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NCP1203D60R2 Datasheet(PDF) 7 Page - ON Semiconductor |
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NCP1203D60R2 Datasheet(HTML) 7 Page - ON Semiconductor |
7 / 15 page NCP1203 http://onsemi.com 7 APPLICATION INFORMATION Introduction The NCP1203 implements a standard current mode architecture where the switch−off time is dictated by the peak current setpoint. This component represents the ideal candidate where low part−count is the key parameter, particularly in low−cost AC−DC adapters, auxiliary supplies etc. Due to its high−performance SMARTMOS High−Voltage technology, the NCP1203 incorporates all the necessary components normally needed in UC384X based supplies: timing components, feedback devices, low−pass filter and startup device. This later point emphasizes the fact that ON Semiconductor’s NCP1203 does not need an external startup resistance but supplies the startup current directly from the high−voltage rail. On the other hand, more and more applications are requiring low no−load standby power, e.g. for AC−DC adapters, VCRs etc. UC384X series have a lot of difficulty to reduce the switching losses at low power levels. NCP1203 elegantly solves this problem by skipping unwanted switching cycles at a user−adjustable power level. By ensuring that skip cycles take place at low peak current, the device ensures quiet, noise free operation. Finally, an auto−recovery output short−circuit protection (OCP) prevents from any lethal thermal runaway in overload conditions. Startup Sequence When the power supply is first powered from the mains outlet, the internal current source (typically 6.0 mA) is biased and charges up the VCC capacitor. When the voltage on this VCC capacitor reaches the VCC(on) level (typically 12.8 V), the current source turns off and no longer wastes any power. At this time, the VCC capacitor only supplies the controller and the auxiliary supply is supposed to take over before VCC collapses below VCC(min). Figure 13 shows the internal arrangement of this structure: Figure 13. The Current Source Brings VCC Above 12.8 V and then Turns Off − + 8 6 4 6 mA or 0 CVCC Aux HV 12.8 V/4.9 V Once the power supply has started, the VCC shall be constrained below 16 V, which is the maximum rating on pin 6. Figure 14 portrays a typical startup sequence with a VCC regulated at 12.5 V: Figure 14. A Typical Startup Sequence for the NCP1203 t, TIME (sec) 3.00 M 8.00 M 13.0 M 18.0 M 23.0 M 13.5 12.5 11.5 10.5 9.5 REGULATION 12.8 V |
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