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Moteur de recherche de fiches techniques de composants électroniques |
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Moteur de recherche de fiches techniques de composants électroniques |
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LTC3300-1 Fiches technique(PDF) 17 Page - Linear Technology |
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LTC3300-1 Fiches technique(HTML) 17 Page - Linear Technology |
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17 / 46 page  LTC3300-1 17 33001fb For more information www.linear.com/LTC3300-1 OPERATION Cell Discharging (Synchronous) When discharging is enabled for a given cell, the primary side switch is turned on and current ramps in the primary winding of the transformer until the programmed peak current (IPEAK_PRI) is detected at the InP pin. The primary side switch is then turned off, and the stored energy in the transformer is transferred to the secondary-side cells causing current to flow in the secondary winding of the transformer. The secondary-side synchronous switch is turned on to minimize power loss during the transfer period until the secondary current drops to zero (detected at InS). Once the secondary current reaches zero, the secondary switch turns off and the primary-side switch is turned back on thus repeating the cycle. In this manner, charge is transferred from the cell being discharged to all of the cells connected between the top and bottom of the secondaryside—therebychargingtheadjacentcells.Inthe example of Figure 2, the secondary-side connects across 12 cells including the cell being discharged. IPEAK_PRI is programmed using the following equation: IPEAK_PRI = 50mV RSNS_PRI Cell discharge current (primary side) and secondary-side charge recovery current are determined to first order by the following equations: IDISCHARGE = IPEAK_PRI 2 S S + T ⎛ ⎝⎜ ⎞ ⎠⎟ ISECONDARY = IPEAK_PRI 2 1 S + T ⎛ ⎝⎜ ⎞ ⎠⎟ ηDISCHARGE where S is the number of secondary-side cells, 1:T is the transformer turns ratio from primary to secondary, and ηDISCHARGE is the transfer efficiency from primary cell discharge to the secondary side stack. Cell Charging When charging is enabled for a given cell, the secondary- side switch for the enabled cell is turned on and current flows from the secondary-side cells through the trans- former. Once IPEAK_SEC is reached in the secondary side (detected at the InS pin), the secondary switch is turned offandcurrentthenflowsintheprimarysidethuscharging theselectedcellfromtheentirestackofsecondarycells.As with the discharging case, the primary-side synchronous switch is turned on to minimize power loss during the cell charging phase. Once the primary current drops to zero, the primary switch is turned off and the secondary-side switch is turned back on thus repeating the cycle. IPEAK_SEC is programmed using the following equation: IPEAK_SEC = 50mV RSNS_SEC Cell charge current and corresponding secondary-side discharge current are determined to first order by the following equations: ICHARGE = IPEAK_SEC 2 ST S + T ⎛ ⎝⎜ ⎞ ⎠⎟ ηCHARGE ISECONDARY = IPEAK_SEC 2 T S + T ⎛ ⎝⎜ ⎞ ⎠⎟ where S is the number of secondary cells in the stack, 1:T is the transformer turns ratio from primary to secondary, and ηCHARGEisthetransferefficiencyfromsecondary-side stack discharge to the primary-side cell. Each balancer’s charge transfer “frequency” and duty factor depend on a number of factors including IPEAK_PRI, IPEAK_SEC, transformer winding inductances, turns ratio, cell voltage and the number of secondary-side cells. The frequency of switching seen at the gate driver outputs is given by: fDISCHARGE = S S + T • VCELL LPRI •IPEAK_PRI fCHARGE = S S + T • VCELL LPRI •IPEAK_SEC •T where LPRI is the primary winding inductance. Figure 3 shows a fully populated LTC3300-1 application employing all six balancers. |
Numéro de pièce similaire - LTC3300-1_15 |
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Description similaire - LTC3300-1_15 |
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