Rainbow Electronics MAX5953D - Manual (Page 24)

MAX5953A/MAX5953B/MAX5953C/MAX5953D
IEEE 802.3af PD Interface and PWM Controllers
with Integrated Power MOSFETs
24 ______________________________________________________________________________________
Typical Operating Circuit
PGOOD
V+ UVLO
R1*
R3
(R
DISC
)
25.5k
Ω
C1
68nF
D1
60V
-48V
RT
N
-48V
R2* R
RCLASS
4 6 8
RCLASS
18
DCUVLO
37
HVIN 39
DRNH
PPWM
BST
33, 34
21
36
XFRMRH
31, 32
XFRMRL
28, 29
INBIAS
40
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
23
PGND
PGND
E
U2
FOD2712
C
LED
FB
GND
COMP
20
CS
26, 27
SRC
OUT SGND
MAX5953A
U1
*R1 AND R2 ARE OPTIONAL AND WHEN USED, THEY MUST TOT
AL 25.5k
Ω
AND REPLACE R3, 25.5k
Ω
.