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L6615 Folha de dados(PDF) 8 Page - STMicroelectronics |
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L6615 Folha de dados(HTML) 8 Page - STMicroelectronics |
8 / 20 page L6615 8/20 APPLICATION INFORMATION Index page 1. Introduction 8 2. Current sense section 9 3. Share drive section, error amplifier and adjust amplifier 10 4. Designing with L6615 10 5. Current sense methods 13 6. Application ideas 14 7. Low voltage buses 15 8. Offset Trimming 16 1 INTRODUCTION Power supply systems are often designed by paralleling converters in order to improve performance and reliability. To ensure uniform distribution of stresses, the total load current should be shared appropriately among the converters. A typical application is showed in fig. 9 for a series of N paralleled modules (PS#1 to PS#N): each of them exhibits 4 terminals: two for the power output (+OUT, -OUT) and two for the remote sense signals (+OUT_S, -OUT_S). On the power lines are placed the sense resistors RSENSE (for the current sensing) and the OR-ing diodes (to avoid that the failure of one module shorts the load out) L6615 allows attaining an automatic master-slave current sharing architecture: one L6615 is associated to each power supply and all these IC's are linked each other through the share bus (referred to the common ground). This kind of system configuration is preferred to the systems in which a single current sharing controller is used because of robustness, reliability and flexibility. To configure a load share controller, few passive components are used. A brief device explanation will follow with the formulas useful to set these external components. Figure 9. Typical high side connection CS- CGA CS+ VCC ADJ SHARE GND COMP 3 2 4 1 5 6 7 8 L6615 +OUT GND PS #1 C C R C R CGA R ADJ R SENSE CS- CGA CS+ VCC ADJ SHARE GND COMP 3 2 4 1 5 6 7 8 L6615 +OUT +OUT_S -OUT_S -OUT PS #N C C R C R CGA R ADJ R SENSE +OUT +OUT_S -OUT_S -OUT R G1 R G2 R G1 R G2 SHARE BUS LOAD CS- CGA CS+ VCC ADJ SHARE GND COMP 3 2 4 1 5 6 7 8 L6615 +OUT GND PS #1 C C R C R CGA R ADJ R SENSE CS- CGA CS+ VCC ADJ SHARE GND COMP 3 2 4 1 5 6 7 8 L6615 +OUT +OUT_S -OUT_S -OUT PS #N C C R C R CGA R ADJ R SENSE +OUT +OUT_S -OUT_S -OUT R G1 R G2 R G1 R G2 SHARE BUS LOAD |
Nº de peça semelhante - L6615 |
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Descrição semelhante - L6615 |
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