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NCP1239 Datasheet(PDF) 6 Page - ON Semiconductor |
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NCP1239 Datasheet(HTML) 6 Page - ON Semiconductor |
6 / 38 page NCP1239 http://onsemi.com 6 PIN FUNCTION DESCRIPTION Pin No. Pin Name Function Pin Description 1 GTS Shuts the PFC down in standby The standby detection block changes Pin 1 state in accordance to the mode (standby or normal mode). Pin1 is designed to drive an external pnp transistor that connects or disconnects the NCP1239’s VCC to the PFC’s. 2 REF5V A 5V reference voltage This pin helps to internally bias the controller but can also be used to power surrounding logic gates for any purposes. The typical output current is 10 mA. This voltage source is disabled during the circuit startup and latched−off phases. A 100 nF filtering capacitor must be placed between Pin 2 and ground. 3 Fault Detect Enables to permanently shutdown the part If the Pin 3 voltage exceeds 2.4 V, the circuit is permanently shut down. This pin can be used to monitor the voltage across a thermistor in order to protect the application from excessive heating and/or to detect an overvoltage condition. 4 Rt Timing resistor Pin 4 resistor allows a precise frequency programming. The circuit is optimized to operate between 50 kHz and 150 kHz (NCP1239F) and between 100 kHz and 250 kHz (NCP1239V). 5 Brown−Out Brown−Out This pin receives a portion of the bulk capacitor to authorize operation above a certain level of mains only. It also serves to elaborate an offset voltage on Pin 9 used for Over Power Compensation. 6 SS/Timer Performs soft−start and fault timeout During Power on and fault conditions, the capacitor connected to this pin ensures a soft−start period. When a fault is detected, this pin is internally brought high by a current source. If 4.3 V are reached, the fault is confirmed and the circuit enters an auto−recovery burst mode, otherwise the pin goes back to a lower value and oscillates to perform frequency jittering. 7 Skip Adjust Adjust skip level By adjusting the skip−cycle level, it is possible to fight against noisy transformers and modify the standby detection thresholds. Keep Pin 7 open to operate with the default levels (skip threshold setpoint: 140 mV, normal mode recovery setpoint: 250 mV). 8 FB Feedback signal An opto−coupler collector pulls this pin low to regulate 9 Over Power Limit (NCP1239F) Enables a precise peak current clamp and then an accurate Over Power Detection This pin delivers a current proportional to Vpin5, an image of the high voltage rail. Inserting a resistor between Pin 9 and the current sense resistor, an offset proportional to the input voltage is built. Such offset compensates the circuit and power switch propagation delays for an accurate power limitation in the whole input voltage range. 9 Max Duty− Cycle (NCP1239V) Enables to precisely clamp the maximum duty−cycle. This terminal sources a constant current. Connect a resistor between Pin 9 and Ground to select the maximum duty−cycle. 10 CS The current sense input This pin receives the primary current information via a sense element. By inserting a resistor in series with this pin, it becomes possible to introduce ramp compensation. 11 Ground The IC ground − 12 Drv Drives the MOSFET By offering up to +500 mA/−800 mA peak, this pin lets you drive large Qg MOSFET’s. It is clamped to 16 V maximum not to exceed the maximum gate−source voltage of most power MOSFET’s. 13 VCC Supplies the controller This pin accepts up to 36 V from an auxiliary winding. 14 NC − Creepage distance. 15 NC − Creepage distance. 16 HV The high−voltage startup This pin connects to the bulk capacitor to generate the startup current. |
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