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UCC28085 Datasheet(PDF) 9 Page - Texas Instruments |
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UCC28085 Datasheet(HTML) 9 Page - Texas Instruments |
9 / 19 page UCC28083, UCC28084, UCC28085, UCC28086 UCC38083, UCC38084, UCC38085, UCC38086 SLUS488B − SEPTEMBER 2002 − REVISED MAY 2003 9 www.ti.com APPLICATION INFORMATION operational waveforms Figure 3 illustrates how the voltage ramp is effectively added to the voltage across the current sense element VCS, to implement slope compensation. 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 ramp voltage across the filter resistor RF that is positioned between the power current sense resistor and the CS pin. This voltage is effectively added to VRS to provide slope compensation at VCS, pin 3. A capacitor CF is also recommended to filter the waveform at CS. |
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