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| TPS6100x EVM User's Guide May 2000 Power Management Products SLVU029 IMPORTANT NOTICE Texas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue any product or service without notice, and advise customers to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. All products are sold subject to the terms and conditions of sale supplied at the time of order acknowledgment, including those pertaining to warranty, patent infringement, and limitation of liability. TI warrants performance of its semiconductor products to the specifications applicable at the time of sale in accordance with TI's standard warranty. Testing and other quality control techniques are utilized to the extent TI deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily performed, except those mandated by government requirements. Customers are responsible for their applications using TI components. In order to minimize risks associated with the customer's applications, adequate design and operating safeguards must be provided by the customer to minimize inherent or procedural hazards. TI assumes no liability for applications assistance or customer product design. TI does not warrant or represent that any license, either express or implied, is granted under any patent right, copyright, mask work right, or other intellectual property right of TI covering or relating to any combination, machine, or process in which such semiconductor products or services might be or are used. TI's publication of information regarding any third party's products or services does not constitute TI's approval, warranty or endorsement thereof. Copyright (c) 2000, Texas Instruments Incorporated How to Use This Manual Preface Read This First About This Manual This user's guide describes the evaluation module (EVM) TPS6100x EVM-156. The TPS6100x family of devices is a single-cell boost converter with start-up into full load. The TPS6100x family is intended for systems with a single or dual-battery cell supply and a required output voltage between1.5 V and 3.3 V. The guide contains the EVM schematic with an attached bill of material, which shows the components used with their manufacturers. The layout and the component placement of the top and bottom side of the board is shown. The board is assembled on both sides. The following layout considerations point out the most important layout issues, which must be followed to avoid oscillations and instability. The Setup of the EVM section describes how to start working with the board. The next section covers the low-battery feature, which typically works as a battery supervisor. How to Use This Manual This document contains the following chapters: - Chapter 1 - Introduction - Chapter 2 - Schematic and Bill of Material - Chapter 3 - Layout - Chapter 4 - Setup of the EVM Read This First iii Related Documentation From Texas Instruments Related Documentation From Texas Instruments 1) TPS6100x Single-Cell Boost Converter With Start-Up Into Full Load - data sheet (literature number SLVS279) 2) Understanding Boost Power Stages in Switchmode Power Sup- plies (literature number SLVA061) 3) Linear Design Seminar (literature number SLYD016) iv Running Title--Attribute Reference Contents 1 2 3 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 Schematic and Bill of Material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1 Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.1 Top-Side Layout and Component Placement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.2 Bottom-Side Layout and Component Placement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.3 Layout Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1 3-2 3-2 3-3 4 Setup of the EVM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1 4.1 Setup of the EVM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2 4.2 Low-Battery Function LBI and LBO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3 Figures 2-1 3-1 4-1 4-2 Schematic of the EVM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Topology of a Boost Converter Stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Setup of the EVM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Resistive Divider at LBI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2 3-3 4-2 4-3 Contents v vi Chapter 1 Introduction The Texas Instruments TPS6100x are low-power single-cell boost converters. The TPS61002, TPS61003, and TPS61006 are fixed voltage versions with 1.8-V, 2.5-V and 3.3-V output voltage. The TPS61000 can be adjusted with an external voltage divider to an output voltage between 1.5 V and 3.3 V. Each of these four versions is supported with its own EVM. The EVM with the adjustable output voltage version is adjusted to 3.3-V output voltage. The maximum output current at an input voltage down to 0.8 V (single batterycell supply) is 100 mA. If two battery cells are used as supply, output currents up to 200 mA can be drawn at an input voltage down to 1.6 V. The device can be started into a full load with supply voltages down to 0.9 V over the full temperature range. The high power conversion efficiency of up to 90%, a low quiescent current of less than 50 A, and a special power-save mode makes this family of devices well-suited for battery-powered applications. These EVMs should help to evaluate the device directly in the application. The board can be used, for example, to measure the efficiency of different external components and determine the best for the application. The ripple of the output voltage be can easily measured, depending on the output capacitor used. The board is assembled with a 22-F multilayer ceramic output capacitor from Taiyo Yuden, which has an ultralow ESR to keep the output ripple as low as possible. If another fixed-voltage version is of interest, the assembled device can be replaced with the desired device. Other fixed voltage versions are TPS61001, TPS61004, and TPS61005 with 1.5-V, 2.8-V and 3-V output voltage. Free samples can be ordered from http://www.ti.com. Type in the complete device name in the quick search box and select Check stock or order