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BQ2000PN-B5 Datasheet(PDF) 10 Page - Texas Instruments |
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BQ2000PN-B5 Datasheet(HTML) 10 Page - Texas Instruments |
10 / 29 page BAT+ Q1 FMMT718 D2 ZHCS1000 L1 47 H m C9 1000PF R12 120OHMS Q2 MMBT3904LT1 C6 47 F m D5 MMSD914LT D3 MMSD914LT D4 S1A DC- R10 1KW D1 RED R2 2KW C3 10 F m D6 BZT52-C5V1 R1 100KW RC 6 LED 3 BAT 4 VSS 2 TS 5 VCC 7 SNS 1 MOD 8 U1 bq2000 C4 0.0022 F m R4 12.4K VCC C7 4.7PF C8 0.33 F m Q3 MMBT3904LT1 R11 220 W R6 210KW C5 10 F m BAT- THERM CHEMISTRY R7 200KW R9 221KW R5 20KW C1 0.1 R8 6.81KW C2 0.1 NOTES: 1.ForLi-Ion,theCHEMISTRY isleftfloating. ForNiCd/NiMH,theCHEMISTRY istiedtoBAT- 2.DCinputvoltage:9–16V 4.L1:3L GlobalP/NPKSMD-1005-470K-1A 3.Chargecurrent:1A R13 1.1K R3 0.05 W DC+ bq2000 SLUS138D – JANUARY 2008 – REVISED DECEMBER 2009 www.ti.com Figure 7. Single-Cell Li-Ion, 3-Cell NiCd/NiMH 1A Charger Minimum Current (Li-Ion Only) The bq2000 monitors the charging current during the voltage-regulation phase of Li-Ion batteries. Fast charge is terminated when the current is tapered off to 14% of the maximum charging current. Once constant-current fast charge has ended, the bq2000 either measures the value of the CMTO capacitor (in the case of Nickel batteries) and then proceeds to either top-off or trickle maintenance charge or simply completes the constant-voltage stage of fast charge (in the case of a Li-Ion cell). Top-Off and Pulse-Trickle Maintenance Charge An optional top-off charge is available for NiCd or NiMH batteries. Top-off may be desirable on batteries that have a tendency to terminate charge before reaching full capacity. To enable this option, the capacitance value of CMTO connected between the RC pin and VCC (Figure 5) should be greater than 0.13µF, and the value of the resistor connected to this pin should be less than 250k Ω. To disable top-off, the capacitance value should be less than 0.07µF. The tolerance of the capacitor needs to be taken into account in component selection. Once top-off is started, the timer is reset and top-off proceeds until the timer expires, VMCV is reached, or there is a temperature fault. During top-off, current is delivered to the battery in pulses that occur each second. The fixed pulse width allows an average current of 1/16 of the fast charge current to be delivered to the battery every second. The LED is always off during top-off and trickle maintenance charge. 10 Submit Documentation Feedback Copyright © 2008–2009, Texas Instruments Incorporated Product Folder Link(s): bq2000 |
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