LM5071HEEVAL National Semiconductor, LM5071HEEVAL Datasheet
![no-image](/images/manufacturer_photos/0/4/469/national_semiconductor_sml.jpg)
LM5071HEEVAL
Specifications of LM5071HEEVAL
LM5071HEEVAL Summary of contents
Page 1
... AUX input voltage range 60V • Measured maximum efficiency: With the installed wide-voltage-range EP13 transformer converter efficiency: 81 Overall efficiency (including diode bridge): 78. With the optional, efficiency-optimized EP13 trans- © 2006 National Semiconductor Corporation National Semiconductor Application Note 1430 Youhao Xi April 2006 former converter efficiency: 84 Overall efficiency (including diode bridge): 81 ...
Page 2
www.national.com 2 ...
Page 3
Connection and Proper Test Methods FIGURE 2. LM5071 Evaluation Board Connections Figure 2 shows the connections for the LM5071 evaluation board. The LM5071 evaluation board has three ports for connec- tions. The RJ45 receptacle connector is for PoE input, the ...
Page 4
Power Up (Continued) is observed likely that the AUX power feed polarity is reversed. After successful operation is observed, full power testing can begin. PD Interface Operating Modes When connecting into the PoE system, the evaluation board’s Powered ...
Page 5
Input UVLO and UVLO Hysteresis The input UVLO threshold and UVLO hysteresis can be independently programmed by selecting R5 and R37. The UVLO release threshold level is mainly determined by the ratio of R37 and R5, as governed by the ...
Page 6
The Factors Limiting the Minimum Operating Input Voltage The LM5071 is capable of operating with an AUX power source of as low as 10.5V (after the AUX input OR-ing-diode drop, the VIN pin sees 9.5V). However, the minimum oper- ating ...
Page 7
Performance Characteristics (Continued) Horizontal Resolution: 5 ms/Div. Trace 1: RTN pin, elevated until UVLO release. 5V/Div. Trace 2: SS pin, starts when VCC achieves minimum regu- lation. 5V/Div. < Trace 3: VCC, starts when RTN 1.5V, elevated by auxiliary winding. ...
Page 8
Performance Characteristics (Continued) Horizontal Resolution: 2 ms/Div. Trace 1: RTN pin of the LM5071 IC, 1V/Div. Trace 2: Softstart pin, 2V/Div. Trace 3: Test board input current, 200 mA/Div. FIGURE 7. Shorted Output Fault Condition / Automatic Re-try STEP RESPONSE ...
Page 9
Performance Characteristics (Continued) Horizontal Resolution: 1 µs/Div. Trace 1: Reverse voltage across output rectifier diode D5, 5V/Div. FIGURE 11. Output Rectifier Reverse Voltage Waveform Reconfiguration Of The Evaluation Board For 3.3V And 5V Dual Outputs The standard evaluation circuit can ...
Page 10
www.national.com 10 ...
Page 11
11 www.national.com ...
Page 12
A Note For Using The Efficiency Optimized EP13 Power Transformer DA2383 Please note that the DA2383 is a single output transformer. When using a DA2383 to obtain better efficiency (See Figure 3 for the applicable load and AUX input voltage ...
Page 13
Appendix: LM5071 Evaluation Board Bill of Materials ITEM PART NUMBER R1 CRCW2512100J R2 CRCW2512100J R3 CRCW120649R9F R4 CRCW 120610R0F R5 CRCW08055903F R6 CRCW08051001F R7 CRCW080510R0F R9 CRCW08051000F R11 CRCW08051002F R12 CRCW08052432F R13 CRCW08052612F R14 CRCW12060R301F R15 CRCW12060R301F R16 CRCW08051001F R17 ...
Page 14
... BANNED SUBSTANCE COMPLIANCE National Semiconductor manufactures products and uses packing materials that meet the provisions of the Customer Products Stewardship Specification (CSP-9-111C2) and the Banned Substances and Materials of Interest Specification (CSP-9-111S2) and contain no ‘‘Banned Substances’’ as defined in CSP-9-111S2. ...