LM234(1997) View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

LM234
(Rev.:1997)

THREE TERMINAL ADJUSTABLE CURRENT SOURCES

STMicroelectronics 

LM134-LM234-LM334

TYPICAL APPLICATIONS

Figure 1 : Basic 2-terminal Current Source

Figure 2 : Alternate Trimming Technique

Vi

V

ADJ

V

R set

Vi

V

ADJ

V

R1*

R set

Vi

Figure 3 : Terminating Remote Sensor for

Voltage Output

Vi

V

ADJ

V

R set

VO

RL

V O = ( Iset) (RL) = 10mV/OK

Rset = 230 Ω

RL = 10k Ω

6/10

Vi

* For ±10% adjustment, select Rset 10%

high and make R1 ≈ 3 Rset

Figure 4 : Zero Temperature Coefficient Current

Source

Vi

Vi

ADJ

V

D1

1N 457

R set

R1*

10 R set

Vi

* Select ratio of R1 to Rset to obtain

zero dri ft i+ ≈ 2Iset

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