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ACT2801 Arkusz danych(PDF) 11 Page - Active-Semi, Inc |
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ACT2801 Arkusz danych(HTML) 11 Page - Active-Semi, Inc |
11 / 25 page Rev 9, 14-Mar-17 Innovative PowerTM - 11 - www.active-semi.com Copyright © 2015-2017 Active-Semi, Inc. ACT2801/ACT2801B/ACT2801C Figure 2: ACT2801B/ACT2801C System Operation Flow Chart FUNCTIONAL DESCRIPTION Latch-Off ACT2801/ACT2801B has latch off function. If the IC is in boost mode and the battery voltage drops below the Boost Mode Input Voltage UVLO voltage (typ 3.3V) minus Boost Mode Input Voltage UVLO Hysteresis (typ 400mV), the IC latches into HZ Mode. This safety feature prevents excessive battery discharge. The IC only exits this mode when input power is recycled. Input Current Limit When the input current reaches the programmed value, switch Q1 goes into linear mode and output voltage starts to drop. When output voltage drops to 4.25V, hiccup mode is triggered and switch Q1 turns off and restart in 2 seconds. Switching Battery Charger ACT2801/ACT2801B is configured in charge mode (buck mode) when VIN is valid. In this mode, a battery is charged with preconditioning, fast charge, top-off and end of charge (EOC). The typical charge management is shown in Figure 3 and Figure 4. CC/CV Regulation Loop There are CC/CV regulation loops built in ACT2801/ ACT2801B, which regulates either current or voltage as necessary to ensure fast and safe charging of the battery. In a normal charge cycle, this loop regulates the current to the value set by the external resistor at the ICST pin. Charging continues at this current until the battery cell voltage reaches the termination voltage. At this point the CV loop takes over, and charge current is allowed to decrease as necessary to maintain charging at the termination voltage. Precondition Charge A new charging cycle begins with the precondition state, and operation continues in this state until VBAT exceeds the precondition threshold voltage. When operating in precondition state, the cell is charged at a reduced current, 10% of the programmed maximum fast charge constant current. Once VBAT reaches the precondition threshold voltage the state machine jumps to the fast charge state. Fast Charge If battery voltage is above preconditioning threshold, buck converter charges battery with constant current. In fast charge state, the ACT2801/ ACT2801B charges at the current set by the external resistor connected at the ICST pin. During a normal charge cycle fast charge continues in CC mode until VBAT reaches the charge termination voltage, at which point the ACT2801/ACT2801B charges in top off state. Top Off With the battery voltage approaches the EOC voltage set by the BTV pin. Charge current decreases as charging continues. In the top off state, the cell is charged in constant voltage (CV) mode. During a normal charging cycle charging proceeds until the charge current decreases below the end of charge (EOC) threshold, defined as 13% of fast charge current. When this happens, the state machine terminates the charge cycle and jumps to the EOC state. Charge Mode (4.5V<VIN<5.5V) Boost Mode (VOUT=5V) LED Charge Status and Battery Level Indication HZ Mode (Ibat<10µA) Taking 2s VIN Invalid and HZ=0 VIN Valid Taking 2s Flashlight On PB is pressed for 3s (VIN Valid) PB is pre ssed for 3s PB is press ed fo r 30m s whe n HZ =0 Boost LED Battery Level Indication Always on |
Podobny numer części - ACT2801_17 |
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Podobny opis - ACT2801_17 |
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