LM3430EVAL/NOPB

User's Guide SNVA187C – January 2007 – Revised May 2013 AN-1529 LM3430 Evaluation Board 1 Specifications of the Board The Evaluation Board has been designed for testing of various circuits using the LM3430 boost regulator controller. A complete schematic for all the components is shown in Figure 1. The board is two layers with components and power paths in 1oz. copper. The board is 62mil FR4 laminate. VIN L1 1 IN1 CIN2 2 RUV2 10 8 SYNC RUV1 RT 11 CSS OFF Q2 NC VDHC CINX 4 VIN RT UVLO SS LM3430 +C COMP OUT CS GND VCC FB RC1 VO D1 12 Q1 CO2 + CO1 COX 6 9 RS2 RS1 7 5 CF CSNS RSNS RFB2 3 CC2 RFB1 RPD CC1 Figure 1. Circuit Schematic 2 Example Circuit The example circuit that comes on the evaluation board delivers a 48V ±2% output voltage at currents up to 700 mA and switches at 600 kHz. The input voltage range is optimized between 10.8V and 26.4V. The measured efficiency of the converter is 96% at an input voltage of 24V and an output current of 0.7A. Figure 2. Efficiency All trademarks are the property of their respective owners. SNVA187C – January 2007 – Revised May 2013 Submit Documentation Feedback Copyright © 2007–2013, Texas Instruments Incorporated AN-1529 LM3430 Evaluation Board 1 Powering the Converter 3 www.ti.com Powering the Converter The example circuit for the LM3430 Evaluation Board is optimized to run at inputs of 12V or 24V, however the circuit will operate with input voltages ranging from 6.0V to 40.0V connected between the ‘VIN’ and ‘GND’ terminals on the right side of the board. Fixed loads, resistors, and variable electronic loads can be connected between the ‘Vo’ and ‘GND’ terminals on the left side of the board. Section 10 lists all the components used in the example circuit. 4 Enabling the Converter The OFF terminal controls the state of the converter while power is applied to the input terminals. The LM340 is disabled whenever the voltage at OFF is a logic high. (Above 2.0V.) The LM3430 is enabled whenever the OFF terminal is open-circuited or connected to ground. Upon enabling the LM3430 will perform a soft-start, after which the output is ready to supply current to the load. 5 Testing the Converter Figure 3 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 4 shows a diagram of this method. Ammeter Voltmeter V + 50W Electronic Load Ammeter Vo A Vin + A 40V, 6A Power Supply GND - GND V Voltmeter - LM3430 Evaluation Board Figure 3. Efficiency Measurement Setup Oscilloscope Vo GND Cox Figure 4. Output Voltage Ripple Measurement Setup 2 AN-1529 LM3430 Evaluation Board SNVA187C – January 2007 – Revised May 2013 Submit Documentation Feedback Copyright © 2007–2013, Texas Instruments Incorporated MOSFET Footprints www.ti.com 6 MOSFET Footprints The LM3430 evaluation board has a footprint for a single MOSFET with an SO-8 package using the industry standard pinout. (See Figure 5). 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 5. SO-8 MOSFET Pinout 7 Permanent Components The following components should remain the same for any new circuits evaluated on the LM3430 evaluation board. 