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SG137A Datasheet(PDF) 4 Page - Microsemi Corporation |
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SG137A Datasheet(HTML) 4 Page - Microsemi Corporation |
4 / 6 page SG137A/SG137 SERIES 2/92 Rev 1.1 2/94 LINFINITY Microelectronics Inc. Copyright © 1994 11861 Western Avenue ∞ ∞ ∞ ∞ ∞ Garden Grove, CA 92841 4 (714) 898-8121 ∞ ∞ ∞ ∞ ∞ FAX: (714) 893-2570 FIGURE 6. ADJUSTMENT CURRENT VS. TEMPERATURE FIGURE 5. INPUT/OUTPUT DIFFERENTIAL VS. OUTPUT CURRENT FIGURE 3. CURRENT VS. INPUT/OUTPUT DIFFERENTIAL FIGURE 2. REFERENCE VOLTAGE VS. TEMPERATURE FIGURE 1. INPUT/OUTPUT DIFFERENTIAL VS. OUTPUT CURRENT FIGURE 4. * OUTPUT VOLTAGE DEVIATION VS. OUTPUT CURRENT CHARACTERISTIC CURVES * The SG137A has load regulation compensation which makes the typical unit read close to zero. This band represents the typical production spread. APPLICATION INFORMATION OUTPUT VOLTAGE The output voltage is determined by two external resistors, R 1 & R 2(see Figure 7). The exact formula for the output voltage is: V OUT = VREF + I ADJ (R2) ( ) Where: V REF =Reference Voltage, IADJ = Adjustment Pin Current. In most applications, the second term is small enough to be ignored, typically about 0.5% of V OUT. In more critical applica- tions, the exact formula should be used, with I ADJ equal to 65µA. Solving for R 2 yields: Smaller values of R 1 and R2 will reduce the influence of IADJ on the output voltage, but the no-load current drain on the regulator will be increased. Typical values for R 1 are between 100Ω and 300Ω, giving 12.5 mA and 4.2mA no-load current respectively. There is an additional consideration in selecting R 1 the minimum load current specification of the regulator. The operating current of R 2 = V OUT - VREF V REF R 1 + I ADJ FIGURE 6 R 2 + R1 R 1 |
Similar Part No. - SG137A_1 |
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Similar Description - SG137A_1 |
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