Rainbow-electronics LM334 User Manual Page 1

LM134/LM234/LM3343-Terminal Adjustable Current SourcesGeneral DescriptionThe LM134/LM234/LM334 are 3-terminal adjustable currentsources featuring 10,0

Typical Applications (Continued)Ramp Generator005697191.2V Reference Operates on 10 µA and 2V00569720*Select ratio of R1 to R2 to obtain zero temperat

Typical Applications (Continued)Buffer for Photoconductive Cell00569751Generating Negative Output Impedance00569723*ZOUT≈ −16•R1 (R1/VINmust not excee

Schematic Diagram (Continued)00569711LM134/LM234/LM334www.national.com 12

Physical Dimensions inches (millimeters)unless otherwise notedOrder Number LM134H, LM234H or LM334HNS Package Number H03HLM134/LM234/LM334www.national

Physical Dimensions inches (millimeters) unless otherwise noted (Continued)SO Package (M)Order Number LM334M, LM334MX,LM334SM or LM334SMXNS Package Nu

NotesNational does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reservesthe r

Absolute Maximum Ratings (Note 1)If Military/Aerospace specified devices are required,please contact the National Semiconductor Sales Office/Distribut

Electrical Characteristics (Note 2) (Continued)Note 4: ISETis directly proportional to absolute temperature (˚K). ISETat any temperature can be calcul

Typical Performance CharacteristicsOutput ImpedanceMaximum Slew RateLinear Operation00569730 00569731Start-Up Transient Response0056973200569733Voltag

Typical Performance Characteristics (Continued)Turn-On Voltage Ratio of ISETto IBIAS0056972900569703Application HintsThe LM134 has been designed for e

Application Hints (Continued)regulation by at least an order of magnitude. DC character-istics (with the exception of minimum input voltage), are nota

Application Hints (Continued)The set current (ISET) is the sum of I1and I2, each contrib-uting approximately 50% of the set current, and IBIAS.IBIASis

Application Hints (Continued)If the forward voltage drop of the diode was 0.65V instead ofthe estimate of 0.6V (an error of 8%), the actual set curren

Typical Applications (Continued)Higher Output Current00569705*Select R1 and C1 for optimum stabilityBasic 2-Terminal Current Source00569701Micropower