LMZ14202H

LMZ14203H/02H/01H Evaluation Board LMZ14203H/02H/01H Evaluation Board National Semiconductor Application Note 2089 Denislav D. Petkov January 7, 2011 Introduction The LMZ14203H/02H/01H SIMPLE SWITCHER® power modules for high output voltage are easy-to-use DC-DC solutions capable of driving up to a 3A load with exceptional power conversion efficiency, output voltage accuracy, line and load regulation. They are available in an innovative package that enhances thermal performance and allows for hand or machine soldering. The LMZ14203H/02H/01H Evaluation Board is configured for 12V output voltage from 15V to 42V input. The precision enable input allows for programmable UVLO of the input supply. The resistor voltage divider RENT and RENB set the input UVLO threshold. Connect the VIN turret terminal to the EN turret on the board to enable operation. The external soft-start capacitor CSS facilitates controlled startup output rise time. The resistors RFBT and R FBB set the output voltage. An output feed-forward capacitor CFF across the upper feedback resistor trims for optimum transient response. The control loop operates well with low ESR output capacitors such as ceramic and polymer electrolytic capacitors. The resistor RON sets the operating frequency. See datasheet for component selection details. The LMZ14203H/02H/01H PCB layout offers excellent thermal performance, achieving junction-to-ambient thermal resistance θJA of 14.9°C/W. The evaluation board with its default Bill of Materials offers great EMI performance, complying with the EN 55022 Class B radiated emissions standard. The solution also complies with the CISPR22 conducted emissions standard with the addition of a small input filter. Board Specifications • • • • • • • • • • • VIN = 15V to 42V VOUT = 12V 3A max load at 24VIN and 65°C TAMB Low radiated EMI (EN 55022 Class B compliant) 400kHz switching frequency Enable UVLO set at 13.5V θJA = 14.9°C/W 4 copper layers 2 oz copper on top and bottom layer 1 oz copper on internal layers 6.985 cm x 7.620 cm (2.75 in x 3 in) with 1.575 cm (.062 in) thickness of FR4 laminate material Additional Footprints Additional component mounting pads are available to experiment with alternative input and output capacitor combinations or a zener clamp on the enable input. See Figure 6 for corresponding schematic locations. AN-2089 30137701 FIGURE 1. Evaluation Board Schematic © 2011 National Semiconductor Corporation 301377 www.national.com AN-2089 TABLE 1. LMZ1420xH Bill of Materials, VIN = 15V to 42V, VOUT = 12V, IOUT (MAX) = 3A / 2A / 1A Designator U1 Description SIMPLE SWITCHER® Case Size TO-PMOD-7 Manufacturer National Semiconductor Taiyo Yuden Taiyo Yuden KEMET AVX AVX Panasonic Panasonic Vishay-Dale Panasonic Vishay-Dale Manufacturer P/N LMZ14203HTZ or LMZ14202HTZ or LMZ14201HTZ UMK316B7105KL-T UMK325BJ106MM-T T525D476M016ATE035 08051C223JAT2A 08053A472JAT2A ERJ-6ENF1182V ERJ-6ENF1243V CRCW080534K0FKEA ERJ-6ENF2431V CRCW0805249KFKEA Quantity 1 CIN4, CO1 CIN2 CO3 CFF CSS RENB RENT RFBT RFBB RON 1 µF, X7R, 50V 10 µF, X5R, 50V 47 µF, 35 mΩ, 16V, Polymer 0.022 µF, X7R, 100V 4700 pF, X7R, 25V 11.8 kΩ 124 kΩ 34 kΩ 2.43 kΩ 249 kΩ 1206 1210 7343-43 0805 0805 0805 0805 0805 0805 0805 2 1 1 1 1 1 1 1 1 1 www.national.com 2 AN-2089 Performance Characteristics Unless otherwise specified the following conditions apply: VIN = 24V, VOUT = 12V, TAMB = 25°C LMZ14203H Efficiency 100 95 EFFICIENCY (%) 90 85 80 75 70 0.0 VIN = 15V VIN = 24V VIN = 