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LM137 Arkusz danych(PDF) 9 Page - Linear Technology |
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LM137 Arkusz danych(HTML) 9 Page - Linear Technology |
9 / 12 page 9 137afb LT137A/LM137 LT337A/LM337 TYPICAL APPLICATIONS A high stability regulator is illustrated in the application circuit shown to the right. The output stability, load regula- tion, line regulation, thermal regulation, temperature drift, long term drift, and noise can be improved by a factor of 6.6 over the standard regulator configuration. This assumes a zener whose drift and noise is considerably better than the regulator itself. The LM329B has 20ppm/°C maximum drift and about 10 times lower noise than the regulator. In the application shown below, regulators #2 to “N” will track regulator #1 to within ±24mV initially, and to ±60mV over all load, line, and temperature conditions. If any regulator output is shorted to ground, all other outputs will drop to approximately ≈ –2V. Load regulation of regula- tors 2 to “N” will be improved by VOUT/1.25V compared to a standard regulator, so regulator #1 should be the one which has the lowest load current. Multiple Tracking Regulators High Stability Regulator Dual Tracking Supply ±1.25V to ±20V Current Regulator LT137A ADJ VIN –VIN R2* 7V LM329B VOUT –VOUT 137A TA03 R1 1k 1% R3 1.5k 1% + 1μF SOLID TANTALUM *R2 = – 908Ω |VOUT| 9.08 • 10–3 LT337A ADJ VIN (–) VOUT (+) 137A TA05 RS I + C1 1μF SOLID TANTALUM I = 65μA + (0.8Ω < RS < 250Ω) 1.25V RS LT337A ADJ VIN –VIN R3 5k *SOLID TANTALUM **R1 OR R5 MAY BE TRIMMED SLIGHTLY TO IMPROVE TRACKING D2 1N4002 VOUT –VOUT 137A TA04 R4 5k 1% R2 5k 1% R5** 100Ω 1% LT317A ADJ VIN +VIN VOUT +VOUT + 2.2μF* + 10μF + 10μF R1** 100Ω 1% D1 1N4002 + 2.2μF* REG #1 ADJ VIN –VIN R2 VOUT –VOUT1 137A TA02 R1 120Ω 1N4002 C1 1μF SOLID TANTALUM + C3 10μF + 2μF REG #2 LT137A LT137A ADJ VIN VOUT –VOUT2 137A TA02 1N4002 1μF SOLID TANTALUM + 2μF + REG #N LT137A ADJ VIN VOUT –VOUT3 137A TA02 1μF SOLID TANTALUM + 2μF + |
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