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PDF AND8209 Data sheet ( Hoja de datos )
| Número de pieza | AND8209 | |
| Descripción | Notebook Adaptor | |
| Fabricantes | ON Semiconductor | |
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AND8209/D
90 W, Single Stage,
Notebook Adaptor
Prepared by: Terry Allinder
ON Semiconductor
Sr. Applications Engineer
http://onsemi.com
APPLICATION NOTE
General Description
The 90 W demo board demonstrates the wide range of
features found in the NCP1651. It provides an 18.5 V, 4.86 A
isolated output, foldback current limit which is ideal for
low−cost battery charger and notebook adaptor applications.
This unit will provide an isolated 18.5 V output from an
input source with a frequency range from 47 Hz to 63 Hz,
and a voltage range of 90 Vrms to 265 Vrms. It is fully
self−contained and includes an internal high voltage startup
circuit, and bias supply that operates of f of the Flyback
transformer auxiliary winding.
In addition to excellent power factor, this chip offers fixed
frequency operation in continuous and discontinuous modes
of operation. It has a wide variety of protection features,
including instantaneous current limiting, average current
limiting, and an accurate secondary side power limit.
Features
• Fixed Frequency Operation
• Operation Over the Universal Input Range
• Multiple Protection Schemes
• Single Power Stage with Isolated Output
• Startup and Bias Circuits Included
Table 1. Demonstration Board Specifications
Requirements
Symbol
Min
Max
Input
Vac 90 265
Frequency
Hz 47 63
Vo (Static Regulation)
Vdc
18.4
18.6
Io Adc 0 4.86
Output Power
W − 90
Efficiency
% 84 −
Standby Power
Vin 230 Vac
mW − 500
Detailed Circuit Description
The detailed operational description and design equations
are contained in the NCP1651 data sheet and in application
note AND8124/D. This application note relates to this
18.5 Vdc 90 W adaptor design.
The 18.5 Vdc 90 W adaptor was designed using the
Excel Design Spreadsheet which can be downloaded from
the ON Semiconductor website (www.onsemi.com). The
design steps for the adaptor are listed below. The schematic
for the 90 W demo board, Figure 7, is located at the end of
the technical write up.
Design Steps
1. Specifications, refer to Table 1 (90−265 V,
18.5 Vout, 90 W).
2. Determine primary inductance.
3. Determine turns ratio.
4. Select the MOSFET.
5. Select the output rectifier.
6. Build transformer with the lowest leakage
inductance.
7. Select the output capacitor for ripple and transient
response.
8. Complete control circuit design.
9. Build and test!
Figure 1 shows a sample of the System Input parameters
from the NCP1651 Design Excel Spreadsheet. In the
“Limits” column you enter your System Requirements.
Below this is a column labeled “Evaluation”. This is where
you would like to evaluate your design. Normally this is
done at full load and with the minimum input AC line
voltage. To the right you have the spreadsheet plot with the
average input current with respect to phase angle.
© Semiconductor Components Industries, LLC, 2005
May, 2005 − Rev. 0
1
Publication Order Number:
AND8209/D
http://www.Datasheet4U.com
1 page  
100
80
60
40
20
0
−20
−40
−60
0.01
Open Loop Gain
High Line
Low Line
0.1 1 10 100
FREQUENCY (Hz)
Figure 5. Loop Gain
AND8209/D
1000
−75
−90
−105
−120
−135
−150
−165
−180
0.01
Loop Phase
0.1 1 10 100
FREQUENCY (Hz)
Figure 6. Phase Margin
1000
http://onsemi.com
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