Linear Technology 1317A-D Quick Start Manual page 6

Vu1
U1
R13 R14
LT1952-1
22K 33K
1
Vfb Comp
2
Q12
FB=1.23V
BC856T
R15
169k
3
Rosc
4
Sync
C13
5
.47u MaxDC
C10 6
Vr=2.5V
0.1u
R22
7
SD
13.3k
8
GND
R29*
PMEG3002
R2
+Vb +Vr2
560k
QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 1317A-D
ACTIVE RESET ISOLATED 18-72V INPUT TO 24V @5A DC/DC POWER CONVERTER
+Vin +Vb
R1
+Vin
2.2R
Q10
PBSS8110
18V to 72V
Cin
R11
3x2.2uF
+Vr2
82k
-Vin
R5
U2
10R
LTC4440-5
1 6
C3
Vcc Boost
1u
2 5
GND TG
C21
3 4
470p Inp TS
Rcs1
Out
0.006R
R3
R53
287
200R
D1
D17
BAS516
BAS516
16
Sout
Vu1
15
Vin
D10* C8
Cu1
14
100p 100p
4.7u
Out
13
PGND
C9 R20
12
Delay
75k
100p
11
OC
R23 1.5k
10
Isense C11
3.3n
9
Blank
R24
47k
NOTE:
This schematic shows only the components required for operation of -D version
of DC1317A demo board.
All optional components of DC1317A demo board have been removed.
Also, all zero-ohm resistors have been replaced with wires.
Please consult the full DC1317A-D schematic to decide if any of the optional
components should be included in your design.
Vu1
1
D2
L2
D5
1.5mH BAS516
PDZ10B
D3
6
T1
G45R2-0408.004
2, 3
+Vin
4, 5
R54
Q1 4.7R
HAT2173
C34
0.22u
+Vo1
Q13
Si2325
R45
10k D6
B0540
C33
0.1u
D14
BAS516
Vu1
BAS516
R9
R26
47R
U6
220R
PS2801-1
Vfb
C23
R30
1uF
1.2k
C15
2.2nF, 2kV
HR-PQA2050-27
7, 8
10, 11
Q2 Q3
HAT2173 RJK2055
FG CG
R8
2.2R
L3*
BAS521
D7*
330p
R16
221K
C6*
U5
BAS521
R18
LTC3900
10k
1
C5 CS+
0.22u
R21
2
CS-
10k
3
Q9 CG CG
BCX55
4
Vcc
R10 D9
R19 56k
PDZ10B
4.7k
C14
10u
D11
U4
LT4430
1
Vcc
2
GND
3
C19 SS
1uF
Figure 7. Demo board DC1317A-D schematic
* Please change the ref designator to reflect the symbol.
6
+Vo1
+Vout
L1
24V @5A
+
GND
Out
C7
220p
L4
10uH
R17
560R
8
Sync
7
Timer
6
GND
5
FG
T2A
FG
PE-68386
C12
470p
R27
C17
470R
15n
R34
6
Opto 13.7k
5
R35
Comp
+Vo1
237k
4
FB
R38
6.04k