Texas InstrumentsメーカーTPS40003の使用説明書/サービス説明書
ページ先へ移動 of 17
User ’s Guide TPS40003 Based 5–A Converter in Less Than One Square Inch User ’ s G uide.
2 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.
3 DYNAMIC W ARNINGS AND RESTRICTIONS It is important to operate this EVM within the input voltage range of 0 V to 5.5 V . Exceeding the specified input range may cause unexpected operation and/or irreversible damage to the EVM.
SLUU130A – September 2002 – Revised February 2003 4 TPS40003-Based 5-A Converter in Less Than One Square Inch TPS40003-Based 5-A Converter in Less Than One Square Inch Mark D ennis Systems Powe r Contents 1 Introduction 4 . . . . . . . . . . . . .
SLUU130A – September 2002 – Revised February 2003 5 TPS40003-Based 5-A Converter in Less Than One Square Inch 3 Schematic + Figure 1. Application Diagram for the TPS40002/3.
SLUU130A – September 2002 – Revised February 2003 6 TPS40003-Based 5-A Converter in Less Than One Square Inch 4 Design Procedure 4.1 TPS4000X Family Device Selection The TPS4000X family of devices offers four selections to encompass the frequency and output current mode choices.
SLUU130A – September 2002 – Revised February 2003 7 TPS40003-Based 5-A Converter in Less Than One Square Inch 4.4 Output Capacitor Selection Selection of the output capacitor is based on many application variables, including function, cost, size, and availability .
SLUU130A – September 2002 – Revised February 2003 8 TPS40003-Based 5-A Converter in Less Than One Square Inch 4.7 Compensation Design The TPS40003 uses voltage mode control in conjunction with a high frequency error amplifier . For the fastest transient response, the loop crossover frequency is set at 1/10 f S , or 60 kHz.
SLUU130A – September 2002 – Revised February 2003 9 TPS40003-Based 5-A Converter in Less Than One Square Inch Figure 2 shows the plots for the closed loop gain and phase with V IN = 3.3 V and I OUT = 4.4 A. At the crossover frequency of 60 kHz the phase margin is approximately 51 degrees.
SLUU130A – September 2002 – Revised February 2003 10 TPS40003-Based 5-A Converter in Less Than One Square Inch 5 PowerP AD Packaging The TPS4000X family is available in the DGQ version of TI ’ s PowerP AD thermally enhanced package.
SLUU130A – September 2002 – Revised February 2003 11 TPS40003-Based 5-A Converter in Less Than One Square Inch 6 T est Results/Performance Data The test setup is shown in figure 4 SLUP182 TP2 TP1 TP4 TP6 TP3 TP5 J1 J2 LOAD VIN VOUT GND GND (+) ( – ) DVM2 ( – ) (+) DVM1 ( – ) (+) SCOPE C + DC Power Supply CIN = 470 µ F or larger , 6.
SLUU130A – September 2002 – Revised February 2003 12 TPS40003-Based 5-A Converter in Less Than One Square Inch T ypical efficiency curves are shown in Figure 5 for an input of 3.3 V . Efficiency – % EFFICIENCY vs OUTPUT CURRENT I OUT – Output Current – A 01 2 3 45 6 50 55 60 65 70 75 80 85 90 95 100 Figure 5.
SLUU130A – September 2002 – Revised February 2003 13 TPS40003-Based 5-A Converter in Less Than One Square Inch Circuit operation with an output short circuit is shown in Figure 7. After each restart into a short circuit the pulses terminate for a period of approximately 6 ms.
SLUU130A – September 2002 – Revised February 2003 14 TPS40003-Based 5-A Converter in Less Than One Square Inch Figure 9 shows the startup waveforms with an input voltage of 3.3 V and a load of 0.3 Ω . Note that the output is held low until V SS (pin 4) goes above 0.
SLUU130A – September 2002 – Revised February 2003 15 TPS40003-Based 5-A Converter in Less Than One Square Inch 7 PCB Layout Figures 1 1 through13 show the top copper layer , the bottom copper layer , and top assembly layer , of SLUP182.
SLUU130A – September 2002 – Revised February 2003 16 TPS40003-Based 5-A Converter in Less Than One Square Inch 8 List of Material T able 1 lists the components used in this design. With minor component tweaks this design could be modified to meet a wide range of applications.
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.
デバイスTexas Instruments TPS40003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 TPS40003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 TPS40003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 TPS40003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 TPS40003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 TPS40003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 TPS40003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 TPS40003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 TPS40003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。
