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LM828M5 Datasheet(PDF) 8 Page - Texas Instruments |
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LM828M5 Datasheet(HTML) 8 Page - Texas Instruments |
8 / 15 page LM828 SNOS035D – MARCH 2010 – REVISED MAY 2013 www.ti.com REGULATING VOUT It is possible to regulate the negative output of the LM828 by use of a low dropout regulator (such as the LP2980). The whole converter is depicted in Figure 16. This converter can give a regulated output from −1.8V to −5.5V by choosing the proper resistor ratio: Vout = Vref (1 + R1/R2) (6) where, Vref = 1.23V (7) Note that the following conditions must be satisfied simultaneously for worst case design: Vin_min >Vout_min +Vdrop_max (LP2980) (8) + Iout_max × Rout_max (LM828) (9) Vin_max < Vout_max +Vdrop_min (LP2980) (10) + Iout_min × Rout_min (LM828) (11) Figure 16. Combining LM828 with LP2980 to Make a Negative Adjustable Regulator 8 Submit Documentation Feedback Copyright © 2010–2013, Texas Instruments Incorporated Product Folder Links: LM828 |
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