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ACT2861QI Arkusz danych(PDF) 41 Page - Active-Semi, Inc |
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ACT2861QI Arkusz danych(HTML) 41 Page - Active-Semi, Inc |
41 / 91 page ACT2861QI Rev 2.0, 27-Apr-2018 Innovative PowerTM www.active-semi.com ActiveSwitcherTM is a trademark of Active-Semi Copyright © 2018 Active-Semi, Inc. 41 Table 6: Fast Charge Safety Timer Response Condition Charge Response Fast Charge Safety Timer Speed Normal Fast Charge NONE Full Speed VIN Input Regulation Reduced Charge Current ½ Speed IIN Input Current Regulation Reduced Charge Current ½ Speed Thermal Die Regulation Reduced Charge Current ½ Speed Battery Temp Exceed Limits Suspend Charge Suspend Battery Temp Hot or Cold Reduced Charge Current or VTERM ½ Speed Table 7: Low Battery Safety Timer Response Condition Charge Response Low Battery Safety Timer Speed Normal SCOND or PCOND Charge NONE Full Speed VIN Input Regulation Reduced Charge Current ½ Speed IIN Input Current Regulation Reduced Charge Current ½ Speed Thermal Die Regulation Reduced Charge Current ½ Speed Battery Temp Exceeds JEITA T0 or T6 Limits Suspend Charge Suspend Battery Temp Exceeds JEITA T1- T2 or T3-T5 Limits NONE Full Speed Safety Timer Configuration Change When the safety timer value needs to be changed, it is recommended that the timer is first disabled. Then change the FC_SAFETY_TIMER[4:0] register. Disable the safety timer by writing a 1 into I2C bit DIS_SAFETY_TIMER in register 0x1Bh. This proce- dure ensures the safety timer properly restarts after new value is configured. Charger – Input Capacitor Selection Note that the Charger CIN capacitors are also the OTG output capacitors. They are connected to VIN. The input capacitance should be a combination of ceramic and bulk capacitance. If the design only uses Charge mode and does not use OTG mode, 22uF to 47uF capacitors are typically ac- ceptable, but the final value is application dependent. Choose the input capacitor value to keep the input volt- age ripple less than ~50mV. The input capacitance can be increased without limit. C _ I ∗ ∗ ∗ Where CCHG_IN is the charging input capacitance (OTG output capacitance) in uF, ICHG is the charging current in Amperes, VBAT is the battery voltage in volts, VIN is the input voltage in volts, FSW is the switching frequency in Hz, and Vripple is the maximum input voltage ripple in volts. An additional 100uF bulk electrolytic capacitor is recom- mended. If the design uses OTG Mode, refer to the OTG Output Capacitor Selection. The OTG Mode capacitor require- ments take precedence over Charging input capaci- tance. Be sure to consider the input capacitor’s DC bias effects. A capacitor’s actual capacitance is strongly affected by its DC bias characteristics. The input capacitor is typi- cally an X5R, X7R, or similar dielectric. Use of Y5U, Z5U, or similar dielectrics is not recommended. |
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