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NCP1230D65R2G Datasheet(PDF) 11 Page - ON Semiconductor |
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NCP1230D65R2G Datasheet(HTML) 11 Page - ON Semiconductor |
11 / 21 page NCP1230 www.onsemi.com 11 OPERATING DESCRIPTION Introduction The NCP1230 is a current mode controller which provides a high level of integration by providing all the required control logic, protection, and a PWM Drive Output into a single chip which is ideal for low cost, medium to high power off−line application, such as notebook adapters, battery chargers, set−boxes, TV, and computer monitors. The NCP1230 can be connected directly to a high voltage source providing lossless startup, and eliminating external startup circuitry. In addition, the NCP1230 has a PFC_VCC output pin which provides the bias supply power for a Power Factor Correction controller, or other logic. The NCP1230 has an event management scheme which disables the PFC_VCC output during standby, and overload conditions. PFC_VCC As shown on the internal NCP1230 diagram, an internal low impedance switch SW1 routes Pin 6 (VCC) to Pin 1 when the power supply is operating under nominal load conditions. The PFC_VCC signal is capable of delivering up to 35 mA of continuous current for a PFC Controller, or other logic. Connecting the NCP1230 PFC_VCC output to a PFC Controller chip is very straight forward, refer to the “Typical Application Example” all that is generally required is a small decoupling capacitor (0.1 mF). Figure 29. Typical Application Example 1 8 2 3 4 7 6 5 High Voltage MC33262/33260 1 8 2 3 4 7 6 5 NCP1230 + GND Vout Rsense GND VCC Cap PFC_VCC |
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