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LM134H データシート(PDF) 5 Page - Texas Instruments |
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LM134H データシート(HTML) 5 Page - Texas Instruments |
5 / 25 page LM134, LM234, LM334 www.ti.com SNVS746C – MAY 2004 – REVISED MARCH 2005 Typical Performance Characteristics (continued) Turn-On Voltage Ratio of ISET to IBIAS Figure 11. Figure 12. APPLICATION HINTS The LM134 has been designed for ease of application, but a general discussion of design features is presented here to familiarize the designer with device characteristics which may not be immediately obvious. These include the effects of slewing, power dissipation, capacitance, noise, and contact resistance. Calculating RSET The total current through the LM134 (ISET) is the sum of the current going through the SET resistor (IR) and the LM134's bias current (IBIAS), as shown in Figure 13. Figure 13. Basic Current Source A graph showing the ratio of these two currents is supplied under Ratio of ISET to IBIAS in Typical Performance Characteristics. The current flowing through RSET is determined by VR, which is approximately 214μV/°K (64 mV/298°K ∼ 214μV/°K). (1) Since (for a given set current) IBIAS is simply a percentage of ISET, the equation can be rewritten (2) where n is the ratio of ISET to IBIAS as specified in Electrical Characteristics and shown in the graph. Since n is typically 18 for 2 μA ≤ ISET ≤ 1mA, the equation can be further simplified to Copyright © 2004–2005, Texas Instruments Incorporated Submit Documentation Feedback 5 Product Folder Links: LM134 LM234 LM334 |
同様の部品番号 - LM134H |
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同様の説明 - LM134H |
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