TPS65287EVM

User's Guide SLVU896A – May 2013 – Revised May 2013 TPS65287 High Current, Synchronous Step Down Three Buck Switcher Evaluation Module with One USB Switch This document presents the information required to power the TPS65287 PMIC as well as the support documentation including schematic and bill of materials. 1 2 3 4 5 6 Contents Background .................................................................................................................. Schematic .................................................................................................................... Board Layout ................................................................................................................ 3.1 EVM Layout ......................................................................................................... Bench Test Setup Conditions ............................................................................................. 4.1 Jumpers and Switches ............................................................................................ 4.2 Test Points and Placement ....................................................................................... Power-Up Procedure ....................................................................................................... Bill of Materials .............................................................................................................. 2 2 4 5 6 6 7 7 8 List of Figures 1 TPS65287 Schematic ...................................................................................................... 3 2 Placement 3 4 5 6 7 ................................................................................................................... Board Layout (Top Layer).................................................................................................. Board Layout (Middle 2nd) Layer .......................................................................................... Board Layout (Middle 3rd) Layer ........................................................................................... Board Layout (Bottom Layer) .............................................................................................. Headers Description and Jumper Placement ........................................................................... SLVU896A – May 2013 – Revised May 2013 Submit Documentation Feedback TPS65287 High Current, Synchronous Step Down Three Buck Switcher Evaluation Module with One USB Switch Copyright © 2013, Texas Instruments Incorporated 4 5 5 5 5 6 1 Background 1 www.ti.com Background The TPS65287 PMIC is designed to provide 3, 2 and 2 A continuous outputs with an operational range of 4.5 to 18V and a externally set switching frequency ranging from 300kHz to 2.2MHz, with automatic PFM/PWM operation. When the PMIC is not fully load, buck1 can be loaded to 3.5A and buck 2 and 3 to 2.5A. The device also features one USB distribution switch. As there are many possible options to set the converters, Table 1 presents the performance specification summary for the EVM. Table 1. Input Voltage and Output Current Summary EVM Test Conditions Output Current Range TPS65287EVM Vin = 4.5 V to 18 V Fsw = 500 kHz Buck1, 1.2V, 3A Buck2, 1.8V, 2A Buck3, 3.3V, 2A (25°C ambient) This evaluation module is designed to provide access to the features of the TPS65287. Some modifications can be made to this module to test performance at different input and output voltages, current and frequency operation. Contact TI Field Applications Group for advice on these matters. 