9015 Datasheet, PDF (5/7 Pages) List of Unclassifed Manufacturers – QUAD NOR GATE

H1
2
1
Fuse
Vin=220VAC _C1
RECT
1 ^RT1 2
L1
C3
C2
R1
C5 _{R2 R4 R5 C6}
T1 1
2
D5
H2
Earth
Ground
C4
R3
2
1
R6
OP1
R10
R7 R8
R9 C9
C10
D1
D2
1
22
1
C7 C8 ^L2
D3
1
2
D8
IC1
8
7
2
6
1
3
45
C11
1 ^R11 2
2
1
D4
1
2
R12
Q1
1
R13 ZD1 ^R14
L3
1
2
+12V
C12 ^C13 R15
C14
C15 D7
IC2
2
12
1
1
23
-12V
D6
L4
1
2
1
2
+5V
C16
C17
R18
R16 2
OP1
1 ^R17 2
R19
C18
IC3
R20
Figure 3. Circuit Diagram of a Forward Converter
As output load increases gradually, the MOSFET conduction time automatically increases
from 33% at half load to 38% at full load under the action of a closed-loop regulator circuit,
which maintains an essentially constant output voltage.
V_ds
V_g
I_d
V_ds
V_gs
I_d
(a) Half Load Condition
V_ds(max)=510V, I_d(max)=1.3A, Duty=33%,
f=100KHz
(b) Full load condition
V_ds(max)=600V, I_d(max)=2.4A, Duty=38%,
f=100KHz
Figure 4. Waveforms of Drain Voltage and Current During Turn-on, 220VAC Line Input
5
Rev. B, July 2000