Datasheet
UCC28710, UCC28711
UCC28712, UCC28713
UCC28714, UCC28715
www.ti.com
SLUSB86 –NOVEMBER 2012
Voltage Terms in Volts
• V
BLK
: highest bulk capacitor voltage for stand-by power measurement.
• V
BULK(min)
: minimum voltage on C
B1
and C
B2
at full power.
• V
OCBC
: target cable compensation voltage at the output terminals.
• V
CBC(max)
: maximum voltage at the CBC pin at the maximum converter output current (see ELECTRICAL
CHARACTERISTICS).
• V
CCR
: constant-current regulating voltage (see ELECTRICAL CHARACTERISTICS).
• V
CST(max)
: CS pin maximum current-sense threshold (see ELECTRICAL CHARACTERISTICS).
• V
CST(min)
: CS pin minimum current-sense threshold (see ELECTRICAL CHARACTERISTICS).
• V
DD(off)
: UVLO turn-off voltage (see ELECTRICAL CHARACTERISTICS).
• V
DD(on)
: UVLO turn-on voltage (see ELECTRICAL CHARACTERISTICS).
• V
OΔ
: output voltage drop allowed during the load-step transient.
• V
DSPK
: peak MOSFET drain-to-source voltage at high line.
• V
F
: secondary rectifier forward voltage drop at near-zero current.
• V
FA
: auxiliary rectifier forward voltage drop.
• V
LK
: estimated leakage inductance energy reset voltage.
• V
OCV
: regulated output voltage of the converter.
• V
OCC
: target lowest converter output voltage in constant-current regulation.
• V
REV
: peak reverse voltage on the secondary rectifier.
• V
RIPPLE
: output peak-to-peak ripple voltage at full-load.
• V
VSR
: CV regulating level at the VS input (see ELECTRICAL CHARACTERISTICS).
AC Voltage Terms in V
RMS
• V
IN(max)
: maximum input voltage to the converter.
• V
IN(min)
: minimum input voltage to the converter.
• V
IN(run)
: converter input start-up (run) voltage.
Efficiency Terms
• η
SB
: estimated efficiency of the converter at no-load condition, not including start-up resistance or bias losses.
For a 5-V USB charger application, 60% to 65% is a good initial estimate.
• η: converter overall efficiency.
• η
XFMR
: transformer primary-to-secondary power transfer efficiency.
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