LMZ23605EVAL/NOPB

User's Guide SNVA457B – March 2011 – Revised April 2013 AN-2085 LMZ23605/03, LMZ22005/03 Evaluation Board 1 Introduction The LMZ23605/03, LMZ22005/03 evaluation boards are designed to be an easy-to-use platform to evaluate the full capabilities of this family of SIMPLE SWITCHER® power modules. The PCB construction has excellent thermal performance and includes extra locations for optional components that may not be required in the end application. The LMZ23605/03 can accept an input voltage rail between 6V and 36V and the LMZ22005/03 can accept an input voltage rail between 6V and 20V. The devices can deliver an adjustable and highly accurate output voltage as low as 0.8V and as high as 6V. The control architecture is constant frequency PWM with emulated current mode sensing. The control loop operates well with low ESR output capacitors such as ceramics or specialty polymer. The precision enable input allows for programmable UVLO on the input supply or flexibility in sequencing. The external soft-start capacitor facilitates controlled output rise time at startup. The module family is a reliable and robust solution with cycle-by-cycle valley current limit to protect for over current or short-circuit faults. Additionally there is thermal shutdown protection, and they will start up into a pre-biased output. The free-running switching frequency is 812 kHz (typ) and a 650 kHz to 950 kHz synchronization range is supported. 2 Board Specifications • • • • • • • • VIN = 6V to 36V (LMZ22005/03 limited to 20V) Enable UVLO = 5.7V VOUT = 3.3V IOUT = 0 to 5A (LMZ23603 and LMZ22003 limited to 3A) θJA = 12°C / W, θJC = 1.9°C/W PCB designed on four layers; Inner are 2 oz; Outer are 3 oz. Measures 3.5 in. x 3.5 in. (8.9 cm x 8.9 cm) and is 62mil (.062”) thick of FR4 laminate material Max ambient temp of 70°C at full 5A load (12 Vin) For additional circuit considerations refer to the Applications Section of the LMZ23605/03 or LMZ22005/03 data sheets. For negative output voltage connections follow the method shown in AN-2027. All trademarks are the property of their respective owners. SNVA457B – March 2011 – Revised April 2013 Submit Documentation Feedback AN-2085 LMZ23605/03, LMZ22005/03 Evaluation Board Copyright © 2011–2013, Texas Instruments Incorporated 1 Performance Characteristics www.ti.com VOUT SS/TRK FB PGND AGND Sync VIN EN VIN SYNC LMZ Module Enable RSN VOUT 6V 5V 3.3V 2.5V 1.8V 1.5V 1.2V 1.0V 0.8V RFBT 15.4k 5.62k 3.32k 2.26k 1.87k 1.00k 1.07k 1.62k 0 RFBB 2.37k 1.07k 1.07k 1.07k 1.50k 1.13k 2.05k 6.49k 8.06k VIN Range 10...36V 9...36V 7...36V 6...36V 6...36V 6...36V 6...36V 6...36V 6...36V 3.3 VOUT RENH 100Ö 1.50 kÖ RFBT 3.32 kÖ D1 RENT 44.2kÖ RENB See table 5.1V OPT 12.7 kÖ * CIN1,2,4,5 2 x 10 PF + 2 x 0.047 µF 50V CIN6 CSS 150 PF OPT 0.47 PF CO2 100 PF X5R OPT RFBB 1.07 kÖ See table + CO5 220 PF 6.3V SP Figure 1. Evaluation Board Simplified Schematic 3 Performance Characteristics LMZ23605 3.3Vout Efficiency @ 25°C Ambient LMZ23605 3.3Vout Dissipation @ 25°C Ambient 100 8 DISSIPATION (W) EFFICIENCY (%) 90 80 70 60 8 Vin 12 Vin 20 Vin 24 Vin 30 Vin 36 Vin 50 40 0 2 36 Vin 30 Vin 24 Vin 20 Vin 12 Vin 8 Vin 7 1 2 3 4 OUTPUT CURRENT (A) 6 5 4 3 2 1 0 5 0 AN-2085 LMZ23605/03, LMZ22005/03 Evaluation Board Copyright © 2011–2013, Texas Instruments Incorporated 1 2 3 4 OUTPUT CURRENT (A) 5 SNVA457B – March 2011 – Revised April 2013 Submit Documentation Feedback Performance Characteristics www.ti.com LMZ23605 3.3Vout Efficiency @ 85°C LMZ23605 3.3Vout Dissipation @ 85°C 100 8 90 80 70 60 9 Vin 12 Vin 20 Vin 24 Vin 30 Vin 36 Vin 50 40 0 1 2 3 4 OUTPUT CURRENT (A) 6 DISSIPATION (W) EFFICIENCY (%) 36 Vin 30 Vin 24 Vin 20 Vin 12 Vin 9 Vin 7 5 4 3 2 1 0 5 0 LMZ23605 Load and Line Regulation @ 25°C