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SS6804 Datasheet(PDF) 10 Page - Silicon Standard Corp. |
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SS6804 Datasheet(HTML) 10 Page - Silicon Standard Corp. |
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10 / 12 page  www.SiliconStandard.com 10 of 12 SS6804 The delay time can also be approximately calculated by the following equations (if CTC, CTD ≤ 82nF) : TOC(mS) = 11.8 x CTC(nF) TOD(mS) = 11.8 x CTD(nF) Setting the Overcurrent Delay Time 1 The overcurrent delay time 1 (TOI1) at 0.15V < VCC-VCS < 0.3V is set by the external capacitor CTI, while the overcurrent delay time 2 and 3 (TOI2 and TOI3) is fixed by IC internal circuit.The relationship between capacitance of the external capacitor and delay time is tabulated as below. CTI (nF) TOI (ms) 1 4.8 2.2 15.0 3.3 18.8 5 23.6 6.8 31.0 10 61.8 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/IT (IT is the overcurrent threshold current). For example, if the overcurrent threshold current IT is designed to be 5A, the turn-on resistance of the external control MOSFETs must be 30m 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 to R4 and C1 to C4 is recommended. Larger R1 will cause larger error of battery sense voltage. Controlling the Charge Control MOSFET R5, R6, R7 and NPN transistor Q1 are used to switch the charge control MOSFET M2. If overcharge does not occur, no current flows into OC pin and Q1 is turned off, then M2 is turned on. When overcharge occurs, current flows into OC pin and Q1 is turned on, which turns off M2 in turn. Protection at CS Pin R8 is used for protection of IC when charger is connected in reverse. The charge detection function after overdischarge is possibly disabled by larger value of R8. Resistance of 1K Ω is recommended. 12/29/2003 Rev.2.02 |
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