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Devices for SW Power Supply
■ Switching Power Supply Types & Recommended Power MOSFETs Map
Universal AC Input
20
Forward (1 or 2 used)
V DSS : 600 to 800V
14
Flyback
RCC or PWM
8
V DSS : 600 to 800V
6
Output Power/P OUT [W]
30
50
100
150
200
■ Application Example
ACIN
PFC FRD
PFC
Control
PFC
MOSFET
(1) Flyback
For low-output use (up to 150W)
few externally-conneted parts required
1 MOSFET is used for switching
(2) Forward
Usable for middle-large ouput (100 to 300W)
Several switching MOSFETs can be used in parallel
Several switching MOSFETs can be used
(3) Half-Bridge
For middle output (<150 to 400W)
MOSFET with a lower voltage than flyback or
Forward voltage can be used
2 switching MOSFETs are used
(4) Full-Bridge
For high output (>300 to 400W)
MOSFET with a lower voltage than flyback or
forward voltage can be used
4 switching MOSFETs are used
Full-bridge (4 used)
V DSS : 450 to 500V
Half-bridge (2 used)
When output becomes large, a high V DSS
V DSS : 450 to 500V
is required for the device
ex) Flyback Circuit
Output 80W → V DSS ≥600V
Output 120W → V DSS ≥700V
250
300
350
400
450
500
(1) Flyback Circuit
SBD
V CC
DC
Output
Main SW
MOSFET
Main Control
SBD
(2) Forward Circuit
V CC
DC
Output
SBD
Main SW
MOSFET
Main Control
V CC
(3) Half-Bridge Circuit
Pulse IN
SBD/FRD
Main SW
MOSFET
Main SW
SBD/FRD
MOSFET
V CC
(4) Full-Bridge Circuit
SBD
SBD
Main SW
MOSFET
14
■ Switching Devices
[MOSFET/FRD/SBD Use Example]
ACIN
(1) Power MOSFET/SBD/FRD for Adapter
Recommended Devices
Applications/Power
Game machine
50W
Notebook PC
65W
General-purpose
75 to 90W
(2) Power MOSFET/SBD/FRD for other power supply
Recommended Devices [Other sets]
Set
Printer
BL DVD recorder
DVD recorder
Desktop PC
PDP TV
DC
Output
DC
Output
FRD
PFC
Control
PFC
MOSFET
Main SW
MOSFET
Set Spec
PFC
V OUT
I OUT
MOSFET
[V]
[A]
5
2.0 to 4.0
-
12
1.0 to 2.0
20
2.0 to 4.0
-
5
2.0 to 4.0
2SK4085LS
12
500V/0.33Ω
3.0 to 5.0
24
Set Specifi cation
PFC
Power
Specifi cation
FRD
[W]
Domestic (Japan)
50
-
W/W
50
-
Domestic (Japan)
100
❈ RD0506LS
Domestic (Japan)
60
-
W/W
>200
❈ RD1006LS
W/W
>300
❈ RD1006LS
15
SBD
DC
Output
SBD
Main SW
Rectifi er
MOSFET
SBD
SBT80-04J
2SK4086LS
(600V/0.58Ω)
SBT100-16JS
2SK4087LS
SBT100-16JS
(600V/0.47Ω)
SBT80-04J
2SK4087LS
SBT150-10JS
(600V/0.47Ω)
SBT100-16JS
❈: Development
Main SW
Rectifi er
MOSFET
MOSFET
SBD
-
2SK4096LS
SBT150-10JS
-
2SK4098LS
SBT150-10JS
2SK4097LS
2SK4087LS
SBT100-16JS
-
2SK4097LS
SBT80-06J
2SK4085LS
2SK4125
SBT350-04J
2SK4124
2SK4124
SBT100-16JS
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