参数资料
型号: NCP1200P60G
厂商: ON Semiconductor
文件页数: 14/16页
文件大小: 0K
描述: IC CTLR PWM CM 8DIP
标准包装: 50
输出隔离: 隔离
频率范围: 52kHz ~ 70kHz
输入电压: 11 V ~ 16 V
工作温度: -25°C ~ 125°C
封装/外壳: 8-DIP(0.300",7.62mm)
供应商设备封装: 8-PDIP
包装: 管件
其它名称: NCP1200P60GOS
NCP1200
If the leakage inductance is kept low, the MTD1N60E can
withstand accidental avalanche energy, e.g. during a
high ? voltage spike superimposed over the mains, without
the help of a clamping network. If this leakage path
permanently forces a drain ? source voltage above the
MOSFET BVdss (600 V), a clamping network is mandatory
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 turn ? off. The peak
voltage at which the leakage forces the drain is calculated
by:
leak
lump
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:
V max + Ip @
L
C
out ) Vf sec) @ N)
clamp
clamp
leak
clamp
clamp
V
@ Fsw @ R
R clamp =
2 @ V @ (V * (V
L @ Ip 2 @ Fsw
V
C +
ripple 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
ORDERING INFORMATION
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 W and 47 pF. Further tweaking is nevertheless necessary to
tune the dissipated power versus standby power.
Available Documents
“Implementing the NCP1200 in Low ? cost AC ? DC
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
Device
NCP1200P40G
NCP1200D40R2G
Type
F SW = 40 kHz
Marking
1200P40
200D4
Package
PDIP ? 8
(Pb ? Free)
SOIC ? 8
Shipping ?
50 Units / Rail
2500 / Tape & Reel
(Pb ? Free)
NCP1200P60G
1200P60
PDIP ? 8
50 Units / Rail
NCP1200D60R2G
F SW = 60 kHz
200D6
(Pb ? Free)
SOIC ? 8
2500 / Tape & Reel
(Pb ? Free)
NCP1200P100G
1200P100
PDIP ? 8
50 Units / Rail
NCP1200D100R2G
F SW = 100 kHz
200D1
(Pb ? Free)
SOIC ? 8
2500 / Tape & Reel
(Pb ? Free)
?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.
http://onsemi.com
14
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