UCC28740
SLUSBF3A –JULY 2013–REVISED JULY 2013
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Current Terms in Amperes
IOCC The converter output constant-current target.
IPP(max) The maximum transformer primary peak current.
ISTART The startup bias-supply current (see ELECTRICAL CHARACTERISTICS).
ITRAN The required positive load-step current.
IVSL(run) The VS-pin run current (see ELECTRICAL CHARACTERISTICS).
Current and Voltage Scaling Terms
KAM The maximum-to-minimum peak primary current ratio (see ELECTRICAL CHARACTERISTICS).
KLC The current-scaling constant for line compensation(see ELECTRICAL CHARACTERISTICS).
Transformer Terms
LP
The transformer primary inductance.
NAS The transformer auxiliary-to-secondary turns-ratio.
NPA The transformer primary-to-auxiliary turns-ratio.
NPS The transformer primary-to-secondary turns-ratio.
Power Terms in Watts
PIN
The converter maximum input power.
POUT The full-load output power of the converter.
PSB The total standby power.
Resistance Terms in Ohms
RCS The primary peak-current programming resistance.
RESR The total ESR of the output capacitor(s).
RPL The preload resistance on the output of the converter.
RS1 The high-side VS-pin sense resistance.
RS2 The low-side VS-pin sense resistance.
Timing Terms in Seconds
tD
The total current-sense delay including MOSFET-turnoff delay; add 50 ns to MOSFET delay.
tDM(min) The minimum secondary rectifier conduction time.
tON(min) The minimum MOSFET on time.
tR
The resonant frequency during the DCM dead time.
tRESP The maximum response time of the voltage-regulation control-loop to the maximum required load-step.
Voltage Terms in Volts
VBLK The highest bulk-capacitor voltage for standby power measurement.
VBULK(min) The minimum valley voltage on CB1 and CB2 at full power.
VCCR The constant-current regulation factor (see ELECTRICAL CHARACTERISTICS).
VCST(max) The CS-pin maximum current-sense threshold (see ELECTRICAL CHARACTERISTICS).
VCST(min) The CS-pin minimum current-sense threshold (see ELECTRICAL CHARACTERISTICS).
VVDD(off) The UVLO turnoff voltage (see ELECTRICAL CHARACTERISTICS).
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