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參數(shù)資料
| 型號： | NCP1200 |
| 廠商： | ON SEMICONDUCTOR |
| 英文描述： | PWM Current-Mode Controller for Low-Power Universal Off-Line Supplies |
| 中文描述： | PWM電流模式控制器的低功耗通用離線用品 |
| 文件頁數(shù)： | 14/16頁 |
| 文件大小： | 151K |
| 代理商： | NCP1200 |
NCP1200
http://onsemi.com
14
If the leakage inductance is kept low, the MTD1N60E can
withstand
accidental
avalanche energy, e.g. during a
highvoltage spike superimposed over the mains, without
the help of a clamping network. If this leakage path
permanently forces a drainsource voltage above the
MOSFET BVdss (600 V), a clamping network is mandatory
and must be built around Rclamp and Clamp. Dclamp shall
react extremely fast and can be a MUR160 type. To calculate
the component values, the following formulas will help you:
R
clamp =
2
V
clamp
L
leak
(V
clamp
(V
out
Fsw
Vf sec)
N)
Ip
2
C
clamp
V
clamp
Fsw
V
ripple
R
clamp
with:
V
clamp
: the desired clamping level, must be selected to be
between 40 V to 80 V above the reflected output voltage
when the supply is heavily loaded.
V
out
+ Vf
: the regulated output voltage level + the secondary
diode voltage drop
L
leak
: the primary leakage inductance
N
: the Ns:Np conversion ratio
F
SW
: the switching frequency
V
ripple
: the clamping ripple, could be around 20 V
Another option lies in implementing a snubber network
which will damp the leakage oscillations but also provide
more capacitance at the MOSFET’s turnoff. The peak
voltage at which the leakage forces the drain is calculated
by:
L
leak
C
lump
where C
lump
represents the total parasitic capacitance seen
at the MOSFET opening. Typical values for Rsnubber and
Csnubber in this 4W application could respectively be 1.5
k and 47 pF. Further tweaking is nevertheless necessary to
tune the dissipated power versus standby power.
V
max
Ip
Available Documents
“Implementing the NCP1200 in Lowcost ACDC
Converters”, AND8023/D.
“Conducted EMI Filter Design for the NCP1200’’,
AND8032/D.
“Ramp Compensation for the NCP1200’’, AND8029/D.
TRANSient and AC models available to download at:
http://onsemi.com/pub/NCP1200
NCP1200 design spreadsheet available to download at:
http://onsemi.com/pub/NCP1200
ORDERING INFORMATION
Device
NCP1200P40
Type
Marking
1200P40
Package
PDIP8
Shipping
50 Units / Rail
NCP1200P40G
F
SW
= 40 kHz
1200P40
PDIP8
(PbFree)
50 Units / Rail
NCP1200D40R2
200D4
SOIC8
2500 Units /Reel
NCP1200D40R2G
200D4
SOIC8
(PbFree)
2500 Units /Reel
NCP1200P60
1200P60
PDIP8
50 Units / Rail
NCP1200P60G
F
SW
= 60 kHz
1200P60
PDIP8
(PbFree)
50 Units / Rail
NCP1200D60R2
200D6
SOIC8
2500 Units /Reel
NCP1200D60R2G
200D6
SOIC8
(PbFree)
2500 Units /Reel
NCP1200P100
1200P100
PDIP8
50 Units / Rail
NCP1200P100G
F
SW
= 100 kHz
1200P100
PDIP8
(PbFree)
50 Units / Rail
NCP1200D100R2
200D1
SOIC8
2500 Units / Reel
NCP1200D100R2G
200D1
SOIC8
(PbFree)
2500 Units / Reel
For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging
Specifications Brochure, BRD8011/D.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| NCP1200D100R2 | PWM Current-Mode Controller for Low-Power Universal Off-Line Supplies |
| NCP1200D100R2G | PWM Current-Mode Controller for Low-Power Universal Off-Line Supplies |
| NCP1200D40R2 | PWM Current-Mode Controller for Low-Power Universal Off-Line Supplies |
| NCP1200P40 | PWM Current-Mode Controller for Low-Power Universal Off-Line Supplies |
| NCP1200P40G | PWM Current-Mode Controller for Low-Power Universal Off-Line Supplies |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| NCP1200/D | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:PWM Current-Mode Controller for Low-Power Universal Off-Line Supplies |
| NCP1200_06 | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:PWM Current−Mode Controller for Low−Power Universal Off−Line Supplies |
| NCP1200_09 | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:PWM Current-Mode Controller for Low-Power Universal Off-Line Supplies |
| NCP1200A | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:PWM Current-Mode Controller for Universal Off-Line Supplies Featuring Low Standby Power |
| NCP1200A/D | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:PWM Current-Mode Controller for Universal Off-Line Supplies Featuring Low Standby Power |
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