UCC28083, UCC28084, UCC28085, UCC28086

UCC38083, UCC38084, UCC38085, UCC38086

SLUS488E − SEPTEMBER 2002 − REVISED JULY 2009

9

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APPLICATION INFORMATION

operational waveforms

Figure 3 illustrates how the voltage ramp is effectively added to the voltage across the current sense element

UDG−01085

OUTA

OUTB

VRS

ADDED

RAMP

VOLTAGE

VCS, Pin 3

Figure 3. Typical Slope Compensation Waveforms at 80% Duty Cycle

In Figure 3, OUTA and OUTB are shown at a duty cycle of 80%, with the associated voltage VRS across the

current sense resistor of the primary push-pull power MOSFETs. The current flowing out of CS generates the

is also recommended to filter the waveform at CS.