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ACT2823 データシート(PDF) 14 Page - Active-Semi, Inc |
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ACT2823 データシート(HTML) 14 Page - Active-Semi, Inc |
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14 / 25 page  ACT2823 REV 1, 01-DEC-2016 Innovative PowerTM ActiveSwitcherTM is a trademark of Active-Semi. 14 Discharge Mode In Discharge Mode, the ACT2823 turns off Q1 and reconfigures Q2 and Q3 as a buck converter. It powers the VOUT pin from the battery. The default VOUT voltage is 5.07V and current limit is set at 3.3A. If a charged battery is present when input power is removed, the IC enters Discharge Mode. There is a 2s transition between Charge Mode and Discharge Mode. During this time, the IC goes into HZ mode. HZ Mode HZ mode is a low power mode that minimizes current draw from the battery. All switches are turned off, and only the push button circuit is kept alive. The IC draws less than 10uA current from VBAT in HZ Mode. The IC transitions from Discharge Mode to HZ Mode when the load current is less than 10mA for greater than 12.5s or when the pushbutton is pressed for greater than 5s. The IC also enters HZ Mode when a battery fault is detected. The IC stays in HZ Mode indefinitely until input voltage is applied. When input voltage is applied and there are no faults, it enters Charge Mode. The user can force a transition from HZ Mode to Discharge Mode by asserting the push button for greater than 40ms. Push Button The ACT2823 push button serves several purposes. It can be automatically pulled low when a shielded cable or a portable device is connected to VOUT. When in HZ Mode, and PB is pulled low for greater than 40ms, it turns on the LEDs for 5s and the IC transitions to Discharge Mode. This allows the user to wake up the IC to power a portable device. The PB falling threshold is 0.95V when in HZ Mode. When in Charge Mode, pulling PB below 3.5V tells the IC that a shielded USB cable or a downstream portable device is connected to VOUT. This changes the Charge Current Foldback Voltage threshold from 4.7V to 4.92V. Increasing this threshold gives more current priority to the portable device connected to VOUT. If the portable device is removed and PB rises above 3.5V, the Current Foldback Threshold drops back to 4.7V. Figure 8 shows the recommended circuit for automatically detecting the shielded cable or portable device connection. R26, R14 and C16 form the detection circuit. Connect R14 and C16 to the USB output connector shield to detect the insertion of a shielded cable. Connect to the USB cable’s output voltage to detect insertion of a portable device. LED Indication ACT2823 has 4 LED inputs to visually communicate the battery status. A resistor from PT to AGND programs the LED mode. In all modes, when the battery is discharging, LED1 flashes to indicate a low battery when the battery voltage is lower than the VLED1 threshold. In all modes, all LEDs turn on solid when the battery charger is in the End-of-Charge Mode. Conventional – Always On Mode Setting RPT=4kΩ programs Conventional – Always On Mode. The LEDs are always active when the IC is in Charge or Discharge Mode. The LEDs are solid to indicate Charge Mode and flash to indicate Discharge Mode. Figure 4 shows each LED function relative to the VBAT voltage. Conventional Mode Setting RPT=12kΩ programs Conventional Mode. The LEDs are always active when the IC is in Charge Mode. They only turn on for 5s when PB is pulled low for greater than 40ms in Discharge Mode. The LED pattern is identical to Conventional – Always On Mode. Figure 4 shows each LED function relative to the VBAT voltage. Breathing Mode Setting RPT=24kΩ programs Breathing Mode. The LEDs are always active when the IC is in Charge Mode. They only turn on for 5s when PB is pulled low for greater than 40ms in Discharge Mode.In Charge Mode, the LEDs appear to “breath” as the IC ramps the current back and forth between 0mA and 3mA at a 2s rate. In Discharge mode, the LED pattern is identical to Conventional Mode. Figure 4 shows each LED function relative to the VBAT voltage. Bottom Charging Mode Setting RPT=40kΩ programs Bottom Charging Mode. The LEDs are always