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BQ24725ARGRR Datasheet(PDF) 24 Page - Texas Instruments |
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BQ24725ARGRR Datasheet(HTML) 24 Page - Texas Instruments |
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24 / 47 page  ( ) ILIM SRP SRN CHG SR V = 20 × V V = 20 I R - ´ ´ bq24725A SLUSAL0A – SEPTEMBER 2011 – REVISED AUGUST 2014 www.ti.com The SRP and SRN pins are used to sense RSR with default value of 10mΩ. However, resistors of other values can also be used. For a larger sense resistor, a larger sense voltage is given, and a higher regulation accuracy; but, at the expense of higher conduction loss. If the current sensing resistor value is too high, it may trigger an over current protection threshold because the current ripple voltage is too high. In such a case, either a higher inductance value or a lower current sensing resistor value should be used to limit the current ripple voltage level. A current sensing resistor value no more than 20m Ω is suggested. To provide secondary protection, the bq24725A has an ILIM pin with which the user can program the maximum allowed charge current. Internal charge current limit is the lower one between the voltage set by ChargeCurrent(), and voltage on ILIM pin. To disable this function, the user can pull ILIM above 1.6V, which is the maximum charge current regulation limit. Equation 2 shows the voltage set on ILIM pin with respect to the preferred charge current limit: (2) Figure 15. Charge Current Register (0x14H), Using 10m Ω Sense Resistor 15 14 13 12 11 10 9 8 Not in use Not in use Not in use Charge Charge Charge Charge Charge Current, Current, Current, Current, Current, DACICHG 6 DACICHG 5 DACICHG 4 DACICHG 3 DACICHG 2 R/W R/W R/W R/W R/W R/W R/W 7 6 5 4 3 2 1 0 Charge Charge Not in use Not in use Not in use Not in use Not in use Not in use Current, Current, DACICHG 1 DACICHG 0 R/W R/W R/W R/W R/W R/W R/W R/W LEGEND: R/W = Read/Write; R = Read only; -n = value after reset Table 4. Charge Current Register (0x14H), Using 10m Ω Sense Resistor Bit Field Type Reset Description [15] Not in use R/W Not used. [14] Not in use R/W Not used. [13] Not in use Not used. [12] Charge Current, DACICHG 6 R/W 0 = Adds 0mA of charger current. 1 = Adds 4096mA of charger current. [11] Charge Current, DACICHG 5 R/W 0 = Adds 0mA of charger current. 1 = Adds 2048mA of charger current. [10] Charge Current, DACICHG 4 R/W 0 = Adds 0mA of charger current. 1 = Adds 1024mA of charger current. [9] Charge Current, DACICHG 3 R/W 0 = Adds 0mA of charger current. 1 = Adds 512mA of charger current. [8] Charge Current, DACICHG 2 R/W 0 = Adds 0mA of charger current. 1 = Adds 256mA of charger current. [7] Charge Current, DACICHG 1 R/W 0 = Adds 0mA of charger current. 1 = Adds 128mA of charger current. [6] Charge Current, DACICHG 0 R/W 0 = Adds 0mA of charger current. 1 = Adds 64mA of charger current. [5] Not in use R/W Not used. [4] Not in use R/W Not used. [3] Not in use R/W Not used. [2] Not in use R/W Not used. [1] Not in use R/W Not used. [0] Not in use R/W Not used. 24 Submit Documentation Feedback Copyright © 2011–2014, Texas Instruments Incorporated Product Folder Links: bq24725A |
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