LMZ10505EXTEVAL/NOPB

User's Guide SNVA450B – July 2010 – Revised April 2013 AN-2074 LMZ1050xEXT Evaluation Board 1 Introduction The LMZ1050xEXT SIMPLE SWITCHER® power module is a complete, easy-to-use DC-DC solution capable of driving up to 3A, 4A, or 5A load with exceptional power conversion efficiency, output voltage accuracy, line and load regulation. The LMZ1050xEXT is available in an innovative package that enhances thermal performance and allows for hand or machine soldering. The LMZ1050xEXT can accept an input voltage rail between 2.95V and 5.5V and deliver an adjustable and highly accurate output voltage as low as 0.8V. One megahertz fixed frequency PWM switching provides a predictable EMI characteristic. Two external compensation components can be adjusted to set the fastest response time, while allowing the option to use ceramic and/or electrolytic output capacitors. Externally programmable soft-start capacitor facilitates controlled startup. The LMZ1050xEXT is a reliable and robust solution with the following features: lossless cycle-by-cycle peak current limit to protect for over current or short-circuit fault, thermal shutdown, input under-voltage lock-out, and pre-biased startup. 2 Board Specifications • • • • • • • • 3 VIN = 2.95V to 5.5V VOUT = 2.5V (default output voltage setting, refer to Table 2 for other output settings) ±2.5% feedback voltage accuracy at 2.5V output (Including line and load regulation from TJ = -55°C to 125°C) ±1.63% feedback voltage accuracy over temperature IOUT = 0A to 3A, 4A, and 5A θJA = 20°C/W, θJC = 1.9°C/W Designed on four layers, the top and bottom layers are 1oz. copper and the two inner layers are 1/2 oz. copper weight Measures 2.25 in. x 2.25 in. (5.8 cm x 5.8 cm) and is 62mil (.062”) thick on a FR4 laminate Evaluation Board Design Concept The evaluation board is designed to demonstrate low conducted noise on the input and output lines, as seen in Figure 11 and Figure 14. Four input capacitors (Cin1 - C in4) and three output capacitors (Co1 - Co3) are populated for this purpose. All the input and output filter capacitors are not necessary to comply with radiation standards. For a circuit example that passes radiated emissions standards (EN55022, class B) please refer to Figure 19. Additionally, Cin5 is present to reduce the resonance of the input line produced by the inductance and resistance in the cables connecting the bench power supply to the evaluation board and the input capacitors. All trademarks are the property of their respective owners. SNVA450B – July 2010 – Revised April 2013 Submit Documentation Feedback AN-2074 LMZ1050xEXT Evaluation Board Copyright © 2010–2013, Texas Instruments Incorporated 1 Additional Component Footprints 4 www.ti.com Additional Component Footprints When the tracking feature of the LMZ1050xEXT is used, remove the soft-start capacitor CSS and use a resistor divider on designators Rtrkb and Rtrkt. The ground and Vtrk post have been provided for easy connection. The LMZ1050xEXT eval board incorporates a precision enable circuit which is pulled high by a 100 kΩ pull up resistor to VIN. This allows the user to pull low on the enable pin to ground. The top enable resistor is Rent and the bottom enable resistor is Renb. Refer to the Design Guideline and Operating Description section of the LMZ1050xEXT data sheet for detailed design implementation. Select FPGAs specify input inrush currents for particular power-up sequences and others require sequencing rails to avoid start-up or latch-up problems. To prevent early turn-on of the LMZ1050xEXT in systems with multiple power rails, precision enable and tracking are useful as the main input voltage rail rises at power-up. 5 