Ambient 1 2 3 4 OUTPUT CURRENT (A) 5 LMZ23605 Current Limit VOUT = 3.3V 1.002 8 6 CURRENT (A) OUTPUT VOLTAGE (V) 7 1.001 1.000 9 Vin 12 Vin 20 Vin 24 Vin 30 Vin 36 Vin 0.999 0.998 0 Output Current 5 4 3 2 Input Current 1 1 2 3 4 OUTPUT CURRENT (A) 5 0 0 4 8 12 16 20 24 28 32 36 INPUT VOLTAGE (V) Output Ripple VOUT = 3.3V IOUT = 5A, BW to 20 MHz 10 mV/Div SNVA457B – March 2011 – Revised April 2013 Submit Documentation Feedback 500 ns/Div Output Ripple VOUT = 3.3V IOUT = 5A, BW to 250 MHz 10 mV/Div 500 ns/Div AN-2085 LMZ23605/03, LMZ22005/03 Evaluation Board Copyright © 2011–2013, Texas Instruments Incorporated 3 Notes www.ti.com LMZ23605 Load Step Response VIN = 12V VOUT = 3.3V, 0.5A to 5A Step 2A/Div 2A/Div 100 mV/Div 500 µs/Div LMZ23605 Start-up 4 LMZ23603 Load Step Response VIN = 12V VOUT = 3.3V, 0.5A to 3A Step 100 mV/Div 500 µs/Div LMZ23605 Pre-biased startup Notes Solder turrets are located on the edge of the PCB assembly for evaluation hookup to bench test equipment. The Enable input turret is designed for direct connection to the VIN turret. There is a resistive divider implemented on the board that establishes the 5.5V precision UVLO level of the board. A common user change to this divider is to raise the value of RENT to increase the operating UVLO to that of the target application. Refer to the respective data sheet for calculation. Note that if in the end application the module pin 3 enable voltage does not exceed 5.5V at maximum Vin, then enable clamp zener D1 can be omitted. Each implementation of the evaluation board is preset to 3.3V output; with current rating and maximum input voltage rating dictated by the model of module installed. A common user change is to adjust the output voltage for different requirements. A table of suggested resistor pairs are listed in Figure 1 for quick reference. Locations are provide for testing the operation as a coincident turn-on tracking supply (slave). To implement this feature, remove CSS and install Rtkt and Rtkb. Calculations are suggested in the respective data sheets. A turret is also provided for applying a clock to synchronize the module switching frequency anywhere between 650 kHz and 950 kHz. Note that a sustained “logic one” on this input corresponds to “zero hertz” and will cause the module to stop switching. J1 and J2 are for input and output noise measurement. To implement this feature, populate the 1uF blocking capacitors and the 49.9 ohm source resistors. Install Amphenol coax connectors type 112404 (Digikey #ACX1051).The added R-C network forms a 2X scope probe when used in conjunction with an input termination of 50 ohms at the oscilloscope, providing 5 times more sensitivity than a conventional 10x probe. J3 is for connection to a frequency response analyzer such as A/P Instruments (Ridley) or Venable Industries products. Refer to the FRA operating manual for this connection. Note: Do not place any type of shorting jumper to these three posts as that will cause a malfunction. 4 AN-2085 LMZ23605/03, LMZ22005/03 Evaluation Board Copyright © 2011–2013, Texas Instruments Incorporated SNVA457B – March 2011 – Revised April 2013 Submit Documentation Feedback PCB View and layout diagrams www.ti.com Inductor current can be monitored by connecting a loop of between module pin 7 (Vout) and the Co array. First cut the top side conducting etch between the two vias adjacent to pin 7, then install a 5” loop of 22 ga insulated wire in the two vias. Monitor the inductor sense loop with an AC/DC oscilloscope current probe. The Vin input plane has solder mask openings where an input LC network can be placed to accommodate improved differential mode and conducted EMI performance. Additional component mounting pads are available to experiment with alternative Cin and Cout combinations. See Figure 7 for corresponding schematic locations. 