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LM2767 bảng dữ liệu(PDF) 7 Page - National Semiconductor (TI) |
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LM2767 bảng dữ liệu(HTML) 7 Page - National Semiconductor (TI) |
7 / 9 page Other Applications Paralleling Devices Any number of LM2767s can be paralleled to reduce the out- put resistance. Since there is no closed loop feedback, as found in regulated circuits, stable operation is assured. Each device must have its own pumping capacitor C 1, while only one output capacitor C out is needed as shown in Figure 3. The composite output resistance is: Cascading Devices Cascading the LM2767s is an easy way to produce a greater voltage (A two-stage cascade circuit is shown in Figure 4). The effective output resistance is equal to the weighted sum of each individual device: R out = 1.5Rout_1 +Rout_2 Note that increasing the number of cascading stages is prac- itically limited since it significantly reduces the efficiency, in- creases the output resistance and output voltage ripple. Regulating V OUT It is possible to regulate the output of the LM2767 by use of a low dropout regulator (such as LP2980-5.0). The whole converter is depicted in Figure 5. A different output voltage is possible by use of LP2980-3.3, LP2980-3.0, or LP2980-adj. Note that the following conditions must be satisfied simulta- neously for worst case design: 2V in_min >V out_min +Vdrop_max (LP2980) + Iout_max xRout_max (LM2767) 2V in_max < Vout_max +Vdrop_min (LP2980) + Iout_min xRout_min (LM2767) DS101274-19 FIGURE 3. Lowering Output Resistance by Paralleling Devices DS101274-20 FIGURE 4. Increasing Output Voltage by Cascading Devices www.national.com 7 |
Số phần tương tự - LM2767 |
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Mô tả tương tự - LM2767 |
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