www.fairchildsemi.com
FEB388_002
FAN9611/FAN9612 400W Interleaved
Dual BCM PFC Controller
Evaluation Board User Guide
Featured Fairchild Product: FAN9611, FAN9612
Please contact a local Fairchild Sales representative
for an evaluation board.
© 2010 Fairchild Semiconductor Corporation
1
FEB388_FAN9611/12 • Rev. 0.0.2
www.fairchildsemi.com
Table of Contents
1.
Overview of the Evaluation Board ............................................................................................. 3
2.
Key Features ............................................................................................................................... 4
3.
Specifications .............................................................................................................................. 5
4.
Test Procedure ............................................................................................................................ 6
5.
Schematic .................................................................................................................................... 7
6.
Boost Inductor Specification....................................................................................................... 8
7.
Line Filter Inductor Specifications ............................................................................................. 9
8.
PCB Layout ............................................................................................................................... 10
9.
Bill of Materials (BOM) ........................................................................................................... 14
10.
Test Results ....................................................................................................................... 16
10.1.
Startup ..................................................................................................................... 16
10.2.
Normal Operation ................................................................................................... 18
10.3.
Line Transient ......................................................................................................... 20
10.4.
Load Transient ........................................................................................................ 21
10.5.
Brownout Protection ............................................................................................... 22
10.6.
Phase Management ................................................................................................. 24
10.7.
Efficiency ................................................................................................................ 27
10.8.
Harmonic Distortion and Power Factor .................................................................. 28
11.
References ......................................................................................................................... 30
12.
Ordering Information ........................................................................................................ 30
13.
Revision History ............................................................................................................... 30
© 2010 Fairchild Semiconductor Corporation
2
FEB279_FAN9611/12 • Rev. 0.0.2
www.fairchildsemi.com
The following user guide supports the FAN9611/12 400W evaluation board for
interleaved boundary-conduction-mode power-factor-corrected supply. It should be used
in conjunction with the FAN9611/12 datasheet as well as the Fairchild application note
AN-6086 Design Considerations for Interleaved Boundary-Conduction Mode PFC using
FAN9612.
Although marked FAN9612, the evaluation board can be interchangeably used
to evaluate either the FAN9611 (10V turn-on threshold) or FAN9612 controller (12.5V
turn-on threshold). Please visit Fairchild’s website at
www.fairchildsemi.com
for
additional information.
1. Overview of the Evaluation Board
The FAN9611/12 interleaved dual Boundary-Conduction-Mode (BCM) Power-Factor-
Correction (PFC) controllers operate 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 zero-
current 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
doubling of effective 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 525kHz. Synchronization is
maintained under all operating conditions.
Protection functions include output over-voltage, over-current, open-feedback, under-
voltage lockout, brownout, and redundant latching over-voltage protection. The
FAN9611/12 is available in a lead-free 16-lead SOIC package.
This FAN9611/12 evaluation board is a four-layer board designed for 400W (400V/1A)
rated power. Thanks to the phase management, the efficiency is maintained above 96%
at low-line and high-line, even down to 10% of the rated output power. Efficiency is
96.4% at line voltage 115V
AC
and 98.2% at 230V
AC
under full-load conditions.
© 2010 Fairchild Semiconductor Corporation
3
FEB279_FAN9611/12 • Rev. 0.0.2
www.fairchildsemi.com
2. Key Features
Low Total Harmonic Distortion, High Power Factor
180° Out-of-Phase Synchronization
Automatic Phase Disable at Light Load
1.8A Sink, 1.0A Source, High-Current Gate Drivers
Transconductance (g
M
) Error Amplifier for Reduced Overshoot
Voltage-Mode Control with (V
IN
)
2
Feed-forward
Closed-Loop Soft-Start with Programmable Soft-Start Time for Reduced Overshoot
Minimum Restart Timer Frequency to Avoid Audible Noise
Maximum Switching Frequency Clamp
Brownout Protection with Soft Recovery
Non-Latching OVP on FB Pin and Second-Level Latching Protection on OVP Pin
Open-Feedback Protection
Over-Current and Power-Limit Protection for Each Phase
Low Startup Current: 80µA Typical
Works with DC, 50Hz to 400Hz AC Inputs
Figure 1.
Block Diagram
© 2010 Fairchild Semiconductor Corporation
4
FEB279_FAN9611/12 • Rev. 0.0.2
www.fairchildsemi.com
3. Specifications
This board has been designed and optimized for the following conditions:
Input Voltage Range
V
IN
Nominal : 85~264V
AC
V
DD
Supply : 13V
DC
~18V
DC
Rated Output Power
400W
Output Voltage
(Rated Current)
400V-1A
Note:
1. Minimum output voltage during the 20ms hold-up time is 330V
DC
.
V
LINE
= 85~264V
AC
V
OUT
= 400V
f
SW
> 50kHz
Efficiency > 96% down to 20% load (115V
AC
)
Efficiency > 97% down to 20% load (230V
AC
)
PF > 0.99 at full load
The trip points for the built-in protections are set as below in the evaluation board.
The non-latching output OVP trip point is set at 108% of the nominal output voltage.
The latching output OVP trip point is set at 117% of the nominal output voltage.
The line UVLO (brownout protection) trip point is set at 68V
AC
(10V
AC
hysteresis).
The pulse-by-pulse current limit for each MOSFET is set at 9.1A.
The maximum power limit is set at ~120% of the rated output power. The phase
management function permits phase shedding/adding ~15% of the nominal output power
for high line (230V
AC
). This level can be programmed by modifying MOT resistor (R6).
© 2010 Fairchild Semiconductor Corporation
5
FEB279_FAN9611/12 • Rev. 0.0.2
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