TPS62102EVM

www.ti.com Table of Contents User’s Guide TPS62102 Buck Converter Evaluation Module User's Guide Table of Contents 1 Features...................................................................................................................................................................................2 2 Description.............................................................................................................................................................................. 3 3 Feedback Considerations...................................................................................................................................................... 5 3.1 Error Amplifier.................................................................................................................................................................... 5 3.2 Open-Loop Small Signal AC Model................................................................................................................................... 5 4 Operating Instructions........................................................................................................................................................... 7 4.1 Connect a DC Power Supply to Terminal TB1................................................................................................................... 7 4.2 Connect the Load to TB2................................................................................................................................................... 7 4.3 Place a Jumper on CB2..................................................................................................................................................... 7 4.4 Turn on the Electronic Load............................................................................................................................................... 7 4.5 Turn on the Input Power Supply.........................................................................................................................................7 4.6 Shut Down the Converter...................................................................................................................................................7 5 Evaluation Module Layouts................................................................................................................................................... 8 6 Evalulation Module Components........................................................................................................................................ 10 7 References.............................................................................................................................................................................11 8 Revision History....................................................................................................................................................................11 Trademarks All trademarks are the property of their respective owners. SLUU070A – DECEMBER 2001 – REVISED JUNE 2021 TPS62102 Buck Converter Evaluation Module User's Guide Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated 1 Features www.ti.com 1 Features The TPS62102 Low-Power High-Efficiency Buck Converter includes: • • • • • • • 2 2.5-V to 9-V input range 0.8-V to 8-V output range Dual auto mode for high efficiency at light loads Externally synchornizable 0% to 100% duty cycle BICMOS for low quiescient, standby, and shutdown currents 8-pin SOIC (D) package TPS62102 Buck Converter Evaluation Module User's Guide SLUU070A – DECEMBER 2001 – REVISED JUNE 2021 Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated www.ti.com Description 2 Description The TPS62102EVM–01 evaluation module is supplied fully assembled and ready to test. This evaluation module demonstrates an automatic mode switching converter that is capable of 500-mA output current at 3.3 V. The switching frequency of this converter is 1 MHz free running. Other versions of this converter IC are available that have nominal switching frequencies of 300 kHz, 600 kHz, and 2 MHz. Note that the fundamental frequencies have been chosen to minimize interaction with 455-kHz intermediate frequency (IF) circuits. The user needs to supply a power source and suitable load. Figure 2-1 is the schematic of the evaluation module as assembled. In this configuration, the converter should have a closed-loop bandwidth of approximately 40 kHz. L1 15 µH TPS62102 VIN C1 100 µF 1 VIN SW VOUT 8 C2 1.0 µF D1 MA786CT CB2 2 SD/SYNC 3 MODE PGND 7 FB 6 CB1 GND COMP R6 1 kΩ R5 113 kΩ R1 30.1 kΩ 4 C6 10 µF C4 1.0 nF C8 100 pF R3 0 Ω 5 R4 35.7 kΩ Figure 2-1. Evaulation Module Schematic This evaluation module allows user control over the SD/SYNC and MODE pins of the TPS62102. As supplied, the MODE (CB1) pin should be left floating. This allows the TPS62102 to automatically determine whether it operates in the continuous frequency mode or in a pulsed frequency modulation (PFM) mode of operation. See the TPS62102 data sheet for details[1]. The SD/SYNC pin is jumpered to ground by default. This allows the TPS62102 to free run. Do not allow this pin to float, as it causes erratic and unpredictable behavior. To synchronize the converter to an external source, connect the source to the middle pin of CB2. The source should pulse its output at a frequency higher than the free running frequency of the converter. Attempting to synchronize to a lower frequency than this results in erratic behavior. The pulse amplitude should be between 2 V and the VIN supplied to the evaluation module. Do not use a pulse amplitude higher than VIN. Minimum pulse width for syncro- nous signals is 50 ns. This pin can also cause the converter to shut down and enter a low-current mode of operation. To do this, pull the SD/SYNC pin to 2 V or more, and hold it there as long as shutdown is desi- red. Shutdown occurs approximately 20 ms after SD/SYNC is brought high. SLUU070A – DECEMBER 2001 – REVISED JUNE 2021 TPS62102 Buck Converter Evaluation Module User's Guide Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated 3 www.ti.com Phase 100 Gain (dB) 100 Phase (degrees) Description Gain 0 0 0 100 10k 1M f – Frequency – Hz 100M Figure 2-2. Gain/Phase Response for the Internal Error Amplifier 4 TPS62102 Buck Converter Evaluation Module User's Guide SLUU070A – DECEMBER 2001 – REVISED JUNE 2021 Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated www.ti.com Feedback Considerations 3 Feedback Considerations Figure 3-1 shows the gain and phase response for the internal error amplifier. In addition to thecompensation configuration used, many other feedback configurations are provided for on the evaluation module by using the optional component footprints. Figure 3-1 shows the schematic of the evaluation module with these additional footprints. As is evident, most any common feedback implementation can be achieved by simply shorting across pads or inserting passive components. The extra footprints are all 1206 size for ease of use. L1 15 µH TPS62102 1 C1 100 µF CB2 CB1 VIN SW 8 C2 1.0 µF 1 2 3 1 2 3 D1 2 SD/SYNC 3 MODE 4 GND PGND 7 FB 6 COMP 5 C6 10 µF C7 R6 1 kΩ R1 30.1 kΩ C3 R5 113 kΩ C4 1.0 nF R3 0 Ω R2 C8 100 pF C5 R4 35.7 kΩ Figure 3-1. Complete Evaulation Module Schematic 3.1 Error Amplifier The error amplifier in this chip has a significant impact on what can be done with the feedback loop. To get a realistic model, assume that the error amplifier has 80 dB (dc) gain, with a 2-MHz GBWP. This may be a bit conservative, but ensures a stable loop if designed with these constraints. 3.2 Open-Loop Small Signal AC Model The circuit of Figure 3-2 is used to define the feedback loop for this evaluation module. 3.2.1 Open-Loop Small Signal AC Model M1 is the lumped gain corresponding to the input voltage and the PWM gain. Since the ramp height in the chip is about 1V the PWM gain is 100%/V or just 1 in the free running case. The 8x factor comes from the input voltage of 8 V. The PWM gain increases with synchronization. For instance, syncronizing a 1-MHz nominal free run oscillator to 1.2 MHz increases the PWM gain to: F where • • • • GSYNC =   FSYNC   ×  GFREE FREE (1) GFREE is the free running PWM gain (one here) GSYNC is the synchronized PWM gain FFREE is the free running oscillator frequency FSYNC is the synchronized frequency SLUU070A – DECEMBER 2001 – REVISED JUNE 2021 TPS62102 Buck Converter Evaluation Module User's Guide Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated 5 Feedback Considerations www.ti.com L1 15 µH M1 x 8 X CF 10 µF RESR 0.01 Ω ac C4 1.0 nF M2 x–1 EAO_1 X R6 1 kΩ R5 113 kΩ C8 100 pF R1 30.1 kΩ R4 36 kΩ EAO + Figure 3-2. Open-Loop Small Signal Alternating Current (AC) Model CB1 ADJUSTABLE + POWER SUPPLY – + CB2 TPS6201X EVM + LOAD TB1 TB2 V1 V2 Figure 3-3. Connection Diagram 6 TPS62102 Buck Converter Evaluation Module User's Guide SLUU070A – DECEMBER 2001 – REVISED JUNE 2021 Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated www.ti.com Operating Instructions 4 Operating Instructions 4.1 Connect a DC Power Supply to Terminal TB1 The power supply should be capable of supplying up to 10 V at 0.5 A. The power supply should be set to its minimum output voltage level and current limited to 0.5 A. 4.2 Connect the Load to TB2 This load should be capable of handling 0.5 A at 3.5 V. 4.3 Place a Jumper on CB2 • • Placing the jumper from pin 1 to pin 2 pulls SD/SYNC high, resulting in converter shutdown. Placing a jumper from pin 2 to pin 3 pulls SD/SYNC low, resulting in normal operation. 4.3.1 Placing a Jumper on CB1 is Optional • • • A jumper from pin 1 to pin 2 sets MODE high, forcing the converter into the constant-frequency, heavy-load mode. A jumper from pin 2 to pin 3 sets MODE low, forcing the converter into the pulsed-variable low power mode. Letting MODE float, not using a jumper on CB1, allows the converter to operate in auto-mode, the output load detector circuitry determines if the converter should be running inthe constant-frequency or pulsed-variable frequency mode. 4.4 Turn on the Electronic Load Adjust the load to operate between 10 mA and 500 mA. 4.5 Turn on the Input Power Supply Starting with the input dc power supply at its minimum setting, slowly increase the voltage to7 V ±0.5 V. 4.6 Shut Down the Converter To shut down the converter, decrease the dc input power supply voltage to zero. Turn off the electronic load. SLUU070A – DECEMBER 2001 – REVISED JUNE 2021 TPS62102 Buck Converter Evaluation Module User's Guide Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated 7 Evaluation Module Layouts www.ti.com 5 Evaluation Module Layouts Evaluation module layout examples of the TPS62102EVM–01 PCB are shown in Figure 5-1 through Figure 5-3. They are not to scale and appear here only as a reference. Figure 5-1. Top Layer (Top View) Figure 5-2. Bottom Layer (Top View) 8 TPS62102 Buck Converter Evaluation Module User's Guide SLUU070A – DECEMBER 2001 – REVISED JUNE 2021 Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated www.ti.com Evaluation Module Layouts Figure 5-3. Assenmbly Drawing (Top Assembly) SLUU070A – DECEMBER 2001 – REVISED JUNE 2021 TPS62102 Buck Converter Evaluation Module User's Guide Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated 9 Evalulation Module Components www.ti.com 6 Evalulation Module Components Description Reference Qty Value/Type Number Manufacturer PartNumber C1 1 100mF,±20%,25 V, electrolytic Panasonic–ECG ECE–V1EA101UP C2 1 1.0mF,+80%/–20%, 25 V, ceramic, Y5V Panasonic–ECG ECJ–3YF1E105Z C3,C5, C7 0 Forevaluation use only C4 1 1.0nF, ±10%,X7R, 50 V, ceramic PhycompUSA, Inc. 12062R102K9B20D C6 1 10mF,±10%,X7R, 10 V, ceramic Taiyo Yuden LMK325BJ106MN C8 1 100 pF, ±5%, 50 V, NPO ceramic PhycompUSA, Inc. 1206CG101J9B200 D1 1 100mA, Shottky diode Panasonic– SSG MA3X786 AriesElectronics 12–0511–10 Capacitors Diodes Jumpers CB1,CB2 2 100mil, 3-terminal, strip–line SIP socket Inductors L1 1 15mH,inductor CoilCraft DT1608–153 R1 1 30.1kW,±1%,metal film resistor, 1/8W Panasonic–ECG ERJ–8ENF3012V R2 0 Forevaluation use only R3 1 0kW,±1%,metal film resistor, 1/8W PhycompUSA, Inc. 9C12063A0R00FKHF T R4 1 35.7kW,±1%,metal film resistor, 1/8W Panasonic–ECG ERJ–8ENF3572V R5 1 113kW,±1%,metal film resistor, 1/8W Panasonic–ECG ERJ–8ENF1133V R6 1 1.0kW,±5%,metal film resistor, 1/8W Terminal Blocks TB1,TB2 2 2–positionterminal block connector Weidmuller 171602 ICs U1 1 Lowpowersynchronous buck controller TI TPS62102DR PCBs n/a 1 Printedcircuit board, FR4, 2 oz., 2.800” x 1.500” x 0.063” n/a SLUP055 Resistors 10 TPS62102 Buck Converter Evaluation Module User's Guide ERJ–8GEYJ102V SLUU070A – DECEMBER 2001 – REVISED JUNE 2021 Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated www.ti.com References 7 References Texas Instruments, TPS62102 Low-Power High-Efficiency Buck Converter Data Sheet 8 Revision History NOTE: Page numbers for previous revisions may differ from page numbers in the current version. Changes from Revision * (December 2001) to Revision A (June 2021) Page • Updated user's guide title................................................................................................................................... 2 • Updated the numbering format for tables, figures, and cross-references throughout the document. ................2 SLUU070A – DECEMBER 2001 – REVISED JUNE 2021 TPS62102 Buck Converter Evaluation Module User's Guide Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated 11 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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