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| UCC28704 Datasheet, PDF (26/44 Pages) Texas Instruments – High-Efficiency Off-Line CV | |||
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UCC28704
SLUSCA8A â FEBRUARY 2016 â REVISED FEBRUARY 2016
www.ti.com
Typical Application (continued)
8.2.1 Design Requirements
The following table illustrates a typical subset of high-level design requirements for a particular converter of
which many of the parameter values are used in the various design equations in this section. Many other
necessary design parameters, such as fSW(MAX) and VBULK(min) for example, may not be listed in such a table.
These values may be selected based on design experience or other considerations, and may be iterated to
obtain optimal results.
Table 1. UCC28704 Design Parameters
PARAMETER
TEST CONDITIONS
INPUT CHARACTERISTICS
VIN
AC-line input voltage
fLINE
Line frequency
PSTBY
No-load input power
VIN = typ, IO = 0A
OUTPUT CHARACTERISTICS (MEASUREMENT AT 150-m⦠CABLE-END)
VO
VRIPPLE
IOR
IOCC
VCCUV
ηAVG
DC output voltage
Output voltage ripple
Output rated current
Output constant current
CC UV shutdown interception
Average efficiency
VIN = typ, IO = 0 to IOR
VIN = typ, IO = IOR
VIN = min to max
VIN = typ, IO > IOR
2.7V < VO < 5V
VIN= typ, IO = IOCC
VIN= typ, average of 25%, 50%,
75%, and 100% Load
η10
Light-load efficiency
SYSTEMS CHARACTERISTICS
VIN= typ, 10% load
fsw
TON-Delay
Switching frequency
Power-on delay time
VIN = min
IO= IOR (constant resistor load)
MIN
85
47
4.75
2.1
80%
75%
1
TYP
115/230
50/60
43
5
2.0
2.2
2.7
MAX UNIT
265 VRMS
63
Hz
50 mW
5.25
V
80 mV
A
2.3
A
V
65 kHz
1.8
s
26
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