Datasheet

Loop Compensation
g =96 Sm
m
(41)
H= » 0.015=
V
REF
V
OUT
6V
390V
(42)
R =
Z
=6.313k 6.34k» WW=
100mV
V H g
RIPPLE m
´ ´
100mV
11V 0.015 96 Sm´ ´
(43)
C =
Z
=2.67 Fm=
1
f
LINE
5
2p ´ ´ R
Z
1
47Hz
5
2p ´ ´ W6.34k
(44)
C =
P
=1.12nF=
1
f
MIN
2
2p ´ ´ R
Z
1
45kHz
2
2p ´ ´ W6.34k
(45)
C =2.2 Fm
Z
(46)
C =1nF
P
(47)
ADDITIONAL REFERENCES
Related Parts
References
Package Outline and Recommended PCB Footprint
UCC28061
www.ti.com .............................................................................................................................................................. SLUS837A – JUNE 2008 – REVISED JULY 2009
Resistor R
Z
is sized to attenuate low-frequency ripple to less than 2% of the voltage amplifier output range. This
value ensures good power factor and low input current harmonic distortion.
The transconductance amplifier gain is shown in Equation 41 :
The voltage divider feedback gain is shown in Equation 42 and Equation 43 :
C
Z
is then set to add 45 ° of phase margin at 1/5th of the switching frequency, as shown in Equation 44 :
C
P
is sized to attenuate high-frequency noise, as shown in Equation 45 :
The standard values of Equation 46 and Equation 47 should be chosen for C
Z
and C
P
.
Table 3 lists several TI parts that have characteristics similar to the UCC28061.
Table 3. Related Parts
DEVICE DESCRIPTION
UCC28051 PFC controller for low to medium power applications
UCC28019 8-pin continuous conduction mode (CCM) PFC controller
UCC28060 Natural Interleaving™ Dual-Phase Transition-Mode PFC Controller
These references, design tools, and links to additional references, including design software, may be found at
www.power.ti.com :
• Evaluation Module, UCC28060EVM 300W interleaved PFC Pre-regulator, SLUU280 from Texas Instruments
• Application Note, UCC38050 100-W Critical Conduction Power Factor Corrected (PFC) Pre-regulator,
SLUU138 from Texas Instruments
The mechanical packages at the end of this data sheet outline the mechanical dimensions of the 16-pin D
(SOIC) package and provide recommendations for PCB layout.
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Product Folder Link(s): UCC28061