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LM5080MM Datasheet(PDF) 10 Page - National Semiconductor (TI) |
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LM5080MM Datasheet(HTML) 10 Page - National Semiconductor (TI) |
10 / 13 page Remote Sense Adjust Modes (Continued) Feedback Adjustment Mode The feedback adjust mode configuration is shown in Figure 5. It is very similar to the reference adjust mode except the current sensing is done on the high side of the load and the correction is applied to the feedback resistor divider in the voltage regulation loop. Similar to the reference adjust mode, the transfer functions between the sense resistor voltages (VRS) and the currents injected into the power converter TRIM pin (IT) are: IT1 = 0.9 x gm x (VRS1 - VRS2) IT2 = 0.9 x gm x (VRS2 - VRS1) where gm = current share amplifier transconductance (8.7mA/V). As previously described, provided the current sharing is equal (VRS1=VRS2), the correction current to the reference (IT) will be zero. However, any difference between VRS1 and VRS2 will drive the TRIM pin currents in opposite po- larities. As a result the power converter output voltages will be adjusted to force VRS1=VRS2. In this mode, VCC must be biased at least 2V higher than the output regulation voltage to maintain CSP and CSM in the proper common mode range. It is essential the VCC pins of all LM5080’s be tied to the same point in this mode. Any mismatch in the VCC voltages between LM5080’s will con- tribute to current share errors. For the same reasons as discussed in the above two operating modes, the current sense resistors should be located as close to the load as possible. In this mode, the best accuracy will be achieved with lower VCC values since any mismatch in the gain resistors internal to the LM5080 will affect the current share accuracy. 20157808 FIGURE 4. Remote Sense Positive Mode Implementation 20157809 FIGURE 5. Feedback Adjust Mode Implementation www.national.com 10 |
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