2 Schematic The resistor and capacitor values have been chosen according to the guidelines presented on the TPS65287 spec. Note that for the purpose of gains-phase measurements R14, R17 and R37 (zero ohm on the EVM) need to be replaced by suitable low value resistors as per the network analyzer setup required. Test points connections are provided on either end of the resistors to allow for easy measurement. (See next page) 2 TPS65287 High Current, Synchronous Step Down Three Buck Switcher Evaluation Module with One USB Switch Copyright © 2013, Texas Instruments Incorporated SLVU896A – May 2013 – Revised May 2013 Submit Documentation Feedback Schematic www.ti.com Figure 1. TPS65287 Schematic SLVU896A – May 2013 – Revised May 2013 Submit Documentation Feedback TPS65287 High Current, Synchronous Step Down Three Buck Switcher Evaluation Module with One USB Switch Copyright © 2013, Texas Instruments Incorporated 3 Board Layout 3 www.ti.com Board Layout Figure 2. Placement 4 TPS65287 High Current, Synchronous Step Down Three Buck Switcher Evaluation Module with One USB Switch Copyright © 2013, Texas Instruments Incorporated SLVU896A – May 2013 – Revised May 2013 Submit Documentation Feedback Board Layout www.ti.com 3.1 EVM Layout Figure 3. Board Layout (Top Layer) Figure 4. Board Layout (Middle 2nd) Layer Figure 5. Board Layout (Middle 3rd) Layer Figure 6. Board Layout (Bottom Layer) SLVU896A – May 2013 – Revised May 2013 Submit Documentation Feedback TPS65287 High Current, Synchronous Step Down Three Buck Switcher Evaluation Module with One USB Switch Copyright © 2013, Texas Instruments Incorporated 5 Bench Test Setup Conditions 4 www.ti.com Bench Test Setup Conditions Vin 4.5V – 18V + N W E S Vout_1 + + Vout 3 USB_FAULT USB_out Vout 2 + USB_in EN B1 EN B2 EN B3 EN_USB FORCED PWM PGOOD RSET INT Figure 7. Headers Description and Jumper Placement 4.1 Jumpers and Switches Number 6 Function LOC Placement Comment JP11 BUCK1 enable (EN1) SW For immediate start-up fit jumper to V3V For sequencing do not fit jumper To disable converter fit jumper to GND Fit according to test requirement JP20 BUCK2 enable (EN2) SW For immediate start-up fit jumper to V3V For sequencing do not fit jumper To disable converter fit jumper to GND Fit according to test requirement JP3 BUCK3 enable (EN3) SW For immediate start-up fit jumper to V3V For sequencing do not fit jumper To disable converter fit jumper to GND Fit according to test requirement TPS65287 High Current, Synchronous Step Down Three Buck Switcher Evaluation Module with One USB Switch Copyright © 2013, Texas Instruments Incorporated SLVU896A – May 2013 – Revised May 2013 Submit Documentation Feedback Power-Up Procedure www.ti.com Number 4.2 Function LOC Placement Comment For forced PWM operation fit jumper to V3V For automatic PFM/PWM operation fit jumper to GND Do not leave this header open. Use a jumper to set either forced PWM mode or automatic PFM/PWM mode For automatic start-up fit jumper to V3V To disable SWITCH fit jumper to GND Fit according to test requirement USB fault indicator pulled to 3V3 Fit according to test requirement NE For internal set fit jumper to GND For external R set fit jumper to resistor Fit according to test requirement JP25 Forced PWM (F_PWM) S JP34 USB enable (USB1EN) SW JP35 USB_nFAULT E JP30 USB ILIMIT SET JP26 INT S BUCK interrupt indicator pulled to 3V3 Fit according to test requirement JP27 PGOOD S PGOOD indicated pulled to 3V3 Fit according to test requirement Test Points and Placement Buck converter outputs are white and have a label for easy location. Close to any of these test points there are black ground test points to allow for DVM measurement or to use a metal exposed scope probe to reduce common mode noise measurements. All test points are described in the following table: TP Name Signal Color TP1 GND GND Black TP2 GND GND Black TP3 GND GND