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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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L6714D датащи(PDF) 35 Page - STMicroelectronics |
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L6714D датащи(HTML) 35 Page - STMicroelectronics |
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35 / 70 page  L6714 Remote voltage sense 35/70 11 Remote voltage sense The device embeds a Remote Sense Buffer to sense remotely the regulated voltage without any additional external components. In this way, the output voltage programmed is regulated between the remote buffer inputs compensating motherboard or connector losses. It senses the output voltage remotely through the pins FBR and FBG (FBR is for the regulated voltage sense while FBG is for the ground sense) and reports this voltage internally at VSEN pin with unity gain eliminating the errors. Keeping the FBR and FBG traces parallel and guarded by a power plane results in common mode coupling for any picked-up noise. If remote sense is not required, it is enough connecting the resistor RFB directly to the regulated voltage: VSEN becomes not connected and still senses the output voltage through the remote buffer. In this case the FBG and FBR pins must be connected anyway to the regulated voltage (See Figure 10). Warning: The remote buffer is included in the trimming chain in order to achieve ±0.5% accuracy (0.6% for the AMD DAC) on the output voltage when the RB is used: eliminating it from the control loop causes the regulation error to be increased by the RB offset worsening the device performances. Figure 10. Remote buffer connections VREF FB COMP VSEN 64k FBR FBG 64k RF CF RFB To Vcore (Remote Sense) FB COMP VSEN 64k FBR FBG 64k RF CF RFB To Vcore Remote Buffer Used (Up to 0.5% Accuracy) Remote Buffer NOT Used (Precision Worsened) VREF |
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