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L6714 Datasheet(PDF) 33 Page - STMicroelectronics |
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L6714 Datasheet(HTML) 33 Page - STMicroelectronics |
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33 / 70 page  L6714 Current reading and current sharing loop 33/70 10.1 Low side current reading When reading current across LS, the current flowing trough each phase is read using the voltage drop across the low side MOSFET RdsON or across a sense resistor in its series and it is internally converted into a current. The trans-conductance ratio is issued by the external resistor Rg placed outside the chip between CSx- and CSx+ pins toward the reading points. The current sense circuit tracks the current information for a time TTRACK centered in the middle of the LS conduction time and holds the tracked information during the rest of the period. L6714 sources a constant 25 µA bias current from the CSx+ pin: the current reading circuitry uses this pin as a reference and the reaction keeps the CSx- pin to this voltage during the reading time (an internal clamp keeps CSx+ and CSx- at the same voltage sinking from the CSx- pin the necessary current during the hold time; this is needed to avoid absolute maximum rating overcome on CSx- pin). The current that flows from the CSx- pin is then given by (See Figure 9): where RdsON is the ON resistance of the low side MOSFET and Rg is the trans-conductance resistor used between CSx- and CSx+ pins toward the reading points; IPHASEx is the current carried by the relative phase and IINFOx is the current information signal reproduced internally. 25 µA offset allows negative current reading, enabling the device to check for dangerous returning current between the phases assuring the complete current equalization. 10.2 Inductor current reading When reading current across the inductor DCR, the current flowing trough each phase is read using the voltage drop across the output inductor or across a sense resistor in its series and internally converted into a current. The trans-conductance ratio is issued by the external resistor Rg placed outside the chip between CSx- pin toward the reading points. The current sense circuit always tracks the current information, no bias current is sourced from the CSx+ pin: this pin is used as a reference keeping the CSx- pin to this voltage. To correctly reproduce the inductor current an R-C filtering network must be introduced in parallel to the sensing element. The current that flows from the CSx- pin is then given by the following equation (See Figure 9): Where IPHASEx is the current carried by the relative phase. I CSx- 25 µA R dsON Rg ----------------- I PHASEx ⋅ + 25 µAI INFOx + == I CSx- R L Rg -------- 1s L R L ⁄ ⋅ + 1s R C ⋅⋅ + ------------------------------------- I ⋅ PHASEx ⋅ = |
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