JAJS131H July 2000 – November 2022 UCC28C40 , UCC28C41 , UCC28C42 , UCC28C43 , UCC28C44 , UCC28C45 , UCC38C40 , UCC38C41 , UCC38C42 , UCC38C43 , UCC38C44 , UCC38C45
PRODUCTION DATA
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The internal oscillator uses a timing capacitor (CCT) and a timing resistor (RRT) to program the oscillator frequency and maximum duty cycle. The operating frequency can be programmed based the curves in Figure 7-1, where the timing resistor can be found once the timing capacitor is selected. It is best for the timing capacitor to have a flat temperature coefficient, typical of most COG or NPO type capacitors. For this converter, 15.4 kΩ and 1000 pF were selected for RRT and CCT to operate at 110-kHz switching.