Manuale d’uso / di manutenzione del prodotto HPA070 del fabbricante Texas Instruments
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User ’s Guide 1 TPS40055-Based Design Converts 12-V Bus to 1.8 V at 15 A (HP A070) 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 DC to 14 V DC . Exceeding the specified input range may cause unexpected operation and/or irreversible damage to the EVM.
SLUU186 − March 2004 4 TPS40055-Based Design Converts 12-V Bus to 1.8 V at 15 A (HP A070) TPS40055-Based Design Converts 12-V Bus to 1.8 V at 15 A (HP A070) Mark D ennis System Pow er Contents 1 Introduction 4 . . . . . . . . . . . . . . . . . . . .
SLUU186 − March 2004 5 TPS40055-Based Design Converts 12-V Bus to 1.8 V at 15 A (HP A070) 3 Schematic + + Figure 1. TPS40055EVM−001 (HP A070) Schematic.
SLUU186 − March 2004 6 TPS40055-Based Design Converts 12-V Bus to 1.8 V at 15 A (HP A070) 4 Component Selection 4.1 TPS40055 Device Selection Th e TPS4005x family of parts offers a range of output current configurations including source only (TPS40054), source/sink (TPS40055), or source/sink with V OUT prebias (TPS40057).
SLUU186 − March 2004 7 TPS40055-Based Design Converts 12-V Bus to 1.8 V at 15 A (HP A070) 4.3 UVLO Circuitry The user programmable UVLO built into the TPS4005x provides hysteresis for transients shorter than a total count of seven cycles.
SLUU186 − March 2004 8 TPS40055-Based Design Converts 12-V Bus to 1.8 V at 15 A (HP A070) 4.6 Output Capacitor Selection Selection of the output capacitor is based on many application variables, including function, cost, size, and availability .
SLUU186 − March 2004 9 TPS40055-Based Design Converts 12-V Bus to 1.8 V at 15 A (HP A070) 4.8 Short Circuit Protection The TPS40055 implements short circuit protection by comparing the voltage across the topside MOSFET while it is ON to a voltage developed across R LIM due to an internal current source of 10 µ A inside pin 16.
SLUU186 − March 2004 10 TPS40055-Based Design Converts 12-V Bus to 1.8 V at 15 A (HP A070) 5 T est Setup Figure 2 illustrates the basic test setup needed to evaluate the TPS40055EVM−001. 5.1 DC Input Source The input voltage source should be capable of supplying between 10 V DC and 14 V DC and rated for at least 4 A of current.
SLUU186 − March 2004 11 TPS40055-Based Design Converts 12-V Bus to 1.8 V at 15 A (HP A070) 6 T est Results / Performance Data 6.1 Efficiency and Power Loss Figure 3 shows the efficiency as the load is varied from 1 A to over 15 A. The typical ef ficiency remains over 90% as the load ranges from 3 A to 12 A.
SLUU186 − March 2004 12 TPS40055-Based Design Converts 12-V Bus to 1.8 V at 15 A (HP A070) 6.3 Output Ripple and T ransient Response Figure 6 shows the typical output voltage ripple with I OUT =15 A to be less than 20 mVpp. The transient response is shown in Figure 7 as the load is stepped from 5 A to 15 A.
SLUU186 − March 2004 13 TPS40055-Based Design Converts 12-V Bus to 1.8 V at 15 A (HP A070) Figure 9. T op Side Copper Figure 10. Internal Layer 1 Copper.
SLUU186 − March 2004 14 TPS40055-Based Design Converts 12-V Bus to 1.8 V at 15 A (HP A070) Figure 1 1. Internal Layer 2 Copper Figure 12. Bottom Layer Copper.
SLUU186 − March 2004 15 TPS40055-Based Design Converts 12-V Bus to 1.8 V at 15 A (HP A070) 8 List of Materials T able 1 lists the parts values of the evaluation board.
SLUU186 − March 2004 16 TPS40055-Based Design Converts 12-V Bus to 1.8 V at 15 A (HP A070) 9 References 1. Data Sheet, TPS40055 Wide-Input Synchronous Buck Controller (SLUS593).
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 HPA070 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 HPA070 - in questo modo è possibile verificare se l’apparecchio soddisfa le tue esigenze. Esplorando le pagine segenti del manuali d’uso Texas Instruments HPA070 imparerai tutte le caratteristiche del prodotto e le informazioni sul suo funzionamento. Le informazioni sul Texas Instruments HPA070 ti aiuteranno sicuramente a prendere una decisione relativa all’acquisto.
In una situazione in cui hai già il Texas Instruments HPA070, 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 HPA070.
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 HPA070. Quasi sempre, ci troverai Troubleshooting, cioè i guasti più frequenti e malfunzionamenti del dispositivo Texas Instruments HPA070 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.
