LM5122EVM-2PH Evaluation Module User's Guide Literature Number: SNVU205 APRIL 2013
Contents 1 2 3 Introduction ........................................................................................................................ 4 Features and Electrical Performance ..................................................................................... 4 Test Points ......................................................................................................................... 4 4 Test Equipment 7 8 9 .........................................................................
www.ti.com List of Figures 1 Connection Diagram ........................................................................................................ 5 2 Efficiency ..................................................................................................................... 6 3 Load Transient 4 Interleaving................................................................................................................... 7 5 Pulse Skip ....................................................
User's Guide SNVU205 – APRIL 2013 LM5122EVM-2PH Evaluation Module 1 Introduction The LM5122EVM-2PH evaluation module (EVM) provides the design engineer with a fully functional dual phase synchronous boost converter to evaluate the Texas Instruments LM5122 synchronous boost controller device. The EVM provides 28 V output at up to 7 A current from a 9 V to 20 V input. The EVM is designed to start up from a single power supply without any additional bias voltage.
Test Equipment www.ti.com 4 Test Equipment 4.1 Power Supply Power Supply should be capable of 20 V / 25 A, current monitoring and remote sensing. 4.2 Electronic Load Electronic load should be capable of 32 V / 7 A. Use Constant Current (CC) mode. 4.3 Meters One current meter is required to measure input current accurately. Maximum current rating of the meter should be carefully considered. Input current can be as high as 25 A at full load current and minimum input voltage.
Performance Curves 5.2 www.ti.com Test Setup 5.2.1 Power Supply Connect the power supply’s positive terminal (+) to ‘A’ terminal of ampere meter and negative terminal (-) to TP4 GND. Connect the power supply’s positive remote sense terminal to TP2 VIN and negative remote sense terminal to TP4 GND. 5.2.2 Meter Connect ‘COM’ terminal of ampere meter to TP2 VIN. Double check ‘A’ terminal is connected to the power supply’s positive terminal. Voltage meter is used to measure output voltage.
Performance Curves www.ti.com 6.2 Load Transient VSUPPLY = 12 V, 3.5 A to 7 A and 7 A to 3.5 A load transient C1: VOUT Figure 3. Load Transient 6.3 Interleaving VSUPPLY = 12 V C1: SW1, C2: SW2 Figure 4.
Performance Curves 6.4 www.ti.com Light Load Operations Forced PWM (FPWM) and Skip Cycle mode can be configured by controlling MODE pin voltage. VSUPPLY = 12 V, ILOAD = 0 A C1:SW1 Figure 5. Pulse Skip C1: SW1 Figure 6. Skip Cycle C1: SW1 Figure 7.
Performance Curves www.ti.com 6.5 Startup VSUPPLY = 12 V, ILOAD = 0 A C1: VOUT, C2: SS, C4: VSUPPLY Figure 8. Startup Loop Response 40 180 GAIN [dB] 30 PHASE VSUPPLY = 12V ILOAD = 7.0A 135 20 90 10 45 0 0 -10 GAIN PHASE [°] 6.6 -45 -20 -90 -30 -135 -40 100 1000 10000 FREQUENCY [Hz] -180 100000 C002 Figure 9.
Schematic 7 www.ti.com Schematic Figure 10.
Schematic www.ti.com Figure 11.
Layout 8 www.ti.com Layout The LM5122 2-phase EVM has been designed using a 4-layer board. Most of components are on the top to allow the user to easily view, probe, and evaluate the LM5122 device. Figure 12. Top Silk (Top View) Figure 13.
Layout www.ti.com Figure 14. Top Copper (Top View) Figure 15.
Layout www.ti.com Figure 16. Mid2 Copper (X-Ray View) Figure 17.
Bill of Materials www.ti.com 9 Bill of Materials The EVM components are list according to the schematic shown in Figure 10 and Figure 11 . Table 3. Bill of Materials REFERENCE DESIGNATOR DESCRIPTION MANUFACTURER PART NUMBER QTY C1, C13 CAP, CER, 470 pF, 100 V, +/-5%, C0G, 0805 MURATA GRM2165C2A471JA01D 2 C2, C3, C12, C14, C15 CAP CER 3.
Bill of Materials 16 www.ti.
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