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BQ24725ARGRR Datasheet(PDF) 35 Page - Texas Instruments |
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BQ24725ARGRR Datasheet(HTML) 35 Page - Texas Instruments |
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35 / 47 page  VCC BATDRV REGN BTST HIDRV PHASE LODRV GND SRP SRN Q4 Sis412DN L1 4.7µH SYSTEM C10 10µF RSR 10m? R1 430 kW R2 66.5 kW C2 0.1µF U1 bq24725A C8 10uF Q3 Sis412DN Q5 (BATFET) FDS6680A C7 0.047µF Adapter + RAC 10 mW Pack + C6 1µF HOST Dig I/O SMBus +3.3V C4 100 pF R4 R5 R7 549 kW ACN ACP CMSRC ACDRV ACDET ILIM SDA SCL ACOK IOUT Ci 2.2µF Ri 2 ? R9 10 R3 10 kW R8 100 kW R10 4.02 kW R11 D1 BAT54 C9 10uF C11 10µF Pack - C3 0.1µF C5 1µF R6 4.02 kW C1 0.1µF Total Csys 220µF C15 0.01µF C16 0.1µF C17 2200 pF Adapter - ADC Q1 (ACFET) FDS6680A D3 PDS1040 PowerPad C13 0.1µF C14 0.1µF R14 10 Ω R15 7.5 Ω * * 4.02 kW 10 kW 10 kW * * * V = 20 V, F = 750 kHz, L = 4.7 H IN m 88 89 90 91 92 93 94 95 96 97 98 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 Charge Current 4-cell 16.8 V 3-cell 12.6 V 2-cell 8.4 V bq24725A www.ti.com SLUSAL0A – SEPTEMBER 2011 – REVISED AUGUST 2014 9.3 Application Curves CH1: PHASE, 20V/div, CH2: battery voltage, 5V/div CH3: LODRV, 10V/div CH4: inductor current, 2A/div, 400us/div Figure 24. Efficiency vs Output Current Figure 23. Battery Insertion 9.4 System Examples Fs = 750kHz, IADPT = 2.816A, ICHRG = 1.984A, ILIM = 2.54A, VCHRG = 12.592V, 65W adapter and 3S2P battery pack Use 0 Ω for better current sensing accuracy, use 10Ω/7.5Ω resistor for reversely battery connection protection. See application information about negative output voltage protection for hard shorts on battery to ground or battery reversely connection. The total Csys is the lump sum of system capacitance. It is not required by charger IC. Use Ri and Ci for adapter hot plug in voltage spike damping. See application information about input filter design. Figure 25. Typical System Schematic with One NMOS Selector and Schottky Diode Copyright © 2011–2014, Texas Instruments Incorporated Submit Documentation Feedback 35 Product Folder Links: bq24725A |
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