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NCP1602 Datasheet(PDF) 3 Page - ON Semiconductor |
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NCP1602 Datasheet(HTML) 3 Page - ON Semiconductor |
3 / 32 page NCP1602 www.onsemi.com 3 EMI Filter AC line LOAD L1 D1 Q1 Vin Vbulk IL Rsense Cbulk Cz Rz Cp Rcs1 Rcs2 Cin Rfb2 Rfb1 1 2 34 5 6 FB VCTRL CS / ZCD GND DRV VCC Rcszcd Figure 1. NCP1602 Application Schematic Table 4. DETAILED PIN DESCRIPTION Pin Number Name Function 1 VCTRL The error amplifier output is available on this pin. The network connected between this pin and ground adjusts the regulation loop bandwidth that is typically set below 20 Hz to achieve high Power Factor ratios. VCTRL pin is internally pulled down when the circuit is off so that when it starts operation, the power increases slowly to provide a soft−start function. VCTRL pin must not be controlled or pulled down externally. 2 GND Connect this pin to the PFC stage ground. 3 CS / ZCD This pin monitors the MOSFET current to limit its maximum current. This pin is the output of a resistor bridge connected between the drain and the source of the power MOSFET. Internal circuitry takes care of extracting Vin, Vout, Iind and ZCD 4 DRV The high−current capability of the totem pole gate drive (−0.5/+0.8A) makes it suitable to effectively drive high gate charge power MOSFETs. 5 VCC This pin is the positive supply of the IC. The circuit starts to operate when VCC exceeds 17.0 V ([**A] & [**B] Versions) or 10.5 V ([**C] & [**D] Versions) and turns off when VCC goes below 9.0 V (typical values). After start−up, the operating range is 9.5 V up to 30 V. 6 FB This pin receives a portion of the PFC output voltage for the regulation and the Dynamic Response Enhancer (DRE) that drastically speeds−up the loop response when the output voltage drops below 95.5% of the desired output level. FB pin voltage VFB is also the input signal for the (non−latching) Over−Voltage (OVP) and Under−Voltage (UVP) comparators. The UVP comparator prevents operation as long as FB pin voltage is lower than VUVPH internal voltage reference. A SOFTOVP comparator gradual- ly reduces the duty−ratio when FB pin voltage exceeds 105% of VREF. If the output voltage still increases, the driver is immediately disabled if the output voltage exceeds 107% of the desired level (fast OVP). A 250−nA sink current is built−in to trigger the UVP protection and disable the part if the feed- back pin is accidently open. |
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