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MC7773N6 bảng dữ liệu(PDF) 7 Page - Cystech Electonics Corp. |
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MC7773N6 bảng dữ liệu(HTML) 7 Page - Cystech Electonics Corp. |
7 / 11 page CYStech Electronics Corp. Spec. No. : C151N6 Issued Date : 2012.11.08 Revised Date : Page No. : 7/11 MC7773N6 CYStek Product Specification Built-in Slope Compensation and Frequency Shuffling While MC7773N6 works in CCM mode, slope compensation and frequency shuffling is activated. The sensed voltage across the sense resistor is used for pwm control, and pulse by pulse current limit, Built-in slope compensation circuit adds a voltage ramp onto the current sense input voltage. This greatly improves the close loop stability and prevents the sub-harmonic oscillation of peak current mode pwm control scheme. To improve the EMI performance, the frequency of CCM mode is shuffling to 65kHz ± 4%. Line Slope Compensation Adjusting the RSENSE can set the Max output power of the power supple mode. The current flowing by the power MOSFET has an extra value due to the system delay T that the current detected from the sense pin to power MOSFET cut off in the MC7773N6. To guarantee the output power is a constant for universal input AC voltage, there is a positive ramp signal to compensate the system delay T and the line input. At lower line-input voltage the higher OCP threshold will bring constant power OCP as below. Leading Edge Blanking Each time when the power MOSFET is switched on, a turn-on spike will inevitably occur on the sense-resistor. To avoid premature termination of the switching pulse, a 300 nsec leading-edge blanking time is built in. Conventional RC filtering can therefore be omitted. During this blanking period, the current-limit comparator is disabled and it cannot switch off the gate driver. Gate Driver The output stage of MC7773N6 is a fast totem pole gate driver. Cross conduction has been avoided to minimize heat dissipation, increases efficiency and enhances reliability. The output driver is clamped by an internal 18V Zener diode in order to protect power MOSFET transistors against undesirable gate over voltage. A soft driving waveform is implemented to minimize EMI. |
Số phần tương tự - MC7773N6 |
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Mô tả tương tự - MC7773N6 |
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