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NCP1027 Datasheet(PDF) 13 Page - ON Semiconductor |
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NCP1027 Datasheet(HTML) 13 Page - ON Semiconductor |
13 / 30 page NCP1027 www.onsemi.com 13 Fault Condition – Output Short−Circuit As soon as VCC reaches VCCON, drive pulses are internally enabled. If everything is correct, the auxiliary winding increases the voltage on the VCC pin as the output voltage rises. During the start−sequence, the controller smoothly ramps up the peak current to Imax setting, e.g. Ipeak_HI, which is reached after a typical period of 1.0 ms. As soon as the peak current setpoint reaches its maximum (during the startup period but also anytime an overload occurs), an internal error flag is asserted, Ipflag, indicating that the system has reached its maximum current limit set point (Ip = Ip max). The assertion of this flag triggers a 55 ms counter. If at counter completion Ipflag remains asserted, all driving pulses are stopped and the part stays off during eight periods of 55 ms (440 ms). A new attempt to restart occurs and will last 55 ms providing the fault is still present. If the fault still affects the output, a safe burst mode is entered, affected by a low duty−cycle operation (11%). When the fault disappears, the power supply quickly resumes operation. Figure 27 depicts this particular mode. Figure 27. In case of short−circuit or overload, the NCP1027 protects itself and the power supply via a low frequency burst mode. The VCC is maintained by the current source and self−supplies the controller. |
Similar Part No. - NCP1027_15 |
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Similar Description - NCP1027_15 |
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