National Instruments LM1085 Series - Manuals

Page 2 - Ordering Information; Package; Simplified Schematic

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-5.0 Rails LM1085ISX-5.0 Tape a...

Page 4 - Electrical Characteristics

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. Symbol Parameter Conditions Min (Note 6) Typ (Note 5) Max (Note 6) Units I LIMIT Current Limit...

Page 5 - Typical Performance Characteristics; Dropout Voltage vs. Output Current

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. Temperature Ripple Rejection ...

Page 6 - Line Transient Response

Typical Performance Characteristics (Continued) Ripple Rejection vs. Output Current (LM1085-Adj.) Line Transient Response 10094744 10094772 Load Transient Response 10094771 LM1085 www.national.com 6

Page 7 - Application Note

Application Note GENERAL Figure 1 shows a basic functional diagram for the LM1085- Adj (excluding protection circuitry) . The topology is basicallythat of the LM317 except for the pass transistor. Instead of aDarlingtion NPN with its two diode voltage drop, the LM1085uses a single NPN. This results ...

Page 9 - FIGURE 6. Power Dissipation Diagram

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 t...

Page 10 - Typical Applications

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 ...

Page 11 - Battery Backup Regulated Supply

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.national.com 11

Page 12 - Physical Dimensions; NS Package Number TS3B

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.com 12

Page 13 - Notes; Low

Notes National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reservesthe right at any time without notice to change said circuitry and specifications. For the most current product information visit us at www.national.com. L...