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NC12S0A0V60PRFA Datasheet(PDF) 7 Page - Delta Electronics, Inc. |
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NC12S0A0V60PRFA Datasheet(HTML) 7 Page - Delta Electronics, Inc. |
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7 / 13 page  DS_NC12S60A_02072007 7 FEATURES DESCRIPTIONS Remote On/Off The remote ON/OFF input allows external circuitry to put the NC converter into a sleep mode. Active-high remote on/off is available as standard. Active-high units of the NC series are turned on if the remote ON/OFF pin is high (or floating). Pulling the pin low will turn off the unit. To guarantee turn-on the enable voltage must be above 2.4V and to turn off the enable voltage must be pulled below 0.8V The remote ON/OFF input can be driven in a variety of ways as shown in Figures 26, 27, and 28. If the remote ON/OFF signal originates on the primary side, the remote ON/OFF input can be driven through a discrete device (e.g. a bipolar signal transistor) or directly from a logic gate output. The output of the logic gate may be an open-collector (or open-drain) device. If the drive signal originates from the opposite of an isolated side, the remote ON/OFF input can be isolated and driven through an opto-coupler. Figure26: Remote ON/OFF Input Drive Circuit for Non-Isolated Bipolar Figure 27 : Remote ON/OFF Input Drive Circuit for Logic Driver DESIGN CONSIDERATIONS The NC60A is designed using three-phase synchronous buck topology. Block diagram of the converter is shown in Figure 25. The output can be trimmed in the range of 0.9V to 5.0V by a resistor from trim pin to ground. The remote sense is able to compensate for a drop from the output of converter to point of load. The converter can be turned on/off by remote control. Positive OUTEN logic implies that the converter DC output is enabled when this signal is driven high (greater than 2.4V) or floating and disabled when low (below 0.8V). Negative OUTEN logic is an option. The converter provides an open collector signal, Power Good. The power good signal is pulled low when output is not within ±10% of Vout or when Enable is off. The converter can protect itself into hiccup mode against over current and short circuit condition. Also, the converter will shut down due to over voltage protection is detected. The converter has an over temperature protection which can protect itself by shutting down for an over temperature event. There is a thermal hysteresis of typically 25℃ Safety Considerations It is recommended to add a fuse at input line. As to current rating of the fuse, it depends on the output voltage and current setting. o TRIM Vo GROUND o o o 5V o VIN GROUND OUTEN o TRIM Vo GROUND o o o o VIN GROUND OUTEN Figure 25: Block Diagram |
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