Figure 3. typical application circuit – Rainbow Electronics MAX5953D User Manual
Page 13
MAX5953A/MAX5953B/MAX5953C/MAX5953D
IEEE 802.3af PD Interface and PWM Controllers
with Integrated Power MOSFETs
______________________________________________________________________________________
13
PGOOD
V+
UVLO
R1*
OPEN
R3
(R
DISC
)
25.5k
Ω
C2
22
µ
F
63V
R5
200k
Ω
C3
220pF
C4
4.7
µ
F
C5
6800pF
R6
24.9k
Ω
R7
1.78k
Ω
*R1 AND R2 ARE OPTIONAL AND WHEN USED, THEY MUST TOT
AL 25.5k
Ω
AND REPLACE R3, 25.5k
Ω
.
C1
68nF
D1
60V
-48V
RT
N
-48V
R2*
OPEN
R4
(R
RCLASS
)
255
Ω
4
6
8
RCLASS
18
DCUVLO
37
R16
316k
Ω
R17
14.7k
Ω
HVIN
39
DRNH
PPWM
BST
C11
0.1
µ
F
D2
D3
C12A
47
µ
F
33, 34
21
36
XFRMRH
31, 32
XFRMRL
28, 29
INBIAS
40
R13
15
Ω
D6
V
EE
10
RCFF
44
RAMP
45
DRVIN
30
GA
TE
9
OUT
16
REGOUT
FL
TINT
43
42
24
RT
C
T
CSS
22
GND
25
OPTO
41
C6
0.1
µ
F
C7
100pF
R9
1M
Ω
C8
0.1
µ
F
23
PGND
PGND
E
U2
FOD2712
C
LED
FB
GND
COMP
20
CS
26, 27
SRC
C9
220pF
R10
100
Ω
R11
0.1
Ω
R8
OPEN
C10
0.33
µ
F
R12
604
Ω
R16
562
Ω
C16
0.15
µ
F
C17
0.047
µ
F
R15
16.2k
Ω
R14
143k
Ω
D4
22T
25T
11T
C15
1µ
F
C12B
47
µ
F
C13
0.1
µ
F
OUT
SGND
C14
0.0047
µ
F
MAX5953A
Figure 3. Typical Application Circuit