AN1344 STMicroelectronics, AN1344 Datasheet - Page 3

• Manufacturer Part Number: AN1344
• Description: VIPOWER: 108W POWER SUPPLY USING VIPER100A
• Manufacturer: STMicroelectronics

AN1344 - APPLICATION NOTE
Figure 2: Electrical schematic
3. TRANSFORMER SPECIFICATION
3.1 TRANSFORMER CONSTRUCTION
The transformer is wound with a split primary to reduce leakage inductance and minimize the snubbing
needed. The auxiliary winding is placed on the outside to achieve the coupling needed for the current
limiting function.
3/10
J1
CON
Primary inductance
Primary leakage inductance
Core
Inductance rating (Al Factor)
Note
1
2
3
1
3
2
F2
Thermistor
FUSE
2.5A
5X20mm
R1
33
C1
.1uF
X CAP
1
2
2 X 6mH
L1
3
4
C17
4
.1uF
X CAP
BR1
1
2
600V 2A
BRIDGE
Close for 120Vac
1
SW SPST
3
SW1
2
R14
470k
R12
470k
C20
330uf
200V
C2
BZW50-180
330uF
200V
D5
180uF
16V
C5
R5
4.22K
1%
C6
4.7nF
50V
525uH
7.9 uH
ETD34
329 nH/T
Split Primary - Gapped Core
R8
10
2
D2
1N4148
C15
.1uF
50V
600V
2
D1
1
R3
200
2W
STTA106
ST
R4
8.2
1
1
2
3
4
5
R00
0 ohms
OSC
VDD
DRAIN
SOURCE
COMP
C4 100pF
D4
NU
1KV
HS
6
U1
VIPer100A
5
4
2
3
.
.
.
.
Cramer Coil
R0
0
C7
22nF
50V
E34351E
TX1
2.2nF
Y1 cap
C14
C8
1uF
50V
R6
6.2K
.
.
22
9
7
R13
4
3
.5W
STPS20H100C
T
D3
1
2
3
2
.001uf 1KV
C16
TL431
U2
1
R7
220
H11A817A
U3
C9
1800uF
25V
R9
1k
C12
.1uF
50V
R10
3.16K
1%
18 V @ 6A
L4
10uH
C10
1800uF
25V
R11
20K
1%
C11
470uF
25V
CON2
2
1
J2