LM134, LM234, LM334

SNVS746E – MARCH 2000 – REVISED MAY 2013

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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.

Figure 13. Basic Current Source

mV/298°K

∼ 214μV/°K).

(1)

where

•

(2)

Since n is typically 18 for 2

(3)

for most set currents.

Slew Rate

At slew rates above a given threshold (see curve), the LM134 may exhibit non-linear current shifts. The slewing

1mA, the limit is 1V/

μs. Slew rates above the limit do not harm the LM134, or cause large currents to flow.

Thermal Effects

(0.4) (0.33) = 0.132%. This is a 10:1 degradation in regulation compared to true electrical effects. Thermal

sinking of the TO package or the TO-92 leads can reduce this effect by more than 3:1.

6

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