DC759A - Schematic

5
4
Vu1
Q4
BCX55
2
Isolation Boundary
R3
10
1
1
2
C1
0.1uF
50V
1
2
1
6
Fg
2
11
14
C4
0.1uF
6.3V
SS
4
Sync
PGND
13
5
SS/MaxDC
Delay
12
R11
13.3K
6
Vr=2.5V
OC
11
7
SD/Vsec
Isense
10
Blank
9
8
GND
R17
340K
+Vb
C14
100pF
R9
169K
R12
910
SS
2
D5
PMEG4005
1
C
6
D6
(Opt.)
D7
(Opt.)
R14
0.015
R13
47
Sout
R18
22.1K
C7
(Opt.)
T2
Q4470-B
COILCRAFT
C10
220pF
C17
100pF
R20
45.3K
**
D4
BAT760
C5
4700pF
R15
39K
R21
1.3M
1206
C3
Q7B
5
C11
0.47uF
16V
1
6
2
5
3
4
B
U3
PS2801-1
R24
0
Vfb
R10
1K
4
1
3
2
R30
1.2K
D8
PDZ7.5B
R16
4.7K
R22
270
5
R25
0
3
Vdd
2
Fg
16
3
Cg
-Sync
15
Pgnd
Vaux
14
4
GND
Icomp
13
5
Opto
+Isns
12
6
Vcomp
-Isns
11
7
Marg
PwrOK
10
8
Vfb=1.233V
C13
47pF
Q6
BC847BF
3
2
C16
0.1uF
X7R
Sync
R28
56K
R32
150K
OVP
C9
0.1uF
9
B
+Vo1
R27
38K
R31
12.4K
LINEAR TECHNOLOGY CORPORATION
Linear Technology Has Made A Best Effort To Design A
Circuit That Meets Customer-Supplied Specifications;
However, It Remains The Customer's Responsibility To
Verify Proper And Reliable Operation In The Actual
Application. Component Substitution And Printed
Circuit Board Layout May Significantly Affect Circuit
Performance Or Reliability. Contact Linear Technology
Applications Engineering For Assistance.
This Circuit Is Proprietary To Linear Technology And
Supplied For Use With Linear Technology Parts.
4
C8
1uF
16V
X5R
1
Vaux
Customer Notice
* To Enable Buffer Change R33 to 10 ohm
Fg
U2
LTC1698EGN
R23
1.5K
LTC CONFIDENTIAL - FOR CUSTOMER USE ONLY
** Install 0 ohm Resistor Instead
Cg
C12
15nF
C15
2200pF
250V
A
Vaux
Q5
BCX55
3
Sync
R19
560
Vu1
C6
0.22uF
25V
X7R
1
Out
CU1
10uF
16V
2
Rosc
R6
2.2
1
3
-Vout
TP6
Q1
PHM21NQ15T
4
Vin
R33
0
+5V at 20A
TP5
3
FB=1.23V
15
Comp
+
CO2
(Opt.)
1
R8
115K
16
3
C
*
Sout
2
C2
680pF
Q3
HAT2165H
TP3
CSYS
470uF
6.3V
POSCAP
2
U1
LT1952EGN
1
Q8
BC857BF
1
Vu1
5
2
R5
33K
Vu1
1
Sout
R7
22K
2
Vfb
Q7A
PBSS4140DPN
Q2
HAT2165H
T1
PA0491.003
2
TP4
Cg
D
TP2
CO1
100uF
6.3V
TDK
X5R
10
8
+Vin
D3
BZX384-C12
-Vin
+Vout
7
2
36V to 72V
D1
PDZ18B
R4
82K
3
CIN1
CIN2
2.2uF
100V
X7R
TDK
D
D2
BAS516
1
1
TP1
+Vo1
L1
1.5uH
CDEP147NP-1R5MC-95
1
R2
47K
1206
2
+Vin
1
1
+Vb
R1
0
2
2
+Vin
3
2
1630 McCARTHY BLVD.
MILPITAS, CA. 95035
408-432-1900
408-434-0507 FAX
Title
A
48Vin to 5Vout @ 20A Converter
Size
Document Number
Date:
Monday, November 15, 2004
DEMO 759A LT1952EGN, LTC1698EGN
Sheet
1
1
of
1
Rev
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