User Manual

MAX5953A/MAX5953B/MAX5953C/MAX5953D
IEEE 802.3af PD Interface and PWM Controllers
with Integrated Power MOSFETs
______________________________________________________________________________________ 19
PGOOD
V+ UVLO
R1* OPEN
R3
(R
DISC
)
25.5kΩ
C10
22µF
63V
R5 210kΩ
C2
100pF
C3
2.2µF
C4
4700pF
R7
25.5kΩ
R11
2kΩ
*R1 AND R2 ARE OPTIONAL AND WHEN USED, THEY MUST TOTAL 25.5kΩ AND REPLACE R3, 25.5kΩ.
C1
0.068µF
D1
56.7V
-48V
RTN
-48V
INBIAS
R2* 0Ω
R4
(R
CL
)
255Ω
4 6 8
RCLASS
18
DCUVLO
37
R16
316kΩ
R17
14.7kΩ
HVIN
39
DRNH
PPWM
PPWM
BST
C9 0.22µF
D11
T1
D3
D2
D10
R6
100Ω
C24
0.1µF
R28 10kΩ
-48V
OUT
T2
PA0264
PPWM
G1
D12
R16
1kΩ
R17
22Ω
G2
N4
33, 34
21
36
XFRMRH
31, 32
XFRMRL
28, 29
INBIAS
40
D6
V
EE
10
RCFF
44
RAMP
45
DRVIN
30
GATE
9
OUT
16
REGOUT
FLTINT
43
42 24
RTCT
CSS
22
GND
25
OPTO
41
C5
1000pF
C6 100pF
R8 1MΩ
C7 0.01µF
23
PGND
E
3 2
8
7 6
5
U2
FOD2712
C
LED
FB
GND
COMP
20
CS
26, 27
SRC
C8
100pF
R9
1kΩ
R10 0.18Ω
C13
0.22µF
R14
470Ω
R22 221Ω
C19
0.068µF
C20
0.068µF
C21 0.1µF
R21 2.52kΩ R20 2.74kΩ
C12 0.1µF
V
OUT1
(10V AT 30mA)
MAX5953A
U1
R6 210kΩ
GATE
-48V
OUT
R15
210kΩ
R25
OPEN
N.C.
1, 4
R24 1kΩ
R23
1MΩ
D8
D5
V
OUT2
C22 220µF
C23 220µF
A1
D7
V
OUT3
A2
INBIAS
C11 0.1µF
N3
A2
V
OUT2
RTN
D4
R18
22Ω
R19 1kΩ
G1
N2
N1
A1
-48V
OUT
V
OUT3
V
OUT2
(5.1V AT 1.8A)
V
OUT3
(2.55V AT 5.4A)
C17A
100µF
C16
100pF
C14 0.47µF
C17 220µF
C18 2200pF
C15 22µF
C25
0.1µF
A1
D9
R27 10kΩ
G2
C26
0.1µF
A2
Figure 6. PD with Three-Output Flyback DC-DC Converter