LM5022EVAL/NOPB

User's Guide SNVA203C – January 2007 – Revised May 2013 AN-1557 LM5022 Evaluation Board The AN-1557 is an evaluation module that demonstrates a typical 20W Boost converter featuring the LM5022 60V low-side controller in a design that shows high efficiency in a single-ended application. 1 2 3 4 5 6 7 8 9 10 11 12 Contents Specifications Of The Board ............................................................................................... Example Circuit .............................................................................................................. Powering The Converter ................................................................................................... Loading The Converter ..................................................................................................... Enabling The Converter .................................................................................................... Testing The Converter ..................................................................................................... MOSFET Footprints ........................................................................................................ Permanent Components ................................................................................................... Additional Footprints ........................................................................................................ Typical Performance Characteristics ..................................................................................... Bill of Materials .............................................................................................................. PC Board Layout ............................................................................................................ 2 2 2 2 2 3 3 4 4 6 8 9 List of Figures 1 Efficiency ..................................................................................................................... 2 2 SO-8 MOSFET Pinout ...................................................................................................... 3 3 Circuit Schematic 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 ........................................................................................................... Efficiency Measurement Setup ............................................................................................ Output Voltage Ripple Measurement Setup ............................................................................. Switch Node Voltage (VIN = 9V, IO = 0.5A) ............................................................................... Switch Node Voltage (VIN = 16V, IO = 0.5A) ............................................................................. Output Voltage Ripple AC Coupled (VIN = 9V, IO = 0.5A) .............................................................. Output Voltage Ripple AC Coupled (VIN = 16V, IO = 0.5A) ............................................................ Load Transient Response (VIN = 9V, IO = 50 mA to 0.5A) ............................................................. Load Transient Response (VIN = 16V, IO = 50 mA to 0.5A) ............................................................ Start Up (VIN = 9V, IO = 0.5A) .............................................................................................. Shut Down (VIN = 9V, IO = 0.5A)........................................................................................... Start Up (VIN = 16V, IO = 0.5A) ............................................................................................ Shutdown (VIN = 16V, IO = 0.5A) .......................................................................................... NGATE Rise Time (VIN = 9V, IO = 0.1A, Si4850DY) .................................................................... NGATE Fall Time (VIN = 12V, IO = 0.1A, Si4850DY) ................................................................... Top Layer and Top Overlay ............................................................................................... Bottom Layer ................................................................................................................ 4 4 5 6 6 6 6 6 6 7 7 7 7 7 7 9 9 All trademarks are the property of their respective owners. SNVA203C – January 2007 – Revised May 2013 Submit Documentation Feedback Copyright © 2007–2013, Texas Instruments Incorporated AN-1557 LM5022 Evaluation Board 1 Specifications Of The Board 1 www.ti.com Specifications Of The Board The Evaluation Board has been designed for testing of various circuits using the LM5022 boost regulator controller. A complete schematic for all the components is shown in Figure 3. The board is two layers with components and power paths in 1oz. copper. The board is 62mil FR4 laminate, and a complete bill of materials is listed at the end of this document. 