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PT4529 Datasheet(PDF) 4 Page - Texas Instruments |
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PT4529 Datasheet(HTML) 4 Page - Texas Instruments |
4 / 10 page For technical support and more information, see inside back cover or visit www.ti.com Application Notes PT4500/PT4520 Series Operating Features and System Considerations for the PT4500/PT4520 DC/DC Converters Output Current Limit The PT4500 and PT4520 series of DC/DC converters incorporate an output current limit. This protects both the module and upstream source against load faults. Applying a load, in excess of the current limit threshold, will sim- ply cause the output voltage to drop. The output current remains limited, but continues to flow in the fault. The drop in output voltage will vary according to the severity of the fault. Applying a short circuit to the output will result in an output voltage of zero, and the fault current will be limited to a value slightly higher than the current limit threshold. Upon the removal of the load fault, the output voltage of the module will fully recover to its normal regulated output voltage. Primary-Secondary Isolation The PT4500 and PT4520 series of DC/DC converters incorporate electrical isolation between the input termi- nals (primary) and the output terminals (secondary). All converters are production tested to a withstand voltage of 1500VDC. The isolation complies with UL60950 and EN60950, and the requirements for operational isolation. This allows the converter to be configured for either a positive or negative input voltage source. Output Voltage Adjustment The output voltage is typcially adjustable over a range of ±10% of nominal. Consult the separate application note, “Ajusting the Output Voltage of the PT4500/PT4520 Series of Isolated DC/DC Converters.” Remote On/Off Function The output voltage from the converter can be turned off from the primary side using the Remote On/Off control (pin 1). Consult the separate application note, “Using the Remote On/Off Function on the PT4500/PT4520 Series of Isolated DC/DC Converters.” Under-Voltage Lock-Out The Under-Voltage Lock-Out (UVLO) circuit prevents operation of the converter whenever the input voltage to the module is insufficient to maintain output regulation. Below the UVLO threshold the module is off and the Remote On/Off control (pin 1) is inoperative. Table 1-2 gives the applicable UVLO thresholds. Table 1-2; UVLO Thresholds Series UVLO Threshold Vin Range PT4520 31V Typical 36 – 75V PT4500 16.5V Typical 18 – 40V Turn-On Time The typical turn-on time is typically 35 milliseconds at Vin =48V. This is from application of input power, or the removal of a low-voltage signal from the Remote On/Off (pin 1). This includes about about 5–10ms of delay time before the output voltage begins to rise. Turn-on time will vary slightly with input voltage, output load, and the total amount of capacitance connected to the output. Input Current Limiting The converter is not internally fused. For safety and overall system protection, the maximum input current to the converter must be limited. Active or passive current limiting can be used. Passive current limiting can be a fast acting fuse. A 125-V fuse, rated no more than 5A, is recommended. Active current limiting can be imple- mented with a current limited “Hot-Swap” controller. Thermal Considerations Airflow may be necessary to ensure that the module can supply the desired load current in environments with elevated ambient temperatures. The required airflow rate may be determined from the Safe Operating Area (SOA) thermal derating curves. These are provided in the “Typical Characteristics” section of the converter specifications. |
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