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TLV431AE5TA Datasheet(PDF) 11 Page - Zetex Semiconductors |
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TLV431AE5TA Datasheet(HTML) 11 Page - Zetex Semiconductors |
11 / 16 page TLV431 Issue 1 - June 2008 11 www.zetex.com © Zetex Semiconductors plc 2008 Figure 6. Increasing output voltage of a fixed linear regulator One of the useful applications of the TLV431 is in using it to improve the accuracy and/or extend the range and flexibility of fixed voltage regulators. In the circuit in Figure 6 above, both the output voltage and its accuracy are entirely determined by the TLV431, R1 and R2. However the rest of the features of the regulator (up to 5A output current, output current limiting and thermal shutdown) are all still available. Figure 7. Adjustable linear voltage regulator Figure 7 is similar to Figure 6 with adjustability added. Note the addition of R3. This is only required for the AP1117 due to the fact that its ground or adjustment pin can only supply a few micro-Amps of current at best. R3 is therefore needed to provide sufficient bias current for the TLV431. (All features of the regulator such as short circuit protection, thermal shutdown, etc, are maintained.) (All features of the regulator such as short circuit protection, thermal shutdown, etc, are maintained.) GND V IN V OUT AP1084 Volt Reg GND R2 TLV431 R1 V IN V OUT 0.1µF C1 V REF VREG ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ + = 2 1 1 R R V V REF OUT ) ( REF REG OUT V V V + ≥ GND Vin Vout VR1 AP1117 GND R2 TLV431 V IN V OUT 0.1µF C1 R3 R1 V REF 1.2V I B ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ + = 2 1 1 R R V V REF OUT ) ( REF REG OUT V V V + ≥ B REG OUT IN I V V V R ) ( 3 − − = mA I mA B 15 1 . 0 ≤ ≤ |
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