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DV2031S2 Datasheet(PDF) 2 Page - Texas Instruments |
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DV2031S2 Datasheet(HTML) 2 Page - Texas Instruments |
2 / 9 page Connection Descriptions TB1 DC+ Charger supply (DC) 30V MAX DC– Ground from charger supply and low sideofsystemload TB2 BAT+ Positive battery terminal BAT– Negative battery terminal TEM– Thermistor connection (negative) TEM+ Thermistor connection (positive) JP1 QSEL Charge algorithm select JP2 DSEL Display mode select JP3 TSEL Charge algorithm select JP4 IGSEL Minimum current select JP5 Number of cells Fixed Configuration The DV2031S2 board has the following fixed character- istics: VCC for the fast charge IC is regulated on-board from the supply at connector TB1. TB1 can accept a maximum of 30VDC. The minimum charging volt- age for two cells is 10VDC, and the minimum charging voltage for six cells is 22VDC. LED1 and LED2 indicate charge status. LED3 indicates a charge-pending or fault condition. Charge begins on the later application of 1. The battery 2. Supply voltage The onboard regulator supplies a fast charge cur- rent IMAX of 2.5A. The fast (bulk) charge voltage VBLK is set at 2.45V per cell (±1%) and the float voltage VFLT is set at 2.25V per cell (±1%) The number of cells can be changed within board-defined parameters, as described below in “Jumper-Selectable Configuration.” The switching frequency of the PWM control is 100kHz. The regulated current is controlled by the value of the sense resistor RSNS according to the equation I V R CHG SNS = 025 . The value of RSNS (R20 in the schematic) at ship- ment is 0.10 Ω. This resistor can be changed de- pending on the application. The suggested maxi- mum charging current IMAX for the bq2031S1 board is 2.5A with an accuracy of ±10%. The thermistor provided is the Philips 2322–640–63103. With this thermistor connected between TEM+ and TEM–, the temperature fault limits are VLTF (low temperature fault) = 0°C, VHTF (high temperature fault) = 45°C, and VTCO (charge cutoff) = 47°C. Jumper-Selectable Configuration The DV2031S2 must be configured as follows: DSEL (JP2) selects the LED display options as de- scribed in Table 1 on the following page. TSEL (JP3) and QSEL (JP1) select the charge algo- rithm as shown in Table 2 on the following page. IGSEL (JP4) sets IMIN and the Two-Step Current maintenance charge as a ratio of IMAX.ICOND = IMAX/5, as shown below: JP4 IMIN Fixed-Pulse Average Current L IMAX 10 II COND MAX 210 = H IMAX 20 II COND MAX 420 = None IMAX 30 II COND MAX 830 = As indicated in the Jumper Configuration Diagram, JP5 configures the board for the number of lead-acid cells. 2 DV2031S2 Rev. B Board |
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