2 Example Circuit The example circuit which comes on the evaluation board delivers a 40V ±2% output voltage at currents up to 500 mA and switches at 500 kHz. The input voltage range is optimized between 9.0V and 16.0V. The measured efficiency of the converter is 95% at an input voltage of 16V and an output current of 0.5A. Figure 1. Efficiency 3 Powering The Converter The example circuit for the LM5022 Evaluation Board is optimized to run at 12V, however the circuit will operate with input voltages ranging from 6.0V to 32.0V connected between the VIN and GND terminals on the right side of the board. 4 Loading The Converter The example circuit will startup with no load at the output, and can also start up with loads of up to 0.5A as long as the input voltage is above 9.0V. The maximum output current will be reduced for input voltages below 9.0V. Fixed loads, resistors, and variable electronic loads can be connected between the Vo and GND terminals on the left side of the board. 5 Enabling The Converter The OFF terminal controls the state of the converter while power is applied to the input terminals. The LM5022 is disabled whenever the voltage at OFF is a logic high. (Above 2.0V.) The LM5022 is enabled whenever the OFF terminal is open-circuited or connected to ground, in which case startup will begin as soon as the input voltages exceeds 6.0V. Upon enabling the LM5022 will perform a soft-start, after which the output is ready to supply current to the load. 2 AN-1557 LM5022 Evaluation Board SNVA203C – January 2007 – Revised May 2013 Submit Documentation Feedback Copyright © 2007–2013, Texas Instruments Incorporated Testing The Converter www.ti.com 6 Testing The Converter Figure 4 shows a block diagram of connections for making measurements of efficiency. The wires used for making connections at both the input and output should be rated to at least 10A of continuous current and should be no longer than is needed for convenient testing. A series ammeter capable of measuring 10A or more should be used for both the input and the output lines. Dedicated voltmeters should be connected with their positive and negative leads right at the four power terminals at the sides of the evaluation board. This measurement technique minimizes the resistive loss in the wires that connect the evaluation board to the input power supply and the electronic load. Output voltage ripple measurements should be taken directly across the 100 nF ceramic capacitor Cox, placed right between the output terminals. Care must be taken to minimize the loop area between the oscilloscope probe tip and the ground lead. One method to minimize this loop is to remove the probe’s spring tip and ‘pigtail’ ground lead and then wind bare wire around the probe shaft. The bare wire should contact the ground of the probe, and the end of the wire can then contact the ground side of Cox. Figure 5 shows a diagram of this method. 7 MOSFET Footprints The LM5022 evaluation board has a footprint for a single MOSFET with an SO-8 package using the industry standard pinout. (See Figure 2) This footprint can also accept newer MOSFET packages that are compatible with SO-8 footprints. S D S D SO-8 S D G D Figure 2. SO-8 MOSFET Pinout SNVA203C – January 2007 – Revised May 2013 Submit Documentation Feedback Copyright © 2007–2013, Texas Instruments Incorporated AN-1557 LM5022 Evaluation Board 3 Permanent Components 8 www.ti.com Permanent Components The following components should remain the same for any new circuits evaluated on the LM5022 evaluation board: 9 Name Value Cox, Cinx 0.1 µF Cf 1 µF Csns 1 nF Rpd 10 kΩ Rs1 100Ω Additional Footprints The 100 pF capacitor Csyc provides an AC input path for external clock synchronization. Detection of the sync pulse requires a peak voltage level greater than 3.8V at the RT/SYNC pin. Note that the DC voltage at RT/SYNC is approximately 2V to allow compatibility with 3.3V logic. The sync pulse width should be set between 15 ns to 150 ns by the external components. The Rt resistor is always required, whether the oscillator is free running or externally synchronized. Rt must be selected so that the free-running oscillator frequency is below the lowest synchronization frequency. VIN L1 VO D1 33 PH + CIN1 4.7 PF CIN2 CINX 