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LM334SM Datasheet(PDF) 5 Page - Texas Instruments

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Part No. LM334SM
Description  LM134/LM234/LM334 3-Terminal Adjustable Current Sources
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Maker  TI1 [Texas Instruments]
Homepage  http://www.ti.com
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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
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Product Folder Links: LM134 LM234 LM334




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