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IPS20 Datasheet(PDF) 4 Page - List of Unclassifed Manufacturers |
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IPS20 Datasheet(HTML) 4 Page - List of Unclassifed Manufacturers |
4 / 12 page Power Management IPS20 and IPS21 © Copyright 2006-2009 - ASIC Advantage, Inc. AADS00001/AA743 - Revision 5– Dec 2008 4 / 12 IN-PLUG® IPS20 and IPS21 FUNCTIONAL DESCRIPTION IPS20 and IPS21 are highly integrated feedback solutions for Switch Mode Power Supplies applications requiring constant voltage and constant current mode. They were especially designed to reduce the power dissipated in the load-side current sensing resistor of power supplies with high output current They provide precise voltage and current regulation that can be fully and independently adjusted. They source the current necessary to drive a ground- referred optocoupler connected to the line side controller. They both incorporate the same trimmed temperature compensated 1.2V reference to set the output voltage. They only differ by the characteristics of the current sensing references. The IPS20 features a trimmed 50mV reference with a positive temperature coefficient which closely matches that of a PCB copper trace. This copper trace sensing method can be used inexpensively with very low associated power losses. The IPS21 incorporates a constant 100mV reference for more conventional resistors. Both the output voltage and current sense can be independently adjusted through respectively RV1/RV2 and RISENSE (FIG.1) This information is presented to the IPS20/21 controller, which drives the optocoupler through the OPTO current-mode output pin. The shunt regulator operates like a zener diode, keeping the chip supply voltage at about 4 volts. At start-up, when the 4 volts are reached, the controller starts normal operation. The overall chip consumption in this case is about 600 μA. If the IPS20 or IPS21 Vcc is connected to the converter output voltage, then under start-up or short-circuit conditions, the IPS20/21 isn’t supplied with a high enough voltage. This is due to the fact that the chip has its power supply line in common with the power supply line of the system. Therefore, the current limitation can only be ensured by the primary PWM module, that should be chosen accordingly. If the primary current limitation is considered not to be precise enough for the application, then a sufficient supply for the IPS20/21 has to be ensured under any condition. It would then be necessary to add some circuitry to supply the chip with a separate power line. The schematic in Figure 3 below shows how to realize a low-cost power supply for the IPS20/21 (with no additional winding). Please pay attention to the fact that in the particular case presented here, this low-cost power supply can reach voltages as high as twice the voltage of the regulated line. FIG.2 OUTPUT VOLTAGE VERSUS OUTPUT CURRENT |
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