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NCP1654 Datasheet(PDF) 5 Page - ON Semiconductor |
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NCP1654 Datasheet(HTML) 5 Page - ON Semiconductor |
5 / 23 page NCP1654 http://onsemi.com 5 DETAILED PIN DESCRIPTIONS Pin Symbol Name Function 1 GND Ground − 2 Vin Multiplier Voltage This pin provides a voltage VM for the PFC duty cycle modulation. The input impedance of the PFC circuits is proportional to the resistor RM externally connected to this pin. The device op- erates in average current mode if an external capacitor CM is connected to the pin. Otherwise, it operates in peak current mode. 3 CS Current Sense Input This pin sources a current ICS which is proportional to the inductor current IL. The sense cur- rent ICS is for overcurrent protection (OCP), overpower limitation (OPL) and PFC duty cycle modulation. When ICS goes above 200 mA, OCP is activated and the Drive Output is disabled. 4 VBO Brown−Out / In Connect a resistor network among the rectified input voltage, BO pin, and ground. And connect a capacitor between BO pin and ground. BO pin detects a voltage signal proportional to the average input voltage. When VBO goes below VBOL, the circuit that detects too low input voltage conditions (brown− out), turns off the output driver and keeps it in low state until VBO exceeds VBOH. This signal which is proportional to the RMS input voltage Vac is also for overpower limitation (OPL) and PFC duty cycle modulation. 5 Vcontrol Control Voltage / Soft−Start The voltage of this pin Vcontrol directly controls the input impedance. This pin is connected to external type−2 compensation components to limit the Vcontrol bandwidth typically below 20 Hz to achieve near unity power factor. The device provides no output when Vcontrol < Vcontrol(min). When it starts operation, the power increases slowly (soft−start). 6 VFB Feed−Back / Shutdown This pin receives a feedback signal VFB that is proportional to the PFC circuits output voltage. This information is used for both the output regulation, the overvoltage protection (OVP), and output undervoltage protection (UVP) to protect the system from damage at feedback abnor- mal situation. When VFB goes above 105% VREF, OVP is activated and the Drive Output is disabled. When VFB goes below 8% VREF, the device enters a low−consumption shutdown mode. 7 VCC Supply Voltage This pin is the positive supply of the IC. The circuit typically starts to operate when VCC ex- ceeds 10.5 V and turns off when VCC goes below 9 V. After start−up, the operating range is 9 V up to 20 V. 8 DRV Drive Output The high current capability of the totem pole gate drive (±1.5 A) makes it suitable to effectively drive high gate charge power MOSFET. |
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