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LMS1587CSX-3.3 Datasheet(PDF) 6 Page - Texas Instruments |
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LMS1587CSX-3.3 Datasheet(HTML) 6 Page - Texas Instruments |
6 / 15 page VOUT VIN I1 10 µF VREF 10 µF R1 R2 IADJ VIN VOUT ADJ VOUT = VREF (1 + R2) + IADJR2 R2 R1 LMS1585A , LMS1587 SNVS061G – MONTH 2003 – REVISED JULY 2013 www.ti.com APPLICATION NOTE OUTPUT VOLTAGE The adjustable version develops at 1.25V reference voltage, (VREF), between the output and the adjust terminal. As shown in Figure 3, this voltage is applied across resistor R1 to generate a constant current I1. This constant current then flows through R2. The resulting voltage drop across R2 adds to the reference voltage to sets the desired output voltage. The current IADJ from the adjustment terminal introduces an output error. But since it is small (120μA max), it becomes negligible when R1 is in the 100 Ω range. For fixed voltage devices, R1 and R2 are integrated inside the devices. Figure 3. Basic Adjustable Regulator 6 Submit Documentation Feedback Copyright © 2003–2013, Texas Instruments Incorporated Product Folder Links: LMS1585A LMS1587 |
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