30V VIN = 36V VIN = 42V 0.5 1.0 1.5 2.0 2.5 OUTPUT CURRENT (A) 3.0 30137739 LMZ14203H Thermal Derating 3.5 3.0 OUTPUT CURRENT (A) 2.5 2.0 1.5 1.0 0.5 0.0 -20 VIN = 15V VIN = 24V VIN = 42V 0 20 40 60 80 100 120 140 AMBIENT TEMPERATURE (°C) 30137740 LMZ14202H Efficiency 100 95 EFFICIENCY (%) 90 85 80 75 70 0.0 VIN = 15V VIN = 24V VIN = 30V VIN = 36V VIN = 42V 0.5 1.0 1.5 OUTPUT CURRENT (A) 2.0 30137742 LMZ14202H Thermal Derating 2.5 2.0 1.5 1.0 0.5 0.0 -20 OUTPUT CURRENT (A) VIN = 15V VIN = 24V VIN = 42V 0 20 40 60 80 100 120 140 AMBIENT TEMPERATURE (°C) 30137743 LMZ14201H Efficiency 100 95 EFFICIENCY (%) 90 85 80 75 70 0.0 VIN = 15V VIN = 24V VIN = 30V VIN = 36V VIN = 42V 0.2 0.4 0.6 0.8 OUTPUT CURRENT (A) 1.0 30137745 LMZ14201H Thermal Derating 1.2 1.0 0.8 0.6 0.4 0.2 0.0 -20 VIN = 15V VIN = 24V VIN = 42V 0 20 40 60 80 100 120 140 AMBIENT TEMPERATURE (°C) 30137746 3 OUTPUT CURRENT (A) www.national.com AN-2089 LMZ14203H Startup LMZ14203H Line and Load Regulation 12.6 12.4 12.2 12.0 11.8 11.6 30137734 OUTPUT VOLTAGE (V) VIN = 15V VIN = 24V VIN = 30V VIN = 36V VIN = 42V ±1% 0.0 0.5 1.0 1.5 2.0 2.5 OUTPUT CURRENT (A) 3.0 30137738 LMZ14203H Transient Response 30% to 100% Load Step DC CURRENT LIMIT LEVEL (A) LMZ14203H Current Limit 6.0 5.5 5.0 4.5 4.0 3.5 3.0 Fsw = 250kHz Fsw = 400kHz Fsw = 600kHz 5 10 15 20 25 30 35 INPUT VOLTAGE (V) 40 45 30137741 30137718 LMZ14202H Current Limit 4.5 DC CURRENT LIMIT LEVEL (A) 4.0 3.5 3.0 2.5 2.0 5 10 15 20 25 30 35 INPUT VOLTAGE (V) 40 45 30137744 LMZ14201H Current Limit 3.5 DC CURRENT LIMIT LEVEL (A) 3.0 2.5 2.0 1.5 1.0 5 10 15 20 25 30 35 INPUT VOLTAGE (V) 40 45 30137747 Fsw = 250kHz Fsw = 400kHz Fsw = 600kHz Fsw = 250kHz Fsw = 400kHz Fsw = 600kHz www.national.com 4 AN-2089 LMZ14203H Radiated EMI, IOUT = 3A 80 RADIATED EMISSIONS (dBμV/m) 70 60 50 40 30 20 10 0 0 200 400 600 800 FREQUENCY (MHz) 1000 30137748 LMZ14203H Conducted EMI, IOUT = 3A with 3.3µH 2x10µF LC line filter added 80 CONDUCTED EMISSIONS (dBμV) 70 60 50 40 30 20 10 0 0.1 1 10 FREQUENCY (MHz) 100 30137751 Radiated Emissions EN 55022 Limit (Class B) Conducted Emissions CISPR 22 Quasi Peak CISPR 22 Average LMZ14202H Radiated EMI, IOUT = 2A 80 RADIATED EMISSIONS (dBμV/m) 70 60 50 40 30 20 10 0 0 200 400 600 800 FREQUENCY (MHz) 1000 30137749 LMZ14202H Conducted EMI, IOUT = 2A with 3.3µH 2x10µF LC line filter added 80 CONDUCTED EMISSIONS (dBμV) 70 60 50 40 30 20 10 0 0.1 1 10 FREQUENCY (MHz) 100 30137752 Radiated Emissions EN 55022 Limit (Class B) Conducted Emissions CISPR 22 Quasi Peak CISPR 22 Average LMZ14201H Radiated EMI, IOUT = 1A 80 RADIATED EMISSIONS (dBμV/m) 70 60 50 40 30 20 10 0 0 200 400 600 800 FREQUENCY (MHz) 1000 30137750 LMZ14201H Conducted EMI, IOUT = 1A with 3.3µH 1µF LC line filter added 80 CONDUCTED EMISSIONS (dBμV) 70 60 50 40 30 20 10 0 0.1 1 10 FREQUENCY (MHz) 100 30137753 Radiated Emissions EN 55022 Limit (Class B) Conducted Emissions CISPR 22 Quasi Peak CISPR 22 Average 5 www.national.com AN-2089 PCB Layout Diagrams Gerber and CAD files can be download from the LMZ14203H product folder. 30137709 FIGURE 2. Top Layer 30137710 FIGURE 3. Internal Layer I (Ground) Heat Sinking Layer www.national.com 6 AN-2089 30137711 FIGURE 4. Internal Layer II (Ground) Heat Sinking Layer 30137712 FIGURE 5. Bottom Layer (Ground and Routing) Heat Sinking Layer 7 www.national.com AN-2089 PCB Schematic 30137713 FIGURE 6. Detailed Schematic DNS = Component not installed 30137754 FIGURE 7. 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