Texas InstrumentsメーカーTPS2151の使用説明書/サービス説明書
ページ先へ移動 of 18
.
IMPORT ANT NOTICE T exas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice.
EVM IMPORT ANT NOTICE T exas Instruments (TI) provides the enclosed product(s) under the following conditions: This evaluation kit being sold by TI is intended for use for ENGINEERING DEVELOPMENT OR EV ALUA TION PURPOSES ONL Y and is not considered by TI to be fit for commercial use.
EVM W ARNINGS AND RESTRICTIONS It is important to operate this EVM within the specified input and output ranges described in the EVM User ’ s Guide. Exceeding the specified input range may cause unexpected operation and/or irreversible damage to the EVM.
How to Use This Manual v Preface About This Manual The TPS2151 is one of the four devices in the USB peripheral power management family TPS2140/41/50/51, which integrates both an adjustable linear low-drop voltage regulator (LDO) and a dual-current-limited power switch.
Information About Cautions and Warnings vi Information About Cautions and Warnings This book may contain cautions and warnings. This is an example of a caution statement. A caution statement describes a situation that could potentially damage your software or equipment.
Contents vii 1 Introduction 1-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Schematic, Bill of Materials, Layout, and Setup 2-1 . .
Contents viii.
1-1 Introduction Each device in TPS2140/41/50/51 family integrates a dual-current-limiting power switch and an adjustable low dropout regulator (LDO). Both the switch and LDO limit inrush current by controlling the turnon slew rate and are compatible with USB 1.
1-2.
2-1 Schematic, Bill of Materials, Layout, and Setup This chapter contains schematics, bill of materials, board layout, and setup of EVM.
Schematic of the EVM 2-2 2.1 Schematic of the EVM Figure 2 – 1 shows the schematic of the EVM. Figure 2 – 1. Schematic of the TPS2151 Evaluation Module (EVM) + + + +.
Schematic of the EVM 2-3 Schematic, Bill of Materials, Layout, and Setup Only C2, C4, C5, C6, C8, R2, and R3 are essential for the TPS2151 to function properly . The rest of the components on the EVM are used for dif ferent evaluations of the device. T o evaluate the power switch inrush current, a large capacitor C9 can be added on the EVM.
Bill of Materials 2-4 W arning Users must not activate the load on SW_OUT before the SW_PG rises to high, if the load current is higher than 50 mA. Otherwise, the power switch output could not be charged up to SW_IN rail. 2.2 Bill of Materials The bill of materials (BOM) for the EVM is shown in T able 2 – 1.
Layout of the EVM 2-5 Schematic, Bill of Materials, Layout, and Setup 2.3 Layout of the EVM Figure 2 – 2 illustrates the placement of the components on the top-layer of the TPS2151 EVM. All the components are placed on the top layer only . The bottom layer is mainly a ground plane except for a few short traces.
Layout of the EVM 2-6 2.4 Setup of the EVM Fo r proper operation of the EVM, please follow these steps for any evaluation: 1) V erify that the power supply voltages are in the required ranges: less than 5.5 V but higher than 4.1 V . Make sure the supplies have the capability to supply the current that the loads need.
3-1 Changeable Components and T est Points C1, C2, C3, C4 — input capacitors, at least 0.047 µ F total on each input. C5 , C6, C8, C9 — load capacitors, vary according to loads, but C5 plus C6 must be at least 4.
3-2.
デバイスTexas Instruments TPS2151の購入後に（又は購入する前であっても）重要なポイントは、説明書をよく読むことです。その単純な理由はいくつかあります：
Texas Instruments TPS2151をまだ購入していないなら、この製品の基本情報を理解する良い機会です。まずは上にある説明書の最初のページをご覧ください。そこにはTexas Instruments TPS2151の技術情報の概要が記載されているはずです。デバイスがあなたのニーズを満たすかどうかは、ここで確認しましょう。Texas Instruments TPS2151の取扱説明書の次のページをよく読むことにより、製品の全機能やその取り扱いに関する情報を知ることができます。Texas Instruments TPS2151で得られた情報は、きっとあなたの購入の決断を手助けしてくれることでしょう。
Texas Instruments TPS2151を既にお持ちだが、まだ読んでいない場合は、上記の理由によりそれを行うべきです。そうすることにより機能を適切に使用しているか、又はTexas Instruments TPS2151の不適切な取り扱いによりその寿命を短くする危険を犯していないかどうかを知ることができます。
ですが、ユーザガイドが果たす重要な役割の一つは、Texas Instruments TPS2151に関する問題の解決を支援することです。そこにはほとんどの場合、トラブルシューティング、すなわちTexas Instruments TPS2151デバイスで最もよく起こりうる故障・不良とそれらの対処法についてのアドバイスを見つけることができるはずです。たとえ問題を解決できなかった場合でも、説明書にはカスタマー・サービスセンター又は最寄りのサービスセンターへの問い合わせ先等、次の対処法についての指示があるはずです。