Black TP4 Vin Vin White TP5 GND GND Black TP6 GND GND Black TP7 GND GND Black TP14 Vout1 Output voltage Buck1 Not fitted Injection Point gain-phase measurement buck1 Not fitted Output voltage Buck2 Not fitted Injection Point gain-phase measurement buck2 Not fitted Output voltage Buck3 Not fitted Injection Point gain-phase measurement buck3 Not fitted TP14a TP17 Vout1 TP17a TP37 Vout1 TP37a 5 TP32 USB1_Vin USB1 switch input White TP33 USB1_Vo USB1 switch output White Comment Normally not used Normally not used Normally not used Power-Up Procedure 1. Define which converters are to be enabled or disabled by connecting jumpers to JP3, JP11 and JP20 accordingly, or to wiring external drive signals to the ENx headers. 2. If PGOOD signal is required connect JP27 or wire the PGOOD pin to a pull-up supply. 3. Define the strategy to enable the USB switch, either with jumpers or external drive signals to the USBEN pin. 4. If USB_nFAULT signal is required connect J35 jumper or wire the alarms pin to a pull-up supply. 5. Connect loads to the output connectors. 6. Apply a DC voltage to header J3. Polarity is marked on the silk-screen. 7. Converters will start according to the setting on JP3, JP11 and JP20. Check the outputs. 8. To power the USB switch apply a DC voltage to JP4. Enable the switch with JP34. Check the outputs. SLVU896A – May 2013 – Revised May 2013 Submit Documentation Feedback TPS65287 High Current, Synchronous Step Down Three Buck Switcher Evaluation Module with One USB Switch Copyright © 2013, Texas Instruments Incorporated 7 Bill of Materials 6 Bill of Materials Qty 8 www.ti.com Designator Value Footprint Description 1 C1 22uF 1812 CAP CERAMIC 22UF 25V X5R 1210 Comment 12 C2, C3, C8a, C9, C11, C14a, C17b, C20, C22, C23, C37a, C40 4.7nF 0603 CAP 4700PF 50V CERAMIC X7R 0603 3 C3a, C8, C23a 3 C12, C19, C39 47nF 0603 CAP 47000PF 25V CERM X7R 0603 1 C5 0.1uF 0603 CAP 100nF 25V CERM X7R 0603 3 C13, C18, C38 10uF 1206 CAP CERAMIC 10UF 25V X5R 1206 2 C14, C17, 47uF 1210 CAP CERAMIC 22UF 25V X5R 1210 1 C37 22uF 1210 CAP CERAMIC 22UF 25V X5R 1210 3 C28, C32, C33 10uF 0805 CAP CER 10UF 10V X7R 0805 1 C29 4.7uF 0603 CAP CER 4.7UF 10V X5R 0603 2 C32a, C33a CAP_POL_1210 CAPACITOR TANT 100UF 10V 20% SMD 5 J1, J2, J3, J6 ED555/2DS TB_2X3.5MM TERMINAL BLOCK 3.5MM 2POS PCB 1 J4 ED555/3DS TB_3X3.5MM TERMINAL BLOCK 3.5MM 2POS PCB 7 JP3, JP5, JP11, JP20, JP25, JP34,JP30 JMP0.3 CONN HEADER 50POS .100" SGL GOLD 3 JP26, JP27, JP35 JMP0.2 CONN HEADER 50POS .100" SGL GOLD 3 L1, L2, L3 4.7uH IND_RLF7030 Magnetic-Core Inductor 1 R21 120K 0603 RES 120K OHM 1/10W 5% 0603 SMD 2 R1, R10 82K 0603 RES 82K OHM 1/10W 1% 0603 SMD 3 R3, R8, R23 20K 0603 RES 20K OHM 1/10W 5% 0603 SMD 1 R6 383K 0603 RES 383K OHM 1/10W 1% 0603 SMD 4 R5b, R26, R27, R35 100K 0603 RES 100K OHM 1/10W 5% 0603 SMD 5 R5a, R14, R17, R20, R37 0 0603 RES 0.0 OHM 1/10W 5% 0603 SMD 3 R14a, R17a, R37a 40.2K 0603 RES 40.2K OHM 1/10W 1% 0603 SMD 1 R14b 80.6K 0603 RES 80.6K OHM 1/10W 1% 0603 SMD 1 R17b 32.4K 0603 RES 32.4K OHM 1/10W 1% 0603 SMD 1 R37b 12.7K 0603 RES 12.7K OHM 1/10W 1% 0603 SMD 1 R30 25k 0603 RES 25.0K OHM 1/10W 1% 0603 SMD 1 S5 7914J SWITCH KEY 4MM SQ SMD J-HOOK 6 TP1, TP2, TP3, TP5, TP6, TP7 TEST POINT 0.052 Glass Beaded Test Point 6 TP4, TP14, TP17, TP32, TP33, TP37 TEST POINT 0.052 Glass Beaded Test Point 3 TP17a, TP37a, TP14a TEST POINT 0.052 Test Point, O.032 Hole 1 U1 QFN-40 TPS65287 0603 DNI DNI TPS65287 High Current, Synchronous Step Down Three Buck Switcher Evaluation Module with One USB Switch Copyright © 2013, Texas Instruments Incorporated DNI DNI SLVU896A – May 2013 – Revised May 2013 Submit Documentation Feedback 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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