8 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. SNVA187C – January 2007 – Revised May 2013 Submit Documentation Feedback Copyright © 2007–2013, Texas Instruments Incorporated AN-1529 LM3430 Evaluation Board 3 Typical Performance Characteristics 9 www.ti.com Typical Performance Characteristics 10V/Div 10V/Div VO VO SW SW 10V/Div 10V/Div 1 Ps/DIV 1 Ps/DIV Figure 6. Switch Node Voltage (VIN = 12V, IO = 0.5A) Figure 7. Switch Node Voltage (VIN = 24V, IO = 0.5A) VO VO 50 mV/DIV 50 mV/Div 1 Ps/DIV Figure 8. Output Voltage Ripple AC Coupled (VIN = 12V, IO = 0.5A) 4 AN-1529 LM3430 Evaluation Board 1 Ps/DIV Figure 9. Output Voltage Ripple AC Coupled (VIN = 24V, IO = 0.5A) SNVA187C – January 2007 – Revised May 2013 Submit Documentation Feedback Copyright © 2007–2013, Texas Instruments Incorporated Typical Performance Characteristics www.ti.com VO 5V/Div VO 500 mA/Div IO 1 ms/DIV 5V/Div 500 mA/Div IO 1 ms/DIV Figure 11. Load Transient Response (VIN = 24V, IO = 0 to 0.7A) Figure 10. Load Transient Response (VIN = 12V, IO = 0 to 0.7A) OFF 5V/Div OFF 5V/Div 20V/Div 20V/Div VO VO 20V/Div 20V/Div SW IIN SW 2A/Div IIN 400 és/DIV Figure 12. Start Up (VIN = 12V, IO = 0.5A) SNVA187C – January 2007 – Revised May 2013 Submit Documentation Feedback Copyright © 2007–2013, Texas Instruments Incorporated 2A/Div 200 Ps/DIV Figure 13. Shutdown (VIN = 12V, IO = 0.5A) AN-1529 LM3430 Evaluation Board 5 Typical Performance Characteristics OFF www.ti.com OFF 5V/Div 5V/Div 20V/Div VO VO SW 20V/Div 20V/Div SW IIN 2A/Div 20V/Div 2A/Div IIN 100 Ps/DIV 200 Ps/Div Figure 14. Start Up (VIN = 24V, IO = 0.5A) NGATE 2V/Div Figure 15. Shutdown (VIN = 24V, IO = 0.5A) 2V/Div NGATE 20 ns/DIV 20 ns/DIV Figure 16. NGATE Rise Time (VIN = 12V, no-load, Si4850DY) 6 AN-1529 LM3430 Evaluation Board Figure 17. NGATE Fall Time (VIN = 12V, no-load, Si4850DY) SNVA187C – January 2007 – Revised May 2013 Submit Documentation Feedback Copyright © 2007–2013, Texas Instruments Incorporated Bill of Materials www.ti.com 10 Bill of Materials ID Part Number Type Size U1 LM3430 Low-Side Controller WSON-12 Parameters Qty Vendor 1 Texas Instruments Q1 Si4850EY MOSFET SO-8 60V, 31mΩ, 27nC 1 Vishay D1 CMSH3-60M Schottky Diode SMB 60V, 3A 1 Central Semi L1 PF0553.333NL Inductor 12.5x12.5 x8mm 33µH, 6.22A, 60mΩ 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 VJ0805Y222KXXAT Capacitor 0805 2.2nF 10% 1 Vishay Cc2 VJ0805Y224KXXAT Capacitor 0805 220nF 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 CRCW08051621F Resistor 0805 1.62kΩ 1% 1 Vishay Rfb1 CRCW08055360F Resistor 0805 536Ω 1% 1 Vishay Rfb2 CRCW08052002F Resistor 0805 20kΩ 1% 1 Vishay Rs1 CRCW0805331J Resistor 0805 330Ω 5% 1 Vishay Rs2 CRCW08054990F Resistor 0805 499Ω 1% 1 Vishay Rsns WSL2010 0.1 1% Resistor 2010 0.1Ω 1%, 0.5W 1 Vishay Rt CRCW08053402F Resistor 0805 34kΩ 1% 1 Vishay Ruv1, Ruv2 CRCW0805103J Resistor 0805 10kΩ 5% 2 Vishay VIN, Vo, GND, GND2 160-1026 Terminal 0.094” 4 Cambion GND3, GND4, OFF, SYNC 160-1512 Terminal 0.062” 4 Cambion SNVA187C – January 2007 – Revised May 2013 Submit Documentation Feedback Copyright © 2007–2013, Texas Instruments Incorporated AN-1529 LM3430 Evaluation Board 7 PC Board Layout 11 www.ti.com PC Board Layout Figure 18. Top Layer and Top Overlay Figure 19. Bottom Layer 8 AN-1529 LM3430 Evaluation Board SNVA187C – January 2007 – Revised May 2013 Submit Documentation Feedback Copyright © 2007–2013, Texas Instruments Incorporated 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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