www.fairchildsemi.com
© 2009 Fairchild Semiconductor Corporation
4
AN-8026 / FEB301_FAN9611 / FAN9612 • Rev. 0.0.4
3.
Test Procedures
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
DD
for the control chip first. It should be higher than 13V
(refer to the
specification for V
DD
turn-on threshold voltage).
2.
When V
DD
is supplied, a "click" sound from the relay is heard. This is normal. Since
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
DD
higher than 13V.
3.
Connect the AC voltage (90~264V
AC
) to start the FAN9611 / FAN9612. Since
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 two-
channel interleaving operation for output power above around 110W.
Table 1.
Test Equipment
Test Model
FEB301-001
Test Date
Sept.7, 2009
Test Temperature
Ambient
Test Equipment
AC Source: Chroma 61603 AC POWER SOURCE
Electronic Load: Chroma 63108
Power Meter: WT210
Oscilloscope: Lecroy wavesurfer 24Xs
DC Source: ABM 9306D
Test Items
Startup
Normal Operation
Normal Operation
Line and Load Transient
Brown in/out Protection
Phase Management
Efficiency
Harmonic Distortion and Power Factor
