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SS6821-CCVTR Datasheet(PDF) 8 Page - Silicon Standard Corp. |
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SS6821-CCVTR Datasheet(HTML) 8 Page - Silicon Standard Corp. |
8 / 10 page www.SiliconStandard.com 8 of 10 SS6821 DESIGN GUIDE Selection of external control MOSFETs Because the over-current protection voltage is pre-set, the threshold current for over-current detection is determined by the on-resistance of the discharge control MOSFET M1. The required on-resistance of the external control MOSFETs can be determined by the equation: RON=VOIP/ (2 x IT) (IT is the over-current threshold current). For example, if the over- current threshold current IT is designed to be 3A, the on-resistance of the external control MOSFETs must be 33m Ω. Users should be aware that on-resistance of the MOSFET changes with temperature variation due to heat dissipation. It changes with the voltage between gate and source as well. (On- resistance of a MOSFET increases as the voltage between gate and source decreases). Once the on-resistance of the external MOSFET changes, the over-current threshold current will change accordingly. Suppressing the ripple and disturbance from the charger To suppress the ripple and disturbance from the charger, connecting R1, C1 to the VCC pin is recommended. Protection at CS pin R2 is used for latch-up protection when the charger is connected under an over-discharge condition, and over-stress protection for accidental reverse-connection of the charger. A larger value of R2 reduces the charger leakage current in over-charge mode, but may possibly disable the charge detection function after over- discharge. A resistance value of 100K Ω is recommended. 12/6/2004 Rev.2.02 |
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