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