The following user guide supports the FAN9611 / FAN9612 400W evaluation board for
interleaved boundary-conduction mode power factor corrected supply. The user guide
should be used in conjunction with the FAN9611/FAN9611 / FAN9612 datasheet as well
as the Fairchild application note AN-6086 — Design Considerations for Interleaved
Boundary-Conduction Mode PFC Using FAN9611 / FAN9612. The user guide and the
evaluation board can also be used to evaluate FAN9611 controller which has the lower
turn-on threshold. Please visit Fairchild’s website at www.fairchildsemi.com
information.
1. Overview of the Evaluation Board
The FAN9611 / FAN9612 interleaved dual Boundary-Conduction-Mode (BCM) PowerFactor-Correction (PFC) controller operates two parallel-connected boost power trains
180º out of phase. Interleaving extends the maximum practical power level of the control
technique from about 300W to greater than 800W. Unlike the continuous conduction
mode (CCM) technique often used at higher power levels, BCM offers inherent zerocurrent switching of the boost diodes (no reverse-recovery losses), which permits the use
of less expensive diodes without sacrificing efficiency. Furthermore, the input and output
filters can be smaller due to ripple current cancellation between the power trains and
effectively doubling the switching frequency.
The advanced line feedforward with peak detection circuit minimizes the output voltage
variation during line transients. To guarantee stable operation with less switching loss at
light load, the maximum switching frequency is clamped at 600kHz. Synchronization is
maintained under all operating conditions.
for
Built-in protection functions include output over-voltage, over-current, open-feedback,
under-voltage lockout, brownout, and redundant latching over-voltage. The FAN9611 /
FAN9612 is available in a lead-free 16-lead SOIC package.
Fairchild offers and evaluation board to aide in design and test of applications using the
FAN9611 / FAN9612. The FAN9611 / FAN9612 evaluation board is a single-layer board
designed for 400W (400V/1A) rated power. Thanks to the phase management, the
efficiency is maintained above 95% at low-line and high-line, even down to 10% of the
rated output power. The efficiencies for full-load condition are 96.3% and 98.0% at line
voltages of 115V
and 230VAC, respectively.
AC
2. General Specification
Specification Min. Max. Units
Input
VIN AC Voltage 90 264 VAC
VIN AC Frequency 47 63 Hz
VDD Supply 13 16 VDC
Before testing the board; DC voltage supply for VDD, AC voltage supply for line input,
and DC electric load for output should be connected to the board properly.
1. Supply V
specification for V
2. When V
the inrush current limit relay is turned on by 5V reference (pin #3), the relay turns on
when FAN9611 / FAN9612 comes out of UVLO by supplying V
3. Connect the AC voltage (90~264V
FAN9611 / FAN9612 has brownout protection and line OVP, any input voltages out
of operation range trigger protections.
4. Change load current (0~1A) and check the operation. The board is designed to go
into phase shedding for output power below around 55W. It goes back to twochannel interleaving operation for output power above around 110W.
Table 1. Test Equipment
Test Model
Test Date
Test Temperature
Test Equipment
Test Items
for the control chip first. It should be higher than 13V (refer to the
DD
turn-on threshold voltage).
DD
is supplied, a "click" sound from the relay is heard. This is normal. Since
DD
FEB301-001
Sept.7, 2009
Ambient
AC Source: Chroma 61603 AC POWER SOURCE
Electronic Load: Chroma 63108
Power Meter: WT210
Oscilloscope: Lecroy wavesurfer 24Xs
DC Source: ABM 9306D
Startup
Normal Operation
Normal Operation
Line and Load Transient
Brown in/out Protection
Phase Management
Efficiency
Harmonic Distortion and Power Factor
2. Only 29V overshoot is observed (7.44% of nominal output voltage) for no-load startup and only 18V (4.62% of
normal output voltage) overshoot is observed for full-load startup.
Figure 9. 230V
50Hz No LoadFigure 10.230V
AC
50Hz Full Load
AC
Note:
3. Only 17V overshoot is observed (4.36% of nominal output voltage) for no-load startup and only 18V (4.62% of
normal output voltage) overshoot is observed for full-load startup.
Test Condition: Inductor current of 115VAC / 60Hz, 230VAC / 50Hz full load.
Figure 11. 115V
60Hz Full LoadFigure 12.115V
AC
60Hz Full Load
AC
Note:
4. Figure 11 and Figure 12 show the two inductor currents and the sum of two inductor currents at 115V
voltage and full-load conditions. The sum of the inductor currents has relativel y small ri pple due to the ripple
cancellation of interleaving operation.
Figure 13. 230V
50Hz Full LoadFigure 14.230V
AC
50Hz Full Load
AC
AC
line
Note:
5. Figure 13 and Figure 14 show the two inductor currents and the sum of two inductor currents at 230V
AC
line
voltage and full-load conditions. The sum of the inductor currents has relativel y small ri pple due to the ripple
cancellation of interleaving operation.
Test Condition: 115VAC to 230VAC full load transient and 230VAC load transient.
Figure 15. 230VAC to 115VAC Line TransientFigure 16.115VACto 230VAC Line Transient
Note:
6. Figure 15 and Figure 16 show the line transient operation and minimal effect on the output voltage due to the line
feed forward function. When the line voltage changes from 230VAC to 115VAC, 14.5V (3.72% of nominal output
voltage) voltage undershoot is observed. When the line voltage changes from 115V
voltage undershoot is observed.
to 230VAC, almost no
AC
Figure 17. 230V
Note:
7. Figure 17 and Figure 18 show the load-transient operation. When the output load chang es from 100% to 0%,
23.6V (6.1% of nominal output voltage) voltage overshoot is observed. When the output load changes from 0%
to 100%, 23.9V (6.13% of nominal output voltage) voltage undershoot is observed.
100% to 0% Line TransientFigure 18.230VAC0% to 100% Line Transient
12. Figure 27 and Figure 28 show the measured efficiency of the evaluation board at input voltages of
115V
and 230V, respectively. Since phase shedding reduces the switching loss by effectively
AC
decreasing the switching frequency at light-load, a greater efficiency im provement is achieved at
high line where switching losses are greater. Relatively less improvement is obtained for low line
since the MOSFET is turned on with zero voltage and switching losses are negligible.
Replace components on the Evaluation Board only with those parts shown on the parts list (or Bill of Materials) in the Users’ Guide. Contact an
authorized Fairchild representative with any questions.
This board is intended to be used by certified professionals, in a lab environment, following proper safety procedures. Use at your own risk. The
Evaluation board (or kit) is for demonstration purposes only and neither the Board nor this User’s Guide constitute a sales contract or create any kind
of warranty, whether express or implied, as to the applications or products involved. Fairchild warrantees that its products meet Fairchild’s published
specifications, but does not guarantee that its products work in any specific application. Fairchild reserves the right to make changes without notice to
any products described herein to improve reliability, function, or design. Either the applicable sales contract signed by Fairchild and Buyer or, if no
contract exists, Fairchild’s standard Terms and Conditions on the back of Fairchild invoices, govern the terms of sale of the products described herein.
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U.S. origin products and products made with U.S. origin technology are subject to U.S Re-export laws. In the event of re-export, the user will be