
tes
t ci
rcui
t
C
123
N/
S
FB
C
124
N/
S
C1
4
N/
S
Sy
nc
Vout
R1
0
0
C1
1
8.
2
nF
VPB
1
R
114 N/
S
R1
01
7.
5K
SW
1
C7
7
22
uF
R11
2.
7K
C7
9
N/
S
R1
9
N/
S
R12
127
R13
4.
02K
C1
14
N/
S
C7
8
N/
S
R1
5
20
Vs
ns
PVin
C
113
N/
S
R4
8
N/
S
C1
08
N/
S
C
107
N/
S
R4
9
N/
S
C1
06
100u
F
PGD
U1
IR
3846
Vref
17
RSo
11
BOOT
4
NC3
22
Vp
18
Vsns
8
RT
/S
y
nc
6
Enabl
e
5
OC
s
et
7
NC
1
2
RS+
16
PVi
n
1
Comp
10
PGND
12
LGN D
13
FB
9
VC
C
21
NC4
23
Vi
n
20
SW
24
S_C trl
14
RS-
15
NC
2
3
PGD
19
NC5
26
R1
15
0
C
105
10
0uF
+
C
125
N/
S
PVi
n
C7
3
22u
F
C7
0
0.
1
uF
BOD
E
2
JU
M
P
E
R
3
C7
2
22uF
C7
1
2
2uF
C7
6
22u
F
7
x 22u
F / 1
206 /
25V
/ Ce
ramic
Capa
citor
6
x 10
0uF /
1206
/ 6.
3V /
Cera
mic C
apaci
tor
3
30uF
/ 25
V / E
lectr
olyti
c Ca
pacit
or
+
C1
2
6
N/
S
BOOT
R1
7
4.
0
2
K
V
cc-
1
+
C1
27
N/
S
D2
N/
S
1
2
D1 N/
S
1 2
Vsns
R1
00
49
.9
K
+
C8
1
33
0uF
+
C
128
N/
S
R3
0
PVi
n
C
115
N/
S
C1
04
1
00uF
PG_PU
VCC
C
112
N/
S
C1
3
2200
pF
C7
4
2
2uF
Rt
/S
y
nc
R9 39.
2
K
C8
0
N/
S
C1
5
N/
S
+
C1
2
9
N/
S
R1
6
4.
0
2
K
C8 10u
F
C6 1u
F
Vi
n
A
gnd
1
C1
0
3
10
0uF
Vout
R
118
0
C1
0
2
100
uF
R1
17
N/
S
PG_PU
PG_Pul
lu
p
1
C1
01
10
0uF
Vo_
R
_P
R1
4
4.
02K
C7
1-
C8
0:
0
8
0
5
/ 12
06
pa
ds
R4
6-
R4
9:
1
2
0
6
pa
ds
C
1
0
0-C
12
4:
0
8
0
5
/ 12
06
p
a
d
s
C1
9
N/
S
R7
1
0
R4
7
0
VC
C
C1
09
N/
S
Vou
t-
123456
Vi
n
R4
6
0
V
cc+
1
FB
PGood
1
Vout
_Adj
1
C1
2
1
60pF
R4
N/
S
R4
0
N/
S
R4
1
N/
S
Vo_R
_
N
C4
0
N/
S
C1
1
0
N/
S
R1
1
1
10K
FB
C5 N/
S
C1
7
1
00pF
Vre
f
Vi
n 1
Vr
ef 1
Vi
n
C7
5
22uF
R1
8
0
C1
1
1
N/
S
VC
C
VC
C
C1
16
N/
S
Sy
nc
1
Enab
le
1
BOOT
R1
1
0
10K
C1
1
7
N/
S
C1
0
0.
1uF
Vp
C
118
N/
S
Vi
n+
123456
Vi
n-
123456
Vi
n 1
Vp
1
Vi
n
1
V
DDQ
1
C
100
N/
S
Vi
n 1