4.7 PF 0.1 PF 1 10 k: VIN RT CSS 7 RUV1 2.61 k: 0.1 nF RT 33.2 k: 10 CSS 10 nF OFF Q2 10 k: UVLO SS OUT GND VCC COMP FB Rc RS2 COX 0.1 PF RS1 6 4 3.57 k: 100: RSNS CSNS 1 nF CF 0.1: RFB2 20 k: 2 RFB1 649: CC2 RPD 3.01 k: + CO1 4.7 PF CS 1 PF 3 4.7 PF 5 8 LM5022 9 SYNC CO2 Q1 RUV2 120 nF CC1 560 pF Figure 3. Circuit Schematic Ammeter Voltmeter V + 50W Electronic Load - A Ammeter Vo Vin + A 60V, 6A Power Supply GND GND V Voltmeter - LM5022 Evaluation Board Figure 4. Efficiency Measurement Setup 4 AN-1557 LM5022 Evaluation Board SNVA203C – January 2007 – Revised May 2013 Submit Documentation Feedback Copyright © 2007–2013, Texas Instruments Incorporated Additional Footprints www.ti.com Oscilloscope Solid 18 or 20 Ga wire GND Vo Cox Figure 5. Output Voltage Ripple Measurement Setup SNVA203C – January 2007 – Revised May 2013 Submit Documentation Feedback Copyright © 2007–2013, Texas Instruments Incorporated AN-1557 LM5022 Evaluation Board 5 Typical Performance Characteristics 10 www.ti.com Typical Performance Characteristics 10V/DIV 10V/DIV VO VO SW SW 10V/DIV 10V/DIV 1 és/DIV 1 és/DIV Figure 6. Switch Node Voltage (VIN = 9V, IO = 0.5A) VO Figure 7. Switch Node Voltage (VIN = 16V, IO = 0.5A) VO 50 mV/DIV 50 mV/DIV 1 és/DIV 1 és/DIV Figure 8. Output Voltage Ripple AC Coupled (VIN = 9V, IO = 0.5A) 6 AN-1557 LM5022 Evaluation Board Figure 9. Output Voltage Ripple AC Coupled (VIN = 16V, IO = 0.5A) SNVA203C – January 2007 – Revised May 2013 Submit Documentation Feedback Copyright © 2007–2013, Texas Instruments Incorporated Typical Performance Characteristics www.ti.com 200 mA/DIV 200 mA/DIV IO IO VO VO 1V/DIV 2V/DIV 400 és/DIV 1 ms/DIV Figure 10. Load Transient Response (VIN = 9V, IO = 50 mA to 0.5A) OFF* OFF* 5V/DIV 5V/DIV 20V/DIV 20V/DIV VO Figure 11. Load Transient Response (VIN = 16V, IO = 50 mA to 0.5A) VO 20V/DIV 20V/DIV SW SW 1V/DIV IIN 2A/DIV IIN 2A/DIV 200 és/DIV 400 és/DIV Figure 12. Start Up (VIN = 9V, IO = 0.5A) OFF* Figure 13. Shut Down (VIN = 9V, IO = 0.5A) OFF* 5V/DIV 5V/DIV 20V/DIV 20V/DIV VO VO 20V/DIV 20V/DIV SW SW IIN 2A/DIV IIN 2A/DIV 200 és/DIV 400 és/DIV Figure 14. Start Up (VIN = 16V, IO = 0.5A) SNVA203C – January 2007 – Revised May 2013 Submit Documentation Feedback Copyright © 2007–2013, Texas Instruments Incorporated Figure 15. Shutdown (VIN = 16V, IO = 0.5A) AN-1557 LM5022 Evaluation Board 7 Bill of Materials www.ti.com 2V/DIV NGATE 2V/DIV NGATE 20 ns/DIV 20 ns/DIV Figure 16. NGATE Rise Time (VIN = 9V, IO = 0.1A, Si4850DY) 11 8 Figure 17. NGATE Fall Time (VIN = 12V, IO = 0.1A, Si4850DY) Bill of Materials ID Part Number Type Size U1 LM5022 Low-Side Controller VSSOP-10 Parameters Qty Vendor 1 TI Q1 Si4850EY MOSFET SO-8 60V, 31mΩ, 27nC 1 Vishay D1 CMSH2-60M Schottky Diode SMA 60V, 2A 1 Central Semi L1 SLF12575T-330M3R2 Inductor 12.5x12.5 x7.5mm 33µH, 3.2A, 40mΩ 1 Pulse Cin1 Cin2 C4532X7R1H475M Capacitor 1812 4.7µF, 50V 2 TDK Co1 Co2 C5750X7R2A475M Capacitor 2220 4.7µF, 100V, 2mΩ 2 TDK Cf C3216X7R1E105K Capacitor 1206 1µF, 25V 1 TDK Cinx Cox C2012X7R2A104M Capacitor 0805 100nF, 100V 2 TDK Cc1 VJ0805Y561KXXAT Capacitor 0805 560pF 10% 1 Vishay Cc2 VJ0805Y124KXXAT Capacitor 0805 120nF 10% 1 Vishay Css VJ0805Y103KXXAT Capacitor 0805 10nF 10% 1 Vishay Csns VJ0805Y102KXXAT Capacitor 0805 1nF 10% 1 Vishay Csyc VJ0805A101KXXAT Capacitor 0805 100pF 10% 1 Vishay Rc CRCW08053011F Resistor 0805 3.01kΩ 1% 1 Vishay Rfb1 CRCW08056490F Resistor 0805 649Ω 1% 1 Vishay Rfb2 CRCW08052002F Resistor 0805 20kΩ 1% 1 Vishay Rs1 CRCW0805101J Resistor 0805 100Ω 5% 1 Vishay Rs2 CRCW08053571F Resistor 0805 3.57kΩ 1% 1 Vishay Rsns ERJL14KF10C Resistor 1210 0.1Ω 1%, 0.5W 1 Vishay Rt CRCW08053322F Resistor 0805 33.2kΩ 1% 1 Vishay Ruv1 CRCW08052611F Resistor 0805 2.61kΩ 1% 1 Vishay Ruv1 Ruv2 CRCW08051002F Resistor 0805 10kΩ 1% 1 Vishay VIN, Vo GND GND2 160-1026 Terminal 0.094” 4 Cambion GND3 GND4 OFF SYNC 160-1512 Terminal 0.062” 4 Cambion AN-1557 LM5022 Evaluation Board SNVA203C – January 2007 – Revised May 2013 Submit Documentation Feedback Copyright © 2007–2013, Texas Instruments Incorporated PC Board Layout www.ti.com 12 PC Board Layout Figure 18. Top Layer and Top Overlay Figure 19. Bottom Layer SNVA203C – January 2007 – Revised May 2013 Submit Documentation Feedback Copyright © 2007–2013, Texas Instruments Incorporated AN-1557 LM5022 Evaluation Board 9 IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete. All semiconductor products (also referred to herein as “components”) are sold subject to TI’s terms and conditions of sale supplied at the time of order acknowledgment. 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