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ISL9203CRZ-TR5220 Datasheet(PDF) 11 Page - Intersil Corporation |
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ISL9203CRZ-TR5220 Datasheet(HTML) 11 Page - Intersil Corporation |
11 / 14 page 11 FN9242.0 October 13, 2005 recharge threshold, VRECHRG (see Electrical Specifications). Then the STATUS pin goes low and a new charge cycle starts at point t6. The charge cycle ends at point t7 with the STATUS pin again going high, as shown in Figure 20. Internal Oscillator The internal oscillator establishes a timing reference. The oscillation period is programmable with an external timing capacitor, CTIME, as shown in Typical Applications. The oscillator charges the timing capacitor to 1.5V and then discharges it to 0.5V in one period, both with 10 µA current. The period TOSC is: (EQ. 3) A 1nF capacitor results in a 0.2ms oscillation period.The accuracy of the period is mainly dependent on the accuracy of the capacitance and the internal current source. Charge Current Programming The charge current in the CC mode is programmed by the IREF pin. The voltage of IREF is regulated to a 0.8V reference voltage. The charging current during the constant current mode is 100,000 times that of the current in the RIREF resistor. Hence, the charge current is, (EQ. 4) Table 1 shows the charge current vs. selected RIREF values. The typical trickle charge current is 10% of the programmed constant charge current. Table 2 shows the trickle charge current tolerance guidance at given RIREF values, when the battery voltage is between 0V to 2.5V. NOTE: The values in table 2 and table 1 are not tested and are only for guidance in selecting resistor values for mass production tests or in customer’s products. End-of-Charge (EOC) Current The EOC current IMIN sets the level at which the charger starts to indicate the end of the charge with the STATUS pin, as shown in Figure 20. The charger actually does not terminate charging. In the ISL9203R5220, the EOC current is internally set to 1/10 of the CC charge current, that is, (EQ. 5) At the EOC, the STATUS signal rises to HIGH and is latched. The latch is not reset until a recharge cycle or a new charge cycle starts. The tolerance guidance for the EOC current at selected RIREF values are given in Table 3. NOTE: The values in table 3 are not tested and are only for guidance in selecting resistor values for mass production tests or in customer’s products. FIGURE 20. OPERATION WAVEFORMS VIN V2P8 STATUS VBAT I CHARGE At least 15 Cycles POR Threshold 2.8V V MIN V RECHRG t 0 t 1 t2 t3 t 4 t 5 Charge Cycle Charge Cycle I MIN t 6 t 7 TOSC 0.2 10 6 CTIME ⋅ ⋅ = onds sec () IREF 0.8V RIREF ----------------- 10 5 × A () = TABLE 1. CHARGE CURRENT vs RIREF VALUES. RIREF (kΩ) CHARGE CURRENT (mA) MIN TYP MAX 267 ~ 160 17% lower than TYP Value = IREF in EQ. 5 17% higher than TYP Value 160 450 500 550 100 720 800 880 88.9 810 900 990 80 900 1000 1100 TABLE 2. TRICKLE CHARGE CURRENT vs RIREF VALUES. RIREF (kΩ) TRICKLE CHARGE CURRENT (mA) MIN TYP MAX 267 15 30 60 160 30 50 80 100 40 80 120 88.9 45 90 135 80 70 100 150 TABLE 3. EOC CURRENT vs RIREF VALUES. RIREF (kΩ) EOC CURRENT (mA) MIN TYP MAX 267 15 30 60 160 30 50 80 100 40 80 120 88.9 45 90 135 80 70 100 150 IMIN 1 10 ------ IREF ⋅ = ISL9203R5220 |
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