Rainbow Electronics MAX5953D - Manual (Page 19)

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