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NCP1015AP065G Datasheet(PDF) 7 Page - ON Semiconductor |
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NCP1015AP065G Datasheet(HTML) 7 Page - ON Semiconductor |
7 / 22 page NCP1015 http://onsemi.com 7 APPLICATION INFORMATION Introduction The NCP1015 offers a complete current−mode control solution (actually an enhanced NCP1200 controller section) together with a high−voltage power MOSFET in a monolithic structure. The component integrates everything needed to build a rugged and low−cost Switch−Mode Power Supply (SMPS) featuring low standby power. The quick selection table details the differences in operating frequency. • No need for an auxiliary winding: ON Semiconductor Very High Voltage Integrated Circuit technology lets you supply the IC directly from the high−voltage dc rail. We call it Dynamic Self−Supply (DSS). This solution simplifies the transformer design and ensures a better control of the SMPS in difficult output conditions, e.g. constant current operations. However, for improved standby performance, an auxiliary winding can be connected to the VCC pin to disable the DSS operation. • Short−circuit protection: by permanently monitoring the feedback line activity, the IC is able to detect the presence short−circuit, immediately reducing the output power for a total system protection. Once the short has disappeared, the controller resumes and goes back to normal operation. • Low standby−power: If SMPS naturally exhibit a good efficiency at nominal load, they begin to be less efficient when the output power demand diminishes. By skipping un−needed switching cycles, the NCP1015 drastically reduces the power wasted during light load conditions. An auxiliary winding can further help decreasing the standby power to extremely low levels by invalidating the DSS operation. Typical measurements show results below 80 mW @ 230 Vac for a typical 7 W universal power supply. • No acoustic noise while operating: Instead of skipping cycles at high peak currents, the NCP1015 waits until the peak current demand falls below a fixed 0.25 of the maximum limit. As a result, cycle skipping can take place without having a singing transformer. You can thus select cheap magnetic components free of noise problems. • SPICE model: a dedicated model to run transient cycle−by−cycle simulations is available but also an averaged version to help you closing the loop. Ready−to−use templates can be downloaded in OrCAD’s PSpice, and INTUSOFT’s IsSpice4 from ON Semiconductor web site, NCP1015 related section. Dynamic Self−Supply When the power supply is first powered from the mains outlet, the internal current source (typically 8 mA) is biased and charges up the VCC capacitor from the drain pin. Once the voltage on this VCC capacitor reaches the VCC(off) level (typically 8.5 V), the current source turns off and pulses are delivered by the output stage: the circuit is awake and activates the power MOSFET. Figure 12 details the internal circuitry: Figure 12. The Current Source Regulates VCC by Introducing a Ripple Vref OFF = 8.5 V Vref ON = 7.5 V VrefLatch = 4.7 V - + Internal Supply + Vref VCC(off) +200 mV (8.7 V Typ.) VCC + CVCC Startup Source Drain Being loaded by the circuit consumption, the voltage on the VCC capacitor goes down. When the DSS controller detects that VCC has reached 7.5 V (VCC(on)), it activates the internal current source to bring VCC toward 8.5 V and stops again: a cycle takes place whose low frequency depends on the VCC capacitor and the IC consumption. A 1 V ripple takes place on the VCC pin whose average value equals (VCC(off) + VCC(on)) / 2. Figure 13 shows a typical operation of the DSS. |
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