Manuale d’uso / di manutenzione del prodotto TPS40003 del fabbricante Texas Instruments
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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.
Un punto importante, dopo l’acquisto del dispositivo (o anche prima di acquisto) è quello di leggere il manuale. Dobbiamo farlo per diversi motivi semplici:
Se non hai ancora comprato il Texas Instruments TPS40003 è un buon momento per familiarizzare con i dati di base del prodotto. Prime consultare le pagine iniziali del manuale d’uso, che si trova al di sopra. Dovresti trovare lì i dati tecnici più importanti del Texas Instruments TPS40003 - in questo modo è possibile verificare se l’apparecchio soddisfa le tue esigenze. Esplorando le pagine segenti del manuali d’uso Texas Instruments TPS40003 imparerai tutte le caratteristiche del prodotto e le informazioni sul suo funzionamento. Le informazioni sul Texas Instruments TPS40003 ti aiuteranno sicuramente a prendere una decisione relativa all’acquisto.
In una situazione in cui hai già il Texas Instruments TPS40003, ma non hai ancora letto il manuale d’uso, dovresti farlo per le ragioni sopra descritte. Saprai quindi se hai correttamente usato le funzioni disponibili, e se hai commesso errori che possono ridurre la durata di vita del Texas Instruments TPS40003.
Tuttavia, uno dei ruoli più importanti per l’utente svolti dal manuale d’uso è quello di aiutare a risolvere i problemi con il Texas Instruments TPS40003. Quasi sempre, ci troverai Troubleshooting, cioè i guasti più frequenti e malfunzionamenti del dispositivo Texas Instruments TPS40003 insieme con le istruzioni su come risolverli. Anche se non si riesci a risolvere il problema, il manuale d’uso ti mostrerà il percorso di ulteriori procedimenti – il contatto con il centro servizio clienti o il servizio più vicino.
