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UC2875L Datasheet(PDF) 11 Page - Texas Instruments |
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UC2875L Datasheet(HTML) 11 Page - Texas Instruments |
11 / 19 page 11 UC1875/6/7/8 UC2875/6/7/8 UC3875/6/7/8 APPLICATIONS INFORMATION (cont.) Slope/Ramp Pins The ramp generator may be configured for the following control methods: • Voltage Mode • Voltage Feedforward • Current Mode • Current Mode with Slope Compensation The figure below shows a voltage-mode configuration. With RSLOPE tied to a stable voltage source, the wave- form on CRAMP will be a constant-slope ramp, providing conventional voltage-mode control. If RSLOPE is con- nected to the power supply input voltage, a vari- able-slope ramp will provide voltage feedforward. For current-mode control the ramp generator may be disabled by grounding the slope pin and using the ramp pin as a direct current sense input to the PWM comparator. Voltage Mode Operation 1. Simple voltage mode operation achieved by placing RSLOPE between VIN and SLOPE. 2. Voltage Feedforward achieved by plac- ing RSLOPE between supply voltage and SLOPE pin of UC1875. RAMP dV dT V RC R s lope SLOPE R AMP ≈ • UDG-95086 If you should have questions or need additional information, please contact Jody Bustamante at (903) 868-6132 or j-busta@ti.com. CONTACT INFORMATION |
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