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LM5080MM Datasheet(PDF) 11 Page - National Semiconductor (TI) |
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LM5080MM Datasheet(HTML) 11 Page - National Semiconductor (TI) |
11 / 13 page Voltage Margining Shifting the output regulation voltage up or down by a small amount is referred to as voltage margining. In the remote sense adjust modes and the feedback adjust modes, this can be done by connecting all of the power converter TRIM pins together and injecting a positive or negative current. However, in the reference adjust mode, the TRIM pin is used for current sharing. An alternative margining method is to inject a current into the SHR share bus. This will simulta- neously shift the regulation voltages of all power converter’s while maintaining equal current sharing. The injected current is split equally between the LM5080’s SHR inputs and added to the TRIM pin currents creating an equal offset voltage for all of the power converter references. The trim pin current injected into each power converter’s reference (IT) is depen- dent on the magnitude of the total injected current into the SHR bus (ISHR), the number of LM5080’s on the SHR bus (N) and any transconductance boost supplied (R1 & R2): An alternate method to shift the regulation voltage is to tie all the CSP pins together and inject a current into that node. The trim pin current injected into each power converter’s reference (IT) attributed to the current injected into the CSP node (ICSP) is derived to be: Figure 6 shows a margining up and down application imple- mented using pull up resistors to VCC. Since the SHR and CSP voltages are approximately 0.1 x VCC and 0.2 x VCC respectively, the injected current can be independently con- trolled with RM1 and RM2. 20157812 FIGURE 6. One Method of Implementing Voltage Margining www.national.com 11 |
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