Component Circuit Schematic U1 VIN 1 VIN Cin5 + Cin4 Cin3 Cin2 Cin1 VOUT 6, 7 CO1 LMZ1050xEXT Ren1 Optional VOUT 2 FB EN GND SS 3 CO2 CO3 5 Rfbt 4, EP CSS Rcomp Ccomp Rfbb Figure 1. Component Schematic for Evaluation Board 2 AN-2074 LMZ1050xEXT Evaluation Board Copyright © 2010–2013, Texas Instruments Incorporated SNVA450B – July 2010 – Revised April 2013 Submit Documentation Feedback Component Circuit Schematic www.ti.com Table 1. Bill of Materials for Evaluation Board, VIN = 3.3V to 5V, VOUT = 2.5V Designator Description Case Size Manufacturer Manufacturer P/N Quantit y U1 SIMPLE SWITCHER® PFM-7 Texas Instruments LMZ10503/LMZ10504/LMZ10 505EXTTZ 1 Cin1 1 µF, X7R, 16V 0805 TDK C2012X7R1C105K 1 Cin2, CO1 4.7 µF, X5R, 6.3V 0805 TDK C2012X5R0J475K 2 Cin3, CO2 22 µF, X5R, 16V 1210 TDK C3225X5R1C226M 2 Cin4 47 µF, X5R, 6.3V 1210 TDK C3225X5R0J476M 1 CO3 100 µF, X5R, 6.3V 1812 TDK C4532X5R0J107M 1 Rfbt 75 kΩ 0805 Vishay Dale CRCW080575K0FKEA 1 Rfbb 34.8 kΩ 0805 Vishay Dale CRCW080534K8FKEA 1 Rcomp 1.1 kΩ 0805 Vishay Dale CRCW08051K10FKEA 1 Ccomp 180 pF, ±5%, C0G, 50V 0603 TDK C1608C0G1H181J 1 Ren1 100 kΩ 0805 Vishay Dale CRCW0805100KFKEA 1 CSS 10 nF, ±5%, C0G, 50V 0805 TDK C2012C0G1H103J 1 Table 2. Output Voltage Setting (Rfbt = 75 kΩ) VOUT Rfbb 3.3 V 23.7 kΩ 2.5 V 34.8 kΩ 1.8 V 59 kΩ 1.5 V 84.5 kΩ 1.2 V 150 kΩ 0.9 V 590 kΩ SNVA450B – July 2010 – Revised April 2013 Submit Documentation Feedback AN-2074 LMZ1050xEXT Evaluation Board Copyright © 2010–2013, Texas Instruments Incorporated 3 Complete Circuit Schematic (Optional CO) Complete Circuit Schematic CO1 CO2 CO3 VOUT 6 www.ti.com Ccomp Rcomp Rfbb 4, EP GND FB LMZ1050xEXT SS 3 CSS Vtrk Renb 2 (Optional Cin) VIN Cin5 + Cin4 Cin3 Cin2 Cin1 EN Rent Rtrkb Rtrkt EN 1 VIN U1 VOUT 5 6, 7 Rfbt Figure 2. Complete Evaluation Board Schematic 4 AN-2074 LMZ1050xEXT Evaluation Board Copyright © 2010–2013, Texas Instruments Incorporated SNVA450B – July 2010 – Revised April 2013 Submit Documentation Feedback Connection Diagram www.ti.com 7 Connection Diagram Ammeter Ammeter A + 30W, 5A Electronic Load A + 10V, 4A Power Supply - Vo Voltmeter GND GND Vin V V Voltmeter LMZ1050xEXT Evaluation Board Figure 3. Efficiency Measurement Setup Oscilloscope Vo GND Co1 Figure 4. Output Voltage Ripple Measurement Setup SNVA450B – July 2010 – Revised April 2013 Submit Documentation Feedback AN-2074 LMZ1050xEXT Evaluation Board Copyright © 2010–2013, Texas Instruments Incorporated 5 Connection Diagram www.ti.com Efficiency vs. Load Current LMZ10504EXT & LMZ10505EXT, VOUT = 2.5V, TAMB = 25°C 6 Efficiency vs. Load Current LMZ10503EXT, VOUT = 2.5V, TAMB = 25°C AN-2074 LMZ1050xEXT Evaluation Board Copyright © 2010–2013, Texas Instruments Incorporated SNVA450B – July 2010 – Revised April 2013 Submit Documentation Feedback Performance Characteristics www.ti.com 8 Performance Characteristics Figure 5. Current Derating vs. Ambient Temperature LMZ10503EXT, VIN = 5.0V, θJA = 20°C/W Figure 6. Current Derating vs. Ambient Temperature LMZ10504EXT, VIN = 5.0V, θJA = 20°C/W Figure 7. Current Derating vs. Ambient Temperature LMZ10505EXT, VIN = 5.0V, θJA = 20°C/W Figure 8. Current Derating vs. Ambient Temperature LMZ10503EXT, VIN = 3.3V, θJA = 20°C/W Figure 9. Current Derating vs. Ambient Temperature LMZ10504EXT, VIN = 3.3V, θJA = 20°C/W Figure 10. Current Derating vs. Ambient Temperature LMZ10505EXT, VIN = 3.3V, θJA = 20°C/W SNVA450B – July 2010 – Revised April 2013 Submit Documentation Feedback AN-2074 LMZ1050xEXT Evaluation Board Copyright © 2010–2013, Texas Instruments Incorporated 7 Performance Characteristics 8 www.ti.com Figure 11. Output Voltage Ripple VIN = 5V, VOUT = 2.5V, IOUT = 3A, 4A, & 5A LMZ10503EXT / LMZ10504EXT / LMZ10505EXT Figure 