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SG337T Datasheet(PDF) 5 Page - Microsemi Corporation |
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SG337T Datasheet(HTML) 5 Page - Microsemi Corporation |
5 / 6 page SG137A/SG137 SERIES 2/92 Rev 1.1 2/94 LINFINITY Microelectronics Inc. Copyright © 1994 11861 Western Avenue ∞ ∞ ∞ ∞ ∞ Garden Grove, CA 92841 5 (714) 898-8121 ∞ ∞ ∞ ∞ ∞ FAX: (714) 893-2570 APPLICATION INFORMATION (continued) the SG137A flows from input to output. If this current is not absorbed by the load, the output of the regulator will rise above the regulated value. The current drawn by R 1 and R2 is normally high enough to absorb the current, but care must be taken in no– load situations where R 1 and R2 have high values. The maximum value for the operating current, which must be absorbed, is 5mA for the SG137A, If input-output voltage differential is less than 10V, the operating current that must be absorbed drops to 3mA. The output stability, load regulation, line regulation, thermal EXAMPLES: 1. A precision 10V regulator to supply up to 1Amp load current. a. Select R 1 = 100Ω to minimize effect of IADJ b. Calculate R 2 = = = 704W 2. A 15V regulator to run off batteries and supply 50mA. V IN MAX = 25V a. To minimize battery drain, select R 1 as high as possible R 1 = = 417 Ω, use 404Ω, 1% V OUT - VREF (V REF/R1) + IADJ 10V - 1.25V (1.25V/100W) + 65mA 1.25V 3mA TYPICAL APPLICATIONS regulation, temperature drift, long term drift, and noise, can be improved by a factor of 6.6 over the standard regulator configu- ration. This assumes a zener whose drift and noise is considera- bly 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 Figure 8, 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 -2V. Load regulation of regulators #2 to #N will be improved by V OUT/1.25V compared to a standard regulator, so regulator #1 should be the one which has the lowest load current. FIGURE 11 - DUAL TRACKING SUPPLY ±1.25V to ±20V FIGURE 10 - CURRENT REGULATOR FIGURE 9 - HIGH STABILITY REGULATOR FIGURE 8 - MULTIPLE TRACKING REGULATORS |
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