TPS5431EVM-173

www.ti.com Table of Contents User’s Guide TPS5430 and TPS5431 Step-Down Converter Evaluation Module User's Guide Table of Contents 1 Introduction.............................................................................................................................................................................2 1.1 Background........................................................................................................................................................................ 2 1.2 Performance Specification Summary.................................................................................................................................2 1.3 Modifications...................................................................................................................................................................... 3 2 Test Setup and Results.......................................................................................................................................................... 3 2.1 Input/Output Connections.................................................................................................................................................. 3 2.2 Efficiency............................................................................................................................................................................4 2.3 Output Voltage Load Regulation........................................................................................................................................ 5 2.4 Output voltage Line Regulation..........................................................................................................................................6 2.5 Load Transients..................................................................................................................................................................7 2.6 Loop Characteristics.......................................................................................................................................................... 8 2.7 Output Voltage Ripple........................................................................................................................................................ 9 2.8 Input Voltage Ripple......................................................................................................................................................... 10 2.9 Powering Up.....................................................................................................................................................................11 3 Board Layout.........................................................................................................................................................................12 3.1 Layout.............................................................................................................................................................................. 12 4 Schematic and Bill of Materials...........................................................................................................................................14 4.1 Schematic........................................................................................................................................................................ 14 4.2 Bill of Materials.................................................................................................................................................................16 5 Revision History................................................................................................................................................................... 16 List of Figures Figure 2-1. TPS5430 Efficiency................................................................................................................................................... 4 Figure 2-2. TPS5431 Efficiency................................................................................................................................................... 5 Figure 2-3. TPS5430 Load Regulation........................................................................................................................................ 