5 PCB View and layout diagrams Gerber and CAD files can be downloaded from the LMZ23605 /03, LMZ22005/03 respective product folders. Figure 2. Top View of Assembly SNVA457B – March 2011 – Revised April 2013 Submit Documentation Feedback AN-2085 LMZ23605/03, LMZ22005/03 Evaluation Board Copyright © 2011–2013, Texas Instruments Incorporated 5 PCB View and layout diagrams www.ti.com Figure 3. Top Layer Figure 4. Internal Layer I (Ground) Heat Sinking Layer 6 AN-2085 LMZ23605/03, LMZ22005/03 Evaluation Board Copyright © 2011–2013, Texas Instruments Incorporated SNVA457B – March 2011 – Revised April 2013 Submit Documentation Feedback PCB View and layout diagrams www.ti.com Figure 5. Internal Layer II (Ground and Routing) Heat Sinking Layer Figure 6. Bottom Layer (Ground) Heat Sinking Layer SNVA457B – March 2011 – Revised April 2013 Submit Documentation Feedback AN-2085 LMZ23605/03, LMZ22005/03 Evaluation Board Copyright © 2011–2013, Texas Instruments Incorporated 7 A 8 AN-2085 LMZ23605/03, LMZ22005/03 Evaluation Board Copyright © 2011–2013, Texas Instruments Incorporated D1 5.1V 0.2W Renb 12.7k Cin2 10 PF 50V Cin3 10 PF 50V 1.285V Rising Threshold Cin4 10 PF 50V DNP Rsn 1.50k Cin1 0.047 PF Renh 100 DNP Rff 2 J3 DNP 3 2 1 23.7 Rfbb 1.07k Rfra Rfbt DNP Cff TT11 3.32k TT8 CN1 1 PF 50V DNP Co1 0.047 PF Net-Tie NT1 EN Vin GND GND GND GND Vo Co2 100 PF 6.3V GND GND Co3 100 PF 6.3V DNP TT7 TT10 TT1 TT2 TT3 TT4 TT5 A B C D E F H J K L NT3 EC1 1 2 3 4 5 6 7 8 9 10 VOUT_S+ TRACK_OPT SYNC_OPT VOUT_SVIN_STEMPERATURE P_GOOD BIAS_OPT ENABLE OPT VIN_S+ NT5 NT2 Co5 220 PF 6.3V Co6 0.047 PF CN2 1 PF 50V DNP 1 J2 DNP GND Output Ripple Test Jack RN2 49.9 DNP Mates to EDAC 306-010-500-102 Digikey EDC306100 Quick Test Edge Connector V1 VOUT VOUT VOUT GND GND GND GND VIN VIN VIN Input Ripple Test Jack 2 3 4 5 NT4 Css 0.47 PF 16V X7R 0805 7 6 5 4 3 2 1 Rent 42.2k PGND/EP UVLO@5.5V TT6 Sync 8 VOUT SS FB AGND EN SYNC VIN Rtkb 107 DNP Rtkt 332 DNP TT9 VTrk GND U1 LMZ23605TZ GND RTD 100: @ 0- C Cin6 150 PF 50V 1 J1 DNP 2 3 4 5 GND Cin5 0.047 PF RN1 49.9 DNP PCB View and layout diagrams www.ti.com 1 DNP = Component not populated Figure 7. LMZ2360x / LMZ2200x PCB CAD Package Schematic SNVA457B – March 2011 – Revised April 2013 Submit Documentation Feedback PCB View and layout diagrams www.ti.com Table 1. Bill of Materials (1) (2) (1) (2) Designator Description Case Size Manufacturer Manufacturer P/N Quantit y U1 SIMPLE SWITCHER® TO-PMOD-7 Texas Instruments LMZ23605TZ or LMZ23603TZ or LMZ22005TZ or LMZ22003TZ 1 CIN1 CIN5 CO1 CO6 0.047 µF, X7R, 50V 1206 Yageo America CC1206KRX7R9BB473 4 CIN2 CIN3 10 µF, X5R, 50V 1210 Taiyo Yuden UMK325BJ106MM-T 2 CIN6 OPT 150 µF,Aluminum Electrolytic, 50V G Panasonic EEE-FK1H151P 1 CO2 OPT 100 µF, X5R, 6.3V 1210 CO5 220 µF, Specialty Polymer, 6.3V TDK C3225X5R0J107M 1 Panasonic EEF-UE0J221LR 1 CFF DNP CSS 0.47µF, X7R, 16V 0805 AVX 0805YC474KAT2A 1 D1 5.1V 200mW SOD-323 Diodes Inc. MMSZ5231BS-7-F 1 RENB 12.7 kΩ 0805 Panasonic ERJ-6ENF1272V 1 RENT 42.2 kΩ 0805 Panasonic ERJ-6ENF4222V 1 RENH 100 Ω 0805 Vishay-Dale CRCW0805100RFKEA 1 RFBT 3.32 kΩ 0805 Vishay-Dale CRCW08053K32FKEA 1 RFBB 1.07 kΩ 0805 Vishay-Dale CRCW08051K07FKEA 1 RFRA 23.7 Ω 0805 Vishay-Dale CRCW080523R7FKEA 1 0805 Vishay-Dale CRCW08051K50FKEA 1 RFF DNP RSN 1.50 kΩ VIN = 6V to 36V, VOUT = 3.3V, IOUT (MAX) = 5A (3A) Note: The same BOM applies to all implementations SNVA457B – March 2011 – Revised April 2013 Submit Documentation Feedback AN-2085 LMZ23605/03, LMZ22005/03 Evaluation Board Copyright © 2011–2013, Texas Instruments Incorporated 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. 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