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MAX17843ACB Datasheet(PDF) 91 Page - Maxim Integrated Products |
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MAX17843ACB Datasheet(HTML) 91 Page - Maxim Integrated Products |
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91 / 131 page  External Cell Balancing Using BJT Switches An application circuit for cell balancing that employs BJT switches is shown in Figure 61. QBALANCE is selected for power dissipation based on the IB drive current available and the cell-balancing current. DBASE protects QBALANCE from negative VGS during hot-plug events. RBASE protects the device by limiting the hot- pluginrush current. The cell-balancing current is limited by RBALANCE. See Table 47 for BJT balancing components. External Cell-Balancing Short-Circuit Detection A short-circuit fault in the external balancing path results in continuous current flow through RBALANCE and QBALANCE. To detect this fault, the voltage drop across the sense-wire parasitic resistance must be measurable. A very small series resistor can added for this purpose. Figure 61. External Cell Balancing (BJT) Table 47. BJT Balancing Components COMPONENT NAME TYPICAL VALUE OR PART FUNCTION RBIAS 22Ω Voltage-divider for transistor bias RBASE 15Ω Hot-plug current-limiting resistor DBASE S1B Reverse emitter-base voltage protection CBASE 1nF Transient VBE suppression RBALANCE Per balancing-current requirements Balancing current-limiting resistor QBALANCE NST489AMT1 External switch HV BALANCING SWITCH (n) TO ALTMUX TO ALTMUX AGND Cn-1 BALSWn RFILTER RBIAS CFILTER CELL n RFILTER RBALANCE CFILTER CBALFILTER TO HVMUX TO HVMUX TO CELL n-1 TO CELL n+1 SENSE WIRE SENSE WIRE RBIAS RBASE DBASE QBALANCE CBASE SWn-1 SWn Cn MAX17843 12-Channel, High-Voltage Smart Sensor Data-Acquisition Interface www.maximintegrated.com Maxim Integrated │ 91 |
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