SGLS121D December 2002 – June 2020 UCC2800-Q1 , UCC2801-Q1 , UCC2802-Q1 , UCC2803-Q1 , UCC2804-Q1 , UCC2805-Q1
PRODUCTION DATA.
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Slope compensation can be added in all current mode control applications to cancel the peak to average current error. Slope compensation is necessary with applications with duty cycles exceeding 50%, but also improves performance in those below 50%. Primary current is sensed using resistor Rcs in series with the converter switch. The timing resistor can be broken up into two series resistors to bias up the NPN follower. This is required to provide ample compliance for slope compensation at the beginning of a switching cycle, especially with continuous current converters. A NPN voltage follower drives the slope compensating programming resistor (Rsc) to provide a slope compensating current into CF.