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AN-1713 データシート(PDF) 2 Page - Texas Instruments |
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AN-1713 データシート(HTML) 2 Page - Texas Instruments |
2 / 12 page ![]() Powering and Loading Considerations www.ti.com 2 Powering and Loading Considerations Read this entire section prior to attempting to power the evaluation board. 2.1 Quick Setup Procedure Step 1: Set the power supply current limit to 10A. Turn off the power supply. Connect the power supply to the V IN terminals. Step 2: Connect the load, with a 5A capability, to the V OUT terminals. The positive connection goes to P3 and negative connection to P4. Step 3: The EN pin should be left open for normal operation. Step 4: Set V IN to 48V with no load applied. VOUT should be in regulation with a nominal 12V output. Step 5: Slowly increase the load while monitoring the output voltage, V OUT should remain in regulation with a nominal 12V output as the load is increased up to 5 Amps. Step 6: Slowly sweep the input voltage from 15V to 80V, V OUT should remain in regulation with a nominal 12V output. Step 7: Temporarily short the EN pin to GND to check the shutdown function. Step 8: Increase the load beyond the normal range to check current limiting. Hiccup mode current limit is used for protection. The peak short circuit current is limited to approximately 11A. Cooling is critical during this step. 2.2 Air Flow Prolonged operation with high input voltage at full power will cause the MOSFETs to overheat. A stand- alone fan with at least 200 LFM should always be provided. Figure 3. Temperature Rise at 48V IN with Figure 4. Temperature Rise at 48V IN with 10 µH Gowanda Inductor 10 µH Pulse Inductor 2 AN-1713 LM5116-12 Evaluation Board SNVA285A – October 2007 – Revised April 2013 Submit Documentation Feedback Copyright © 2007–2013, Texas Instruments Incorporated |
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同様の説明 - AN-1713 |
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