LM120_15 Datasheet, PDF (12/22 Pages) Texas Instruments – LM120/LM320-N Series 3-Terminal Negative Regulators

LM120, LM320-N
SNVS756C – APRIL 1998 – REVISED APRIL 2013
TYPICAL APPLICATIONS
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Lead and line regulation — 0.01% temperature stability — 0.2%
†Determines Zener current.
††Solid tantalum.
An LM120-12 or LM120-15 may be used to permit higher input voltages, but the regulated output voltage must be at
least −15V when using the LM120-12 and −18V for the LM120-15.
**Select resistors to set output voltage. 2 ppm/°C tracking suggested.
Figure 16. High Stability 1 Amp Regulator
*Resistor tolerance of R1 and R2 determine matching of (+) and (−) inputs.
**Necessary only if raw supply capacitors are more than 3″ from regulators
An LM3086N array may substitute for Q1, D1 and D2 for better stability and tracking. In the array diode transistors Q5
and Q4 (in parallel) make up D2; similarly, Q1 and Q2 become D1 and Q3 replaces the 2N2222.
Figure 17. Wide Range Tracking Regulator
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