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AIC1811CCV Datasheet(PDF) 6 Page - Analog Intergrations Corporation |
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AIC1811CCV Datasheet(HTML) 6 Page - Analog Intergrations Corporation |
6 / 8 page AIC1811 6 detection circuitry. Charging is determined to be in progress if the voltage between CS and GND is below charge detection threshold voltage (VCH). DESIGN GUIDE Selection of External Control MOSFETs Because the overcurrent protection voltage is preset, the threshold current for overcurrent detection is determined by the turn-on resistance of the discharge control MOSFET M1. The turn-on resistance of the external control MOSFETs can be determined by the equation: RON=VOIP/ (2 x IT) (IT is the overcurrent threshold current). For example, if the overcurrent threshold current IT is designed to be 3A, the turn-on resistance of the external control MOSFETs must be 33m Ω. Users should be aware that turn-on resistance of the MOSFET changes with temperature variation due to heat dissipation. It changes with the voltage between gate and source as well. (Turn-on resistance of a MOSFET increases as the voltage between gate and source decreases). Once the turn-on resistance of the external MOSFET changes, the overcurrent threshold current will change accordingly. Suppressing the Ripple and Disturbance from Charger To suppress the ripple and disturbance from charger, connecting R1, C1 to VCC pin is recommended. Protection at CS pin R2 is used for latch-up protection when charger is connected under overdischarge condition and overstress protection at reverse connecting of a charger. Larger value of R2 reduces the charger leakage current in overcharge mode, but possibly disables the charge detection function after overdischarge. Resistance of 51K Ω is recommended. |
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