ZHCSR78H July 2000 – November 2022 UCC28C40 , UCC28C41 , UCC28C42 , UCC28C43 , UCC28C44 , UCC28C45 , UCC38C40 , UCC38C41 , UCC38C42 , UCC38C43 , UCC38C44 , UCC38C45
PRODUCTION DATA
请参考 PDF 数据表获取器件具体的封装图。
With current mode control, slope compensation is required to stabilize the overall loop with duty cycles exceeding 50%. Although not required, slope compensation also improves stability in applications using below a 50% maximum duty cycle. Slope compensation is introduced by injecting a portion of the oscillator waveform to the actual sensed primary current. The two signals are summed together at the current sense input (CS) connection at the filter capacitor. To minimize loading on the oscillator, it is best to buffer the timing capacitor waveform with a small transistor whose collector is connected to the reference voltage.