AND8344/D
13
frequency for each half of the period. It is recommended to
keep power signals as short as possible in the PFC and the
STBY stages. This SMPS is designed on a single layer PCB
with several wire jumpers.
Results
To test efficiency and EMI please follow the steps detailed
in test procedure available on the ON Semiconductor web
site. The tests show that the demoboard meets all of the
requirements for a typical LCD TV. Additional
measurements are shown below for further information on
the operation of the design.
Thanks
ON Semiconductor thanks the companies:
Koshin −
Coilcraft −
for providing the samples used on this demoboard.
Conclusion
This demoboard shows only one of many possible
implementations of the NCP1392 resonant controller and is
not intended as final design for end customers. The main
goal of this document is to illustrate a typical application
where these controller would be used and illustrate some
functions that can be implemented with external
sub-circuits. Many options are included on the PCB, so it is
easy to update an application according to specific requests.
The following are are a series of scope plots that may be
helpful in understanding the operation of the SMPS under
different conditions.
References
[1] Data Sheet
[2] Data Sheet
[3] Data Sheet
[4] Application Note
[5] Application Note
[6] Application Note
[7] Application Note
[8] Bo Yang − Topology Investigation for Front-End
DC−DC Power Conversion for Distributed Power
System
[9] M. B. Borage, S. R. Tiwari and S. Kotaiah − Design
Optimization for an LCL − Type Series Resonant
Converter
Figure 16. Detail of the drain current and
voltage of the STBY SMPS for 20 W load and
nominal V
bulk
. An 800 V MOSFET is used. The
max drain voltage for this figure is 600 V, so
the transistor is safe.
Figure 17. STBY primary current and drain
voltage for 20 W load, nominal V
bulk
. SMPS
operates at 60 kHz.
Summary of Contents for NCP1351B
Page 19: ...AND8344 D www onsemi com 19 Figure 47 Schematic of the SMPS...
Page 20: ...AND8344 D www onsemi com 20 Figure 48 Bottom Side of the PCB...
Page 21: ...AND8344 D www onsemi com 21 Figure 49 Bottom Labels...
Page 22: ...AND8344 D www onsemi com 22 Figure 50 Top Labels...
Page 24: ...AND8344 D www onsemi com 24 Figure 52 Photo of the Demoboard with Heatsinks Removed...
Page 25: ...AND8344 D www onsemi com 25 Figure 53 Photo of the Demoboard Bottom Side...
Page 26: ...AND8344 D www onsemi com 26...
Page 27: ...AND8344 D www onsemi com 27...
