Manuale d’uso / di manutenzione del prodotto LM1085 Series del fabbricante National Instruments
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LM1085 3A Low Dropout Positive Regulators General Description The LM1085 is a series of low dropout positive voltage regulators with a maximum dropout of 1.5V at 3A of load current. It has the same pin-out as National Semiconductor ’s industry standard LM317.
Ordering Information Package Temperature Range Part Number Transport Media NSC Drawing 3-lead TO-263 −40˚C to +125˚C LM1085IS-ADJ Rails TS3B LM1085ISX-ADJ Tape and Reel LM1085IS-12 Rails LM1085ISX-12 Tape and Reel LM1085IS-3.3 Rails LM1085ISX-3.3 Tape and Reel LM1085IS-5.
Absolute Maximum Ratings (Note 1) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Maximum Input to Output V oltage Dif ferential LM1085-ADJ 29V LM1085-12 18V LM1085-3.
Electrical Characteristics (Continued) Typicals and limits appearing in normal type apply for T J = 25˚C. Limits appearing in Boldface type apply over the entire junc- tion temperature range for operation.
Typical Performance Characteristics Dropout Voltage vs. Output Current Short-Circuit Current vs. Input/Output Difference 10094763 10094768 Percent Change in Output Voltage vs. Temperature Adjust Pin Current vs. Temperature 10094799 10094798 Maximum Power Dissipation vs.
Typical Performance Characteristics (Continued) Ripple Rejection vs. Output Current (LM1085-Adj.) Line Transient Response 10094744 10094772 Load Transient Response 10094771 LM1085 www .
Application Note GENERAL Figure 1 shows a basic functional diagram for the LM1085- Adj (excluding protection circuitry) . The topology is basically that of the LM317 except for the pass transistor . Instead of a Darlingtion NPN with its two diode voltage drop, the LM1085 uses a single NPN.
Application Note (Continued) Figure 3 shows a typical application using a fixed output regulator . Rt1 and Rt2 are the line resistances. V LOAD is less than the V OUT by the sum of the voltage drops along the line resistances. In this case, the load regulation seen at the R LOAD would be degraded from the data sheet specification.
Application Note (Continued) must be added, one for case to heat-sink ( θ CH ) and one for heatsink to ambient ( θ HA ). The junction temperature can be predicted as follows: T J =T A +P D ( θ JC + θ CH + θ HA )=T A +P D θ JA T J is junction temperature, T A is ambient temperature, and P D is the power consumption of the device.
Typical Applications 10094767 5V to 3.3V, 1.5A Regulator 10094750 Adjustable @ 5V 10094752 1.2V to 15V Adjustable Regulator 10094753 5V Regulator with Shutdown 10094754 Battery Charger 10094755 Adjustable Fixed Regulator 10094756 Regulator with Reference 10094757 High Current Lamp Driver Protection LM1085 www .
Typical Applications (Continued) 10094759 Battery Backup Regulated Supply 10094760 Ripple Rejection Enhancement 10094761 Automatic Light control 10094762 Generating Negative Supply voltage 10094758 Remote Sensing LM1085 www .
Physical Dimensions inches (millimeters) unless otherwise noted 3-Lead TO-263 NS Package Number TS3B 3-Lead TO-220 NS Package Number T03B LM1085 www .national.
Notes National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications. For the most current product information visit us at www.
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 National Instruments LM1085 Series 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 National Instruments LM1085 Series - in questo modo è possibile verificare se l’apparecchio soddisfa le tue esigenze. Esplorando le pagine segenti del manuali d’uso National Instruments LM1085 Series imparerai tutte le caratteristiche del prodotto e le informazioni sul suo funzionamento. Le informazioni sul National Instruments LM1085 Series ti aiuteranno sicuramente a prendere una decisione relativa all’acquisto.
In una situazione in cui hai già il National Instruments LM1085 Series, 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 National Instruments LM1085 Series.
Tuttavia, uno dei ruoli più importanti per l’utente svolti dal manuale d’uso è quello di aiutare a risolvere i problemi con il National Instruments LM1085 Series. Quasi sempre, ci troverai Troubleshooting, cioè i guasti più frequenti e malfunzionamenti del dispositivo National Instruments LM1085 Series 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.
