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UCC3957-1 Datasheet(PDF) 10 Page - Texas Instruments |
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UCC3957-1 Datasheet(HTML) 10 Page - Texas Instruments |
10 / 17 page UCC39571, UCC39572, UCC39573, UCC39574 SLUS236B – JANUARY 1999 – REVISED SEPTEMBER 2002 10 www.ti.com APPLICATION INFORMATION controlling discharge FET turn-on and turn-off times Figure 3 shows a four-cell protector with slew-rate limiting the discharge FET. In this application, VR1 and R2 are optional, They protect Q1 from excessive open-circuit charger voltage. R3 and C6 are chosen based on capacitive load that must be driven. R4 minimizes inductive kick at turn-off. UDG–98018 1 3 2 4 DVDD VDD CLCNT WU AN1 AN2 AN3 AN4 BATLO CHGEN AN4 CHG CDLY2 AVDD CDLY1 5 7 6 8 16 14 15 13 12 10 11 9 C3 OPTIONAL + + + PACK (–) PACK (+) Q1 IFR7416 CHARGE Q2 IFR7416 DISCHARGE LI–ION BATTERY STACK + VR1 18 V D1 1 A, 50 V Q3 2N7002 R2 10 k Ω C1 0.1 µF C2 0.1 µF C5 4.7 µF 25 V C4 0.022 µF RSENSE 0.025 Ω R1 1 M Ω R3 1 k Ω C6 0.22 µF R4 100 Ω DCHG Figure 3. Four-Cell Lithium-Ion Protector Application Diagram Not Recommended for New Designs |
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