12. Load Transient Response VIN = 5.0V, VOUT = 2.5V LMZ10503EXT, IOUT = 400 mA to 2.7A, 20 MHz Bandwidth Limit Figure 13. Load Transient Response VIN = 5V, VOUT = 2.5V LMZ10504EXT, IOUT = 400 mA to 3.6A, 20 MHz Bandwidth Limit Figure 14. Output Voltage Ripple VIN = 3.3V, VOUT = 2.5V, IOUT = 3A, 4A, & 5A LMZ10503EXT / LMZ10504EXT / LMZ10505EXT AN-2074 LMZ1050xEXT Evaluation Board Copyright © 2010–2013, Texas Instruments Incorporated SNVA450B – July 2010 – Revised April 2013 Submit Documentation Feedback Performance Characteristics www.ti.com Figure 15. Load Transient Response VIN = 3.3V, VOUT = 2.5V LMZ10503EXT, IOUT = 300 mA to 2.7A, 20 MHz Bandwidth Limit Figure 16. Load Transient Response VIN = 3.3V, VOUT = 2.5V LMZ10504EXT, IOUT = 400 mA to 3.6A, 20 MHz Bandwidth Limit Figure 17. Load Transient Response VIN = 5.0V, VOUT = 2.5V LMZ10505EXT, IOUT = 500 mA to 4.5A, 20 MHz Bandwidth Limit Figure 18. Load Transient Response VIN = 3.3V, VOUT = 2.5V LMZ10505EXT, IOUT = 500 mA to 4.5A, 20 MHz Bandwidth Limit SNVA450B – July 2010 – Revised April 2013 Submit Documentation Feedback AN-2074 LMZ1050xEXT Evaluation Board Copyright © 2010–2013, Texas Instruments Incorporated 9 Circuit Example: Complies with EN55022 Class B Radiated Emissions 9 www.ti.com Circuit Example: Complies with EN55022 Class B Radiated Emissions U1 VIN 1 VOUT VIN VOUT 6, 7 CO1 LMZ1050xEXT Cin3 Cin2 Cin1 2 FB EN 5 GND SS 3 Rfbt 4, EP CSS Rcomp Ccomp Rfbb Figure 19. Component Schematic, VIN = 5V, VOUT = 2.5V, Complies with EN55022 Class B Radiated Emissions Table 3. Bill of Materials Designator Description Case Size Manufacturer Manufacturer P/N Quantit y U1 SIMPLE SWITCHER® PFM-7 Texas Instruments LMZ10503/LMZ10504/LMZ10 505EXTTZ 1 Cin1 1 µF, X7R, 16V 0805 TDK C2012X7R1C105K 1 Cin2 4.7 µF, X5R, 6.3V 0805 TDK C2012X5R0J475K 1 Cin3 47 µF, X5R, 6.3V 1210 TDK C3225X5R0J476M 1 CO1 100 µF, X5R, 6.3V 1812 TDK C4532X5R0J107M 1 Rfbt 75 kΩ 0805 Vishay Dale CRCW080575K0FKEA 1 Rfbb 34.8 kΩ 0805 Vishay Dale CRCW080534K8FKEA 1 Rcomp 1.1 kΩ 0805 Vishay Dale CRCW08051K10FKEA 1 Ccomp 180 pF, ±5%, C0G, 50V 0603 TDK C1608C0G1H181J 1 CSS 10 nF, ±5%, C0G, 50V 0805 TDK C2012C0G1H103J 1 Figure 20. Radiated Emissions (EN55022, Class B) VIN = 5V, VOUT = 2.5V, IOUT = 3A Tested on LMZ10503EXT Evaluation Board 10 Figure 21. Radiated Emissions (EN55022, Class B) VIN = 5V, VOUT = 2.5V, IOUT = 4A Tested on LMZ10504EXT Evaluation Board AN-2074 LMZ1050xEXT Evaluation Board Copyright © 2010–2013, Texas Instruments Incorporated SNVA450B – July 2010 – Revised April 2013 Submit Documentation Feedback PCB Layout Diagram www.ti.com Figure 22. Radiated Emissions (EN55022, Class B) VIN = 5V, VOUT = 2.5V, IOUT = 5A Tested on LMZ10505EXT Evaluation Board 10 PCB Layout Diagram Figure 23. Top Layer SNVA450B – July 2010 – Revised April 2013 Submit Documentation Feedback AN-2074 LMZ1050xEXT Evaluation Board Copyright © 2010–2013, Texas Instruments Incorporated 11 PCB Layout Diagram www.ti.com Figure 24. Internal Layer I (Ground) Figure 25. Internal Layer II (Ground) 12 AN-2074 LMZ1050xEXT Evaluation Board Copyright © 2010–2013, Texas Instruments Incorporated SNVA450B – July 2010 – Revised April 2013 Submit Documentation Feedback PCB Layout Diagram www.ti.com Figure 26. Bottom Layer SNVA450B – July 2010 – Revised April 2013 Submit Documentation Feedback AN-2074 LMZ1050xEXT Evaluation Board Copyright © 2010–2013, Texas Instruments Incorporated 13 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. TI warrants performance of its components to the specifications applicable at the time of sale, in accordance with the warranty in TI’s terms and conditions of sale of semiconductor products. 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