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NCS5651 Datasheet(PDF) 10 Page - ON Semiconductor |
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NCS5651 Datasheet(HTML) 10 Page - ON Semiconductor |
10 / 11 page NCS5651 www.onsemi.com 10 Safe Operating Area The safe operating area (SOA) of an amplifier is the collection of output currents IL and the output voltages VL that will result in normal operation with risk of destruction due to overcurrent or overheating. In a normal application only the output amplifier of the line driver must be considered; the load on the small−signal amplifier is usually negligible. The output amplifier SOA depends on the thermal resistance from junction to ambient RqJA, which in turn strongly depends on board design. RqJA = 50 K/W in free air is a typical value, which may be used even if the host printed circuit board (PCB) is mounted in a small closed box, provided the transmission of frames are infrequent and widely spread in time. This typical value is also used in the generation of the curves plotted in Figures 14 and 15. Figure 14 shows the SOA in function of output current IL and output voltage VL with the ambient temperature as independent parameter. The maximum allowed current is 800 mA RMS. For that reason it is recommended to limit the output current by using RLIM = 5 k W. This current limitation is plotted as a horizontal line. The maximal output voltage is limited by VCC,max, VOH and VOL. This results in the straight line on the right hand side of the VL–IL plot. The area below and left from these limitations is considered as safe. The relation between output voltage and current is the impedance as seen at the output of the power operational amplifier. Constant impedance lines are represented by canted lines. Figure 14. Example SOA in VL–IL Space (bottom left corner is safe) with Rthj−a = 50 K/W Although voltage−versus−current is the normal representation of safe operating area, a PLC line driver can only control one of these variables: voltage and current are linked through the mains impedance. Figure 15 displays exactly the same information as Figure 14 but might be easier to work with. Constant current values are now represented as canted lines. Figure 15. Example SOA in ZL–VL Space (bottom right corner is safe) Again, the safe operating area depends on PCB layout. Thus, the designer must verify the performance of her particular design [1]. Digital Power Supply GND−Reference and Translators In many mixed signal applications analog GND and digital GND are not at the same potential. To minimize GND loop issues, the NCS5651 has a separate GND pin (pin 20) which should be used to reference the digital supply and the warning flags (pins 16, 17, and 18). In most applications this would be the same GND reference used for the PLC modem. Please note that at some point in the application digital GND and analog GND must be tied together. REFERENCES In this document references are made to: 1. ON Semiconductor, Design Manual NCN49597/9, December 2014. The latest version is available from your sales representative. 2. ON Semiconductor. AND8402/D Thermal Considerations for the NCS5651 (application note). 2014−08−01. Online at http://www.onsemi.com/pub/Collateral/AND8402 −D.PDF 3. ON Semiconductor. AND9165/D. Getting started with power line communication (application note). 2014−11−01. Online at http://www.onsemi.com/pub_link/Collateral/AND 9165−D.PDF |
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