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AIC1803BCS Datasheet(PDF) 10 Page - Analog Intergrations Corporation |
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AIC1803BCS Datasheet(HTML) 10 Page - Analog Intergrations Corporation |
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10 / 12 page  AIC1803 10 C TC ‚CTD(F) 1n 5n 10n 22n 33n T OC ‚T OD(S) 21m 52m 132m 253m 347m C TC ‚CTD(F) 47n 68n 82n 100n T OC ‚T OD(S) 617m 748m 1004m 1630m The delay time can also be approximately calculated by the following equations (if C TC , CTD ≤ 82nF) : T OC (mS) = 11.8 x CTC(nF) T OD (mS) = 11.8 x CTD(nF) Setting the Overcurrent Delay Time 1 The overcurrent delay time 1 (T OI1) at 0.15V < V CC-VCS < 0.3V is set by the external capacitor CTI, while the overcurrent delay time 2 and 3 (T OI2 and T OI3) is fixed by IC internal circuit.The relationship between capacitance of the external capacitor and delay time is tabulated as below. C TI(F) 1n 2.2n 3.3n 5n 6.8n 10n T OI(mS) 4.8 15.0 18.8 23.6 31.0 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: R ON=V OIP/IT (IT is the overcurrent threshold current). For example, if the overcurrent threshold current I T 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. 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. |
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