under Availability/Samples. To get more detailed information about the device, see the TPS6100x data sheet (literature number SLVS279). Introduction 1-1 1-2 Chapter 2 Schematic and Bill of Material Figure 2-1. Schematic of the EVM J1 R6 C5 C6 COMP FB OUT R4 R3 GND SWITCH VO C2 D1 VBAT C1 C3 LBI NC L1 R2 R1 IN R5 LP1 J2 EN LBO Schematic and Bill of Material 2-1 Table 2-1. Bill of Material Component IC1 Value Texas Instruments: TPS6100x 10-pin MSOP package 10 H, Coilcraft: DS1608C-103 Motorola: MBRM120LT3 1 M, 1% 909 k, 1% 178 k, 1% (only TPS61000-ADA) 1 M, 1% (only TPS61000-ADA) 33 k, 5% 470 k, 5% 10 F, Taiyo Yuden: JMK316BJ106ML-T 22 F, Taiyo Yuden: LMK432BJ226MM-T 100 nF, 10 V 10 nF, 10 V 47 pF, 10 V 3-pin 3-pin 4-pin 4-pin Functionality Controller-IC in the boost-converter stage L1 D1 R1 R2 R3 R4 R5 R6 C1 C2 C3 C5 C6 J1 J2 IN OUT Inductor for storing energy during on-state of the power transistor Schottky diode for rectifying current flow, works as a free-wheeling diode Resistor to adjust the threshold voltage, supervised by the low-battery function Resistor to adjust the threshold voltage, supervised by the low-battery function Resistor to adjust the output voltage for the adjustable version Resistor to adjust the output voltage at the adjustable version Resistor to compensate the control loop Pullup resistor for the open-drain output of the low-battery output Input capacitor to stabilize input voltage Output capacitor to supply the load during on state of the power transistor Input capacitor for filtering spikes Capacitor to compensate the control loop Capacitor to compensate the control loop To enable (connect to VBATT) or disable (to GND) the device Not used for this family of devices To connect the device to the battery and GND Input To connect the device to the load and GND Output 2-2 Chapter 3 Layout Topic 3.1 3.2 3.3 Page Top-Side Layout and Component Placement . . . . . . . . . . . . . . . . . . . . 3-2 Bottom-Side Layout and Component Placement . . . . . . . . . . . . . . . . . 3-2 Layout Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3 Layout 3-1 Top-Side Layout and Component Placement 3.1 Top-Side Layout and Component Placement 3.2 Bottom-Side Layout and Component Placement 3-2 Layout Considerations 3.3 Layout Considerations The basic components of a boost converter topology (as shown in Figure 3-1) are placed on the top side of the EVM. These are the components which carry the high currents. The ground plane is divided into two parts that are connected to the ground pin of the device. The ground plane on the top side carries the inductor current and the load current back to the ground terminal of the power supply. The ground plane on the bottom side of the EVM is for connecting the sensitive parts to ground. These are the compensation network and the voltage divider for the low-battery function and for fixing the output voltage on the adjustable version. It is very important to keep noisy and high current traces away from sensitive lines or to separate them by using additional ground traces between them, otherwise instability or oscillation can occur. The resistive divider for fixing the output voltage should be placed as close as possible to the FB pin. Since the device has a high switching frequency of 500 kHz and large peak currents, the layout is an extemely important part of the design. All power components like the input and output capacitors, the inductor, the diode, and the device should be kept as close together as possible. The traces should be kept short, wide, and direct. Figure 3-1. Topology of a Boost Converter Stage L1 IC1 D1 VI C1 + _ VREF VO C2 Layout 3-3 3-4 Chapter 4 Setup of the EVM Topic 4.1 4.2 Page Setup of the EVM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2 Low-Battery Function LBI and LBO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3 Setup of the EVM 4-1 4.1 Setup of the EVM Figure 4-1. Setup of the EVM Oscilloscope for Output Voltage and Output Ripple Voltage Meter for LBO Output Voltage Voltage Meter for Input Voltage + LOAD Power Supply - Current Meter for Output Current Important Current Meter for Input Current (See Note A) Note A: Use this current meter only if the sense wires of the supply are used. Follow these steps for proper operation of the EVM: 1) Connect J1, the Enable-pin, with VDD as shown in Figure 4-1. 2) Connect the sense wires of the power supply to the input terminals of the board, or solder the connections of the power supply to the terminals. 3) Connect the input voltage meter between the board on the one side and the power supply and input current meter on the other side. 4) Connect the oscilloscope between the output terminals of the EVM on the one side and the load and output current meter on the other side. 4-2 Low-Battery Function LBI and LBO 4.2 Low-Battery Function LBI and LBO The low battery feature is typically used to supervise the battery voltage and to indicate when the voltage goes below an adjustable threshold voltage. The threshold voltage can be adjusted by an external resistive divider connected to the low-battery input (LBI) as shown in Figure 4-2. It can be calculated by using equation 1. V threshold + R2 )1 R1 V REF + 909 kW ) 1 1 MW 0.5 V + 0.955 V (1) On the EVM, the threshold voltage is adjusted to about 0.96 V. If the battery voltage goes below 0.96 V, the LBO open-drain output is pulled down to ground. Otherwise, it is in a high-impedance state and the voltage is pulled up via the external resistor R6 to VO. R1 is a 1-M resistor, so that the current through R1 is about 50 times higher than the typical current into the LBI pin of 10 nA. Therefore, the LBI input current can be neglected in the calculations. Figure 4-2. Resistive Divider at LBI R2 909 k TPS6100x LBI LBO R6 470 k R1 1 M VLBO Note: Voltage drops can be found on the input line although there are two input capacitors. These spikes can be the reason for triggering the LBO earlier than expected, since the input voltage decreases the adjusted threshold voltage for short periods of time. Be aware of this. Setup of the EVM 4-3 4-4 |
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