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LSN16A-W3 Datasheet(PDF) 7 Page - Murata Manufacturing Co., Ltd. |
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LSN16A-W3 Datasheet(HTML) 7 Page - Murata Manufacturing Co., Ltd. |
7 / 8 page MDC_LSN W3 Models.A01 Page 7 of 8 Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000 www.murata-ps.com Single Output LSN-W3 Models Non-Isolated, 3-5.5VIN, 0.75-3.3VOUT 16 Amp DC/DC Converters LSN W3 DC/DC converters do not suffer from Output Reverse Conduction. They employ proprietary gate drive circuitry that makes them immune to moderate applied output overvoltages. Thermal Considerations and Thermal Protection The typical output-current thermal-derating curves shown below enable designers to determine how much current they can reliably derive from each model of the LSN W3 Series under known ambient-temperature and air-flow conditions. Similarly, the curves indicate how much air flow is required to reli- ably deliver a specific output current at known temperatures. The highest temperatures in LSN W3’s occur at their output inductor, whose heat is generated primarily by I2R losses. The derating curves were developed using thermocouples to monitor the inductor temperature and varying the load to keep that temperature below +110°C under the assorted conditions of air flow and air temperature. Once the temperature exceeds +115°C (approx.), the thermal protection will disable the converter. Automatic restart occurs after the temperature has dropped below +110°C. As you may deduce from the derating curves and observe in the efficiency curves on the following pages, LSN W3’s maintain virtually constant efficiency from half to full load, and consequently deliver very impressive temperature performance even if operating at full load. Lastly, when LSN W3’s are installed in system boards, they are obviously subject to numerous factors and tolerances not taken into account here. If you are attempting to extract the most current out of these units under demanding temperature conditions, we advise you to monitor the output-inductor tempera- ture to ensure it remains below +110°C at all times. 20 Amps Extended Operation Under restricted conditions, the LSN W3 models with low output voltages may produce up to 20 Amps of output current up to approximately +45°C ambient temperature. There is no model number change. The Derating curve illustrates typical performance. For this test, the converter was mounted on a 12cm x12cm double-sided pc board with 2 ounce copper. This 20 Amp operation is available with the following restrictions: • Only 1.2 Volt and 1.5 Volt output models are verified for operation at this time. • The user must assure that there is adequate airflow at all times with no airflow blockage by other large components. Make sure no adjacent components have high temperatures. Be aware of systems using a CPU temperature monitor to control the fan. • Use only low to moderate ambient temperature. • The user must assure that the total output power is not exceeded. • This operation applies only to nominal input line voltage. Since effi- ciency degrades at low line voltage, internal heat dissipation increases, thereby exceeding the maximum output power. The Derating curve is drawn where the hot spot on the converter (usually a power FET) reaches approximately +115°C. Although operation is possible slightly beyond this point, DATEL strongly advises using this as the maxi- mum temperature for greatest reliability. Do not forget that a small overcurrent glitch while running 20 Amps output could instantly shut down the converter using the Over Current sensor. This margin of safety is considerably wider at 16 Amps maximum current. Make sure your output current usage is smooth!! If you are in doubt, contact DATEL to discuss your application. |
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