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Pin No. 1 Pin Name PFC VCC Function Directly powers the PFC front−end stage Pin Description This pin is a direct connection to the VCC pin (Pin 6) via a low impedance switch. In standby and during the startup sequence, the switch is open and the PFC VCC is shutdown. As soon as the aux. winding is stabilized, Pin 1 connects to the VCC pin and provides bias to.
offered by the NCP1231 is an event management scheme that can disable the front−end PFC circuit during standby, thus reducing the no load power consumption. The NCP1231 itself goes into cycle skipping at light loads while limiting peak current (to 25% of nominal peak) so that no acoustic noise is generated and while in the skip cycle mode. The NCP1231 also features an internal latching function that can be used for Overvoltage Protection (OVP). The latch is triggered when the voltage on Pin 8 rises above 4.0 V. During an OVP condition, the output drive pulses are immediately stopped and the NC.
| No. | Partie # | Fabricant | Description | Fiche Technique |
|---|---|---|---|---|
| 1 | NCP1230 |
ON Semiconductor |
Low Standby Power High Performance PWM Controller |
|
| 2 | NCP1230A |
ON Semiconductor |
Low-Standby Power Soft Skip Mode Controller |
|
| 3 | NCP1232 |
ON |
Microprocessor Monitor |
|
| 4 | NCP1234 |
ON Semiconductor |
Fixed Frequency Current Mode Controller |
|
| 5 | NCP1235 |
ON Semiconductor |
Fixed Frequency Current Mode Controller |
|
| 6 | NCP1236 |
ON Semiconductor |
Fixed Frequency Controller |
|
| 7 | NCP1237 |
ON Semiconductor |
Fixed Frequency Current Mode Controller |
|
| 8 | NCP1238 |
ON Semiconductor |
Fixed-Frequency Controller |
|
| 9 | NCP1239 |
ON Semiconductor |
Fixed Frequency Current-Mode Controller |
|
| 10 | NCP120 |
ON Semiconductor |
Very Low Dropout Bias Rail CMOS Voltage Regulator |
|
| 11 | NCP1200 |
ON Semiconductor |
PWM Current-Mode Controller |
|
| 12 | NCP1200A |
ON Semiconductor |
PWM Current-Mode Controller |
|