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LM285D-2-5 Scheda tecnica(PDF) 8 Page - Texas Instruments |
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LM285D-2-5 Scheda tecnica(HTML) 8 Page - Texas Instruments |
8 / 25 page Q3 Q1 Q4 Q7 Q2 Q5 20 pF 20 pF Q6 Q8 Q12 Q11 Q13 Q10 Q9 Q14 CATHODE ANODE 500 kΩ 500 kΩ 300 kΩ 200 kΩ 50 kΩ 500 Ω 60 kΩ 100 kΩ 600 kΩ 7.5 kΩ 8 LM285-2.5, LM385-2.5, LM385B-2.5 SLVS023K – JANUARY 1989 – REVISED MARCH 2016 www.ti.com Product Folder Links: LM285-2.5 LM385-2.5 LM385B-2.5 Submit Documentation Feedback Copyright © 1989–2016, Texas Instruments Incorporated 7 Detailed Description 7.1 Overview The LMx85-2.5 and LM385B-2.5 devices maintain a nearly constant voltage between the cathode and anode of 2.5 V when the minimum cathode current up to the recommended maximum is provided. See Recommended Operating Conditions for recommended minimum cathode current. 7.2 Functional Block Diagram 7.3 Feature Description A band-gap voltage reference controls a high-gain amplifier and shunt pass element to maintain a nearly constant voltage between the cathode and anode of 2.5 V. Regulation occurs after a minimum current is provided to power the voltage divider and amplifier. Internal frequency compensation provides a stable loop for all capacitive loads. Floating shunt design is useful for both positive and negative regulation applications. 7.4 Device Functional Modes The LMx85-2.5 and LM385B-2.5 devices have a single functional mode. These devices can be used as 2.5-V fixed voltage references. The reference voltage cannot be adjusted for these devices. In order for a proper Reverse Voltage to be developed, current must be sourced into the cathode of LM285. The minimum current needed for proper regulation is denoted in Electrical Characteristics as IZ(MIN). |
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