5 Figure 2-4. TPS5431 Load Regulation........................................................................................................................................ 6 Figure 2-5. TPS5430 Line Regulation......................................................................................................................................... 6 Figure 2-6. TPS5431 Line Regulation......................................................................................................................................... 7 Figure 2-7. PS5430 Transient Response.....................................................................................................................................7 Figure 2-8. TPS5431 Transient Response.................................................................................................................................. 8 Figure 2-9. TPS5430 Loop Response......................................................................................................................................... 8 Figure 2-10. PS5431 Loop Response......................................................................................................................................... 9 Figure 2-11. TPS5430 Output Ripple...........................................................................................................................................9 Figure 2-12. PS5431 Output Ripple...........................................................................................................................................10 Figure 2-13. TPS5430 Input Ripple........................................................................................................................................... 10 Figure 2-14. TPS5431 Input Ripple............................................................................................................................................11 Figure 2-15. TPS5430 and TPS5431 Start-Up.......................................................................................................................... 11 Figure 3-1. Top-Side Layout...................................................................................................................................................... 12 Figure 3-2. Bottom-Side Layout (Looking From Top Side)........................................................................................................ 13 Figure 3-3. Top-Side Assembly..................................................................................................................................................13 Figure 4-1. TPS5430EVM-173 Schematic.................................................................................................................................15 List of Tables Table 1-1. Input Voltage and Output Current Summary...............................................................................................................2 Table 1-2. TPS5430EVM-173 and TPS5431EVM-173 Performance Specification Summary.....................................................2 Table 1-3. Output Voltages Available...........................................................................................................................................3 Table 2-1. EVM Connectors and Test Points............................................................................................................................... 4 Table 4-1. TPS5430EVM-173 Bill of Materials...........................................................................................................................16 SLVU157A – MARCH 2006 – REVISED OCTOBER 2021 TPS5430 and TPS5431 Step-Down Converter Evaluation Module User's Submit Document Feedback Guide Copyright © 2021 Texas Instruments Incorporated 1 Trademarks www.ti.com Trademarks PowerPAD™ is a trademark of Texas Instruments. All trademarks are the property of their respective owners. 1 Introduction This user's guide contains background information for the TPS5430 and TPS5431 as well as support documentation for the TPS5430EVM-173 evaluation module (HPA173-001) and the TPS5431EVM-173 evaluation module (HPA173-002) . Also included are the performance specifications, the schematic, and the bill of materials for the TPS5430EVM-173 and the TPS5431EVM-173. 1.1 Background The TPS5430 and TPS5431 dc/dc converters are designed to provide up to a 3-A output from an input voltage source of 5.5 V to 36 V (TPS5430) or 5.5 V to 23 V (TPS5431EVM-173). Rated input voltage and output current range for the evaluation module is given in Table 1-1. This evaluation module is designed to demonstrate the small printed-circuit-board areas that may be achieved when designing with the TPS5430 and TPS5431 regulators. The switching frequency is internally set at a nominal 500 kHz. The high-side MOSFET is incorporated inside the TPS5430/31 package along with the gate drive circuitry. The low drain-to-source on resistance of the MOSFET allows the TPS5430/31 to achieve high efficiencies and helps keep the junction temperature low at high output currents. The compensation components are provided internal to the integrated circuit (IC), whereas an external divider allows for an adjustable output voltage. Additionally, the TPS5430/31 provides an enable input. The absolute maximum input voltage is 38 V for the TPS5430EVM-173 and 25 V for the TPS5431EVM-173 . Table 1-1. Input Voltage and Output Current Summary EVM INPUT VOLTAGE RANGE OUTPUT CURRENT RANGE TPS5430EVM-173 VIN = 10 V to 35 V 0 A to 3 A TPS5431EVM-173 VIN = 9 V to 21 V 0 A to 3 A 1.2 Performance Specification Summary A summary of the TPS5430EVM-173 performance specifications is provided in Table 1-2. Specifications are given for an input voltage of VIN = 15 V and an output voltage of 5 V, unless otherwise specified. The TPS5430EVM-173 is designed and tested for VIN = 10 V to 35 V. The ambient temperature is 25°C for all measurements, unless otherwise noted. Table 1-2. TPS5430EVM-173 and TPS5431EVM-173 Performance Specification Summary SPECIFICATION VIN voltage range MIN TYP MAX TPS5430EVM-173 TEST CONDITIONS 10 15 35 TPS5431EVM-173 9 15 21 Output voltage set point 5.0 Output current range Line regulation Load regulation VIN = 3.3 V ±0.07% TPS5431EVM-173 IO = 0 A – 3 A, VIN = 9 V – 21 V ±0.04% TPS5430EVM-173 TPS5431EVM-173 VIN = 15 V, IO = 0 A to 3 A IO = 0.75 A to 2.25 A TPS5431EVM-173 Load transient response TPS5430EVM-173 IO = 2.25 A to 0.75 A TPS5431EVM-173 V V 3 IO = 0 A – 3 A, VIN = 10 V – 35 V TPS5430EVM-173 2 0 TPS5430EVM-173 UNIT A ±0.03% ±0.05% Voltage change –50 mV Recovery time 150 μs Voltage change –40 mV Recovery time 150 μs Voltage change 50 mV Recovery time 150 μs Voltage change 40 mV Recovery time 150 μs TPS5430 and TPS5431 Step-Down Converter Evaluation Module User's SLVU157A – MARCH 2006 – REVISED OCTOBER 2021 Guide Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated www.ti.com Introduction Table 1-2. TPS5430EVM-173 and TPS5431EVM-173 Performance Specification Summary (continued) SPECIFICATION Loop bandwidth Phase margin TEST CONDITIONS VIN = 25 V, IO = 1 A 25.0 TPS5431EVM-173 VIN = 15 V, IO = 1 A 23.9 TPS5430EVM-173 VIN = 25 V , IO = 1 A 50° TPS5431EVM-173 VIN = 15 V, IO = 1 A 51° TPS5431EVM-173 TPS5430EVM-173 Output ripple voltage TPS5431EVM-173 IO = 3 A UNIT kHz 300 295 350 20 Operating frequency MAX 255 20 IO = 3 A Output rise time Max efficiency TYP TPS5430EVM-173 TPS5430EVM-173 Input ripple voltage MIN mVpp mVpp 8 ms 500 kHz TPS5430EVM-173 VIN = 10 V, VO = 5 V, IO = 0.75 A 93.6% TPS5431EVM-173 VIN = 9 V, VO = 5 V, IO = 0.75 A 94.0% 1.3 Modifications These evaluation modules are designed to demonstrate the small size that can be attained when designing with the TPS5430 and TPS5431. A few changes can be made to this module. 1.3.1 Output Voltage Set Point To change the output voltage of the EVMs, it is necessary to change the value of resistor R2. Changing the value of R2 can change the output voltage above 1.25 V. The value of R2 for a specific output voltage can be calculated using Equation 1. R2 + 10 kW V 1.221 V * 1.221 V O (1) Table 1-3 lists the R2 values for some common output voltages. Note that VIN must be in a range so that the minimum on-time is greater than 200 ns, and the maximum duty cycle is less than 87%. The values given in Table 1-3 are standard values, not the exact value calculated using Equation 1. Table 1-3. Output Voltages Available Output Voltage (V) R2 Value (kΩ) 1.8 21.5 2.5 9.53 3.3 5.90 5 3.24 2 Test Setup and Results This section describes how to properly connect, set up, and use the TPS5430EVM-173 and TPS5431EVM-173 evaluation modules. The section also includes test results typical for the evaluation modules and covers efficiency, output voltage regulation, load transients, loop response, output ripple, input ripple, and startup. 2.1 Input/Output Connections The TPS5430EVM-173 and TPS5431EVM-173 are provided with input/output connectors and test points as shown in Table 2-1. A power supply capable of supplying 3 A must be connected to J1 through a pair of 20 AWG wires. The load must be connected to J3 through a pair of 20 AWG wires. The maximum load current capability should be 3 A. Wire lengths must be minimized to reduce losses in the wires. Test-point TP1 provides a place to monitor the VIN input voltages with TP2 providing a convenient ground reference. TP3 is used to monitor the output voltage with TP4 as the ground reference. SLVU157A – MARCH 2006 – REVISED OCTOBER 2021 TPS5430 and TPS5431 Step-Down Converter Evaluation Module User's Submit Document Feedback Guide Copyright © 2021 Texas Instruments Incorporated 3 Test Setup and Results www.ti.com Table 2-1. EVM Connectors and Test Points Reference Designator Function J1 VIN (see Table 1-1 for Vin range) J2 OUT, 5 V at 3 A maximum JP1 2-pin header for enable. Connect EN to ground to disable, open to enable. TP1 VIN test point at VIN connector TP2 GND test point at VIN TP3 Output voltage test point at OUT connector TP4 GND test point at OUT connector TP5 Test point between voltage divider network and R3. Used for loop response measurements. TP6 PH test point 2.2 Efficiency The efficiency for both EVMs peak at a load current of about 0.75 A and then decrease as the load current increases towards full load. Figure 2-1 shows the efficiency for the TPS5430EVM-173 at an ambient temperature of 25°C. EFFICIENCY vs OUTPUT CURRENT 100 VIN = 10 V VIN = 15 V Efficiency - % 95 VIN = 20 V VIN = 25 V 90 VIN = 30 V 85 VIN = 35 V 80 75 0 0.5 1 1.5 2 2.5 IO - Output Current - A 3 3.5 Figure 2-1. TPS5430 Efficiency Figure 2-2 shows the efficiency for the TPS5431EVM-173 at an ambient temperature of 25°C. 4 TPS5430 and TPS5431 Step-Down Converter Evaluation Module User's SLVU157A – MARCH 2006 – REVISED OCTOBER 2021 Guide Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated www.ti.com Test Setup and Results EFFICIENCY vs OUTPUT CURRENT 100 VIN = 9 V VIN = 12 V Efficiency - % 95 VIN = 15 V 90 VIN = 18 V VIN = 21 V 85 80 75 0 0.5 1 1.5 2 2.5 IO - Output Current - A 3 3.5 Figure 2-2. TPS5431 Efficiency The efficiency is lower at higher ambient temperatures, due to temperature variation in the drain-to-source resistance of the MOSFETs. 2.3 Output Voltage Load Regulation The load regulation for the TPS5430EVM-173 and TPS5431EVM-173 are shown in Figure 2-3 and Figure 2-4. LOAD REGULATION vs OUTPUT CURRENT 0.1 0.08 Output Regulation - % 0.06 0.04 0.02 0 -0.02 -0.04 -0.06 -0.08 -0.1 0 0.5 1 1.5 2 IO - Output Current - A 2.5 3 Figure 2-3. TPS5430 Load Regulation SLVU157A – MARCH 2006 – REVISED OCTOBER 2021 TPS5430 and TPS5431 Step-Down Converter Evaluation Module User's Submit Document Feedback Guide Copyright © 2021 Texas Instruments Incorporated 5 Test Setup and Results www.ti.com LOAD REGULATION vs OUTPUT CURRENT 0.1 0.08 Output Regulation - % 0.06 0.04 0.02 0 -0.02 -0.04 -0.06 -0.08 -0.1 0 0.5 1 1.5 2 IO - Output Current - A 2.5 3 Figure 2-4. TPS5431 Load Regulation Measurements are given for an ambient temperature of 25°C. 2.4 Output voltage Line Regulation The load regulation for the TPS5430EVM-173 and TPS54310EVM-173 are shown in Figure 2-5 and Figure 2-6. LINE REGULATION vs INPUT VOLTAGE 0.1 0.08 Output Regulation - % 0.06 IO = 0 A 0.04 0.02 IO = 3 A 0 IO = 1.5 A -0.02 -0.04 -0.06 -0.08 -0.1 10 15 20 25 VI - Input Voltage - V 30 35 Figure 2-5. TPS5430 Line Regulation 6 TPS5430 and TPS5431 Step-Down Converter Evaluation Module User's SLVU157A – MARCH 2006 – REVISED OCTOBER 2021 Guide Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated www.ti.com Test Setup and Results LINE REGULATION vs INPUT VOLTAGE 0.1 0.08 Output Regulation - % 0.06 IO = 0 A 0.04 0.02 IO = 1.5 A 0 -0.02 IO = 3 A -0.04 -0.06 -0.08 -0.1 9 12 15 18 VI - Input Voltage - V 21 Figure 2-6. TPS5431 Line Regulation 2.5 Load Transients The TPS5430EVM-173 and TPS5431EVM-173 response to load transients is shown in Figure 2-7 and Figure 2-8. The current step is from 25% to 75% of maximum rated load. Total peak-to-peak voltage variation is as shown, including ripple and noise on the output. VOUT = 50 mV /Div (AC-Coupled) IOUT = 1 A/Div Time = 200 µs/Div Figure 2-7. PS5430 Transient Response SLVU157A – MARCH 2006 – REVISED OCTOBER 2021 TPS5430 and TPS5431 Step-Down Converter Evaluation Module User's Submit Document Feedback Guide Copyright © 2021 Texas Instruments Incorporated 7 Test Setup and Results www.ti.com VOUT = 50 mV/Div (AC-Coupled) IOUT = 1 A/Div Time = 200 µs/Div Figure 2-8. TPS5431 Transient Response 2.6 Loop Characteristics The TPS5430EVM-173 and TPS5431EVM-173 loop-response characteristics are shown in Figure 2-9 and Figure 2-10. Gain and phase plots are shown for VIN voltage of 25 V for the TPS5430EVM-173 and 15 V for the TPS5431EVM-173. Load current for both measurements is 1 A. 60 180 Phase Gain - dB Phase - deg Gain -60 100 f - Frequency - Hz -180 1M Figure 2-9. TPS5430 Loop Response 8 TPS5430 and TPS5431 Step-Down Converter Evaluation Module User's SLVU157A – MARCH 2006 – REVISED OCTOBER 2021 Guide Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated www.ti.com Test Setup and Results 60 180 Gain -60 100 Phase - deg Gain - dB Phase -180 1M f - Frequency - Hz Figure 2-10. PS5431 Loop Response 2.7 Output Voltage Ripple The TPS5430EVM-173 and TPS5431EVM-173 output voltage ripple is shown in Figure 2-11 and Figure 2-12 . The output current is the rated full load of 3 A. Voltage is measured directly across output capacitors. VOUT = 20 mV/Div (AC-Coupled) VP = 20 V/Div Time = 1 µs/Div Figure 2-11. TPS5430 Output Ripple SLVU157A – MARCH 2006 – REVISED OCTOBER 2021 TPS5430 and TPS5431 Step-Down Converter Evaluation Module User's Submit Document Feedback Guide Copyright © 2021 Texas Instruments Incorporated 9 Test Setup and Results www.ti.com VOUT = 20 mV/Div (AC-Coupled) VPH = 10 V/Div Time = 1 µs/Div Figure 2-12. PS5431 Output Ripple 2.8 Input Voltage Ripple The TPS5430EVM-173 and TPS5431EVM-173 input voltage ripple is shown in Figure 2-13 and Figure 2-14. The output current for each device is at full rated load of 3 A. VIN = 100 mV/Div (AC-Coupled) VPH = 20 V/Div Time = 1 µs/Div Figure 2-13. TPS5430 Input Ripple 10 TPS5430 and TPS5431 Step-Down Converter Evaluation Module User's SLVU157A – MARCH 2006 – REVISED OCTOBER 2021 Guide Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated www.ti.com Test Setup and Results VIN = 100 mV/Div (AC-Coupled) VPH = 10 V/Div Time = 1 µs/Div Figure 2-14. TPS5431 Input Ripple 2.9 Powering Up The start-up waveform is shown in Figure 2-15. The top trace shows ENA, and the bottom trace shows Vout. Initially, the output is inhibited by using a jumper at JP1 to tie EN to GND. When the jumper is removed, ENA is released. When the ENA voltage reaches the enable-threshold voltage of 1.06 V, the start-up sequence begins and the internal reference voltage begins to ramp up at the internally set rate towards 1.221 V and the output voltage ramps up to the externally set value of 5 V. The start-up waveform is the same for both the TPS5430EVM-173 and the TPS5431EVM-173. ENA = 2 V/Div VOUT = 2 V/Div Time = 2 ms/Div Figure 2-15. TPS5430 and TPS5431 Start-Up SLVU157A – MARCH 2006 – REVISED OCTOBER 2021 TPS5430 and TPS5431 Step-Down Converter Evaluation Module User's Submit Document Feedback Guide Copyright © 2021 Texas Instruments Incorporated 11 Board Layout www.ti.com 3 Board Layout This section provides a description of the TPS5430EVM-173 and TPS5431EVM-173 board layout and layer illustrations. 3.1 Layout The board layout for the TPS5430EVM-173 and TPS5431EVM-173 is shown in Figure 3-1 through Figure 3-3. Both EVM circuits use the same printed-circuit board (HPA173). The topside layer of the EVM is laid out in a manner typical of a user application. The top and bottom layers are 2-oz. copper. The top layer contains the main power traces for VIN, OUT, and VPHASE. Also on the top layer are connections for the remaining pins of the TPS5430 and a large area filled with ground. The bottom layer contains ground and signal routes for the ENA feature. The top and bottom and internal ground traces are connected with multiple vias placed around the board including four vias directly under the TPS5430 device to provide a thermal path from the PowerPAD™ land to ground. The input decoupling capacitor (C1) and bootstrap capacitor (C2) are all located as close to the IC as possible. In addition, the voltage set-point resistor divider components are also kept close to the IC. The voltage divider network ties to the output voltage at the point of regulation, the copper Vout trace past the output capacitor C3. For the TPS5430, an additional input bypass capacitor (C4) is required. Figure 3-1. Top-Side Layout 12 TPS5430 and TPS5431 Step-Down Converter Evaluation Module User's SLVU157A – MARCH 2006 – REVISED OCTOBER 2021 Guide Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated www.ti.com Board Layout Figure 3-2. Bottom-Side Layout (Looking From Top Side) Figure 3-3. Top-Side Assembly SLVU157A – MARCH 2006 – REVISED OCTOBER 2021 TPS5430 and TPS5431 Step-Down Converter Evaluation Module User's Submit Document Feedback Guide Copyright © 2021 Texas Instruments Incorporated 13 Schematic and Bill of Materials www.ti.com 4 Schematic and Bill of Materials The TPS5430EVM-173 and TPS5431EVM-173 schematic and bill of materials are presented in this section. 4.1 Schematic The schematic for the TPS5430EVM-173 and TPS5431EVM-173is shown in Figure 4-1. 14 TPS5430 and TPS5431 Step-Down Converter Evaluation Module User's SLVU157A – MARCH 2006 – REVISED OCTOBER 2021 Guide Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated Schematic and Bill of Materials + www.ti.com Figure 4-1. TPS5430EVM-173 Schematic SLVU157A – MARCH 2006 – REVISED OCTOBER 2021 TPS5430 and TPS5431 Step-Down Converter Evaluation Module User's Submit Document Feedback Guide Copyright © 2021 Texas Instruments Incorporated 15 Schematic and Bill of Materials www.ti.com 4.2 Bill of Materials The bill of materials for the TPS5430EVM-173 and TPS5431EVM-173 is given by Table 4-1. Table 4-1. TPS5430EVM-173 Bill of Materials Count RefDes -001 -002 1 0 0 1 1 1 1 C1 Value Description Size Part Number MFR 4.7 μF Capacitor, Ceramic, 50V, X7R, 20% 1812 C4532X5R1H475MT TDK 10 μF Capacitor, Ceramic, 25V, X7R, 20% 1812 C4532X7R1E106KT TDK C2 0.01 μF Capacitor, Ceramic, 50V, X7R, 10% 0603 C1608X7R1H103K TDK 1 C3 220 μF Capacitor, POSCAP, 10V, 40mΩ, 20% 7343(D) 10TPB220M Sanyo 1 0 C4 4.7 μF Capacitor, Ceramic, 50V, X5R, 20% 1812 C4532X5R1H475MT TDK 1 1 D1 Diode, Schottky, 3A, 40V SMA B340A Diode Inc 2 2 J1, J2 Terminal Block, 2-pin, 6-A, 3,5mm 0.27 × 0.25 ED1514 OST 1 1 JP1 Header, 2pin, 100mil spacing, (36-pin strip) 0.100 × 2 PTC36SAAN Sullins 1 0 22 μH Inductor, Power, 3.6A, 50mΩ 0.484 × 0.484 MSS1278-223MLB Coilcraft 0 1 18 μH Inductor, Power, 4A, 43mΩ 0.484 × 0.484 MSS1278-183MLB Coilcraft 1 1 R1 10.0k Resistor, Chip, 1/16W, 1% 0603 Std Std 1 1 R2 3.24k Resistor, Chip, 1/16W, 1% 0603 Std Std 1 1 R3 0 Resistor, Chip, 1/16W, 1% 0603 Std Std 4 4 TP1, TP3, TP5, TP6 Test Point, Red, Thru Hole Color Keyed 0.100 × 0.100 5000 Keystone 2 2 TP2, TP4 Test Point, Black, Thru Hole Color Keyed 0.100 × 0.100 5001 Keystone 1 0 IC, Switching Step-Down Regulator, 5.5V-36V, 3A SO8[DDA] TPS5430DDA TI 0 1 IC, Switching Step-Down Regulator, 5.5V-23V, 3A SO8[DDA] TPS5431DDA TI 1 1 — PCB, 1.95 In × 1.65 In × 0.062 In HPA173 Any 1 1 — Shunt, 100mil, Black 929950-00 3M L1 U1 0.100 5 Revision History NOTE: Page numbers for previous revisions may differ from page numbers in the current version. Changes from Revision * (March 2006) to Revision A (October 2021) Page • Updated the numbering format for tables, figures, and cross-references throughout the document. ................2 • Updated the user's guide title............................................................................................................................. 2 16 TPS5430 and TPS5431 Step-Down Converter Evaluation Module User's SLVU157A – MARCH 2006 – REVISED OCTOBER 2021 Guide Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated IMPORTANT NOTICE AND DISCLAIMER TI PROVIDES TECHNICAL AND RELIABILITY DATA (INCLUDING DATA SHEETS), DESIGN RESOURCES (INCLUDING REFERENCE DESIGNS), APPLICATION OR OTHER DESIGN ADVICE, WEB TOOLS, SAFETY INFORMATION, AND OTHER RESOURCES “AS IS” AND WITH ALL FAULTS, AND DISCLAIMS ALL WARRANTIES, EXPRESS AND IMPLIED, INCLUDING WITHOUT LIMITATION ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT OF THIRD PARTY INTELLECTUAL PROPERTY RIGHTS. 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