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NC12S0A0V40PRFA Datasheet(PDF) 7 Page - Delta Electronics, Inc. |
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NC12S0A0V40PRFA Datasheet(HTML) 7 Page - Delta Electronics, Inc. |
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7 / 14 page  DS_NC12S40A_05282008 7 FEATURES DESCRIPTIONS ENABLE (On/Off) The ENABLE (on/off) input allows external circuitry to put the NC converter into a low power dissipation (sleep) mode. Positive (active-high) ENABLE is available as standard. Positive ENABLE (active-high) units of the NC series are turned on if the ENABLE pin is high or floating. Pulling the pin low will turn off the unit. With the active high function, the output is guaranteed to turn on if the ENABLE pin is driven above 2.4V. The output will turn off if the ENABLE pin voltage is pulled below .8V. The ENABLE input can be driven in a variety of ways as shown in Figures 26, 27 and 28. If the ENABLE signal comes from the primary side of the circuit, the ENABLE can be driven through either a bipolar signal transistor (Figure 26) or a logic gate (Figure 27). If the enable signal comes from the secondary side, then an opto-coupler or other isolation devices must be used to bring the signal across the voltage isolation (please see Figure 28). NC30/NC40 Vout Ground Trim Enable Ground Vin Figure 26: Enable Input drive circuit for NC series NC30/NC40 Vout Ground Trim Enable Ground Vin 5V Figure 27: Enable input drive circuit using logic gate. NC30/NC40 Vout Ground Trim Enable Ground Vin Figure 28 : Enable input drive circuit example with isolation. DESIGN CONSIDERATIONS The NC40 is designed using two-phase synchronous buck topology. Block diagram of the converter is shown in Figure 25. The output can be trimmed in the range of 0.9Vdc to 5.0Vdc by a resistor from trim pin to ground. A remote sense function is provided and it 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 on/off (ENABLE pin) logic implies that the converter DC output is enabled when this signal is driven high (greater than 2.4V) or floating and disabled when the signal is driven low (below 0.8V). Negative on/off logic is optional and could also be ordered. The converter provides an open collector signal called Power Good. The power good signal is pulled low when output is not within ±10% of Vout or Enable is OFF. The converter can protect itself by entering hiccup mode against over current and short circuit condition. Also, the converter will shut down when an 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 30℃ Figure 25: Block Diagram Safety Considerations It is recommended that the user to provide two 12A very fast-acting type fuses (Little fuse R451 012) in parallel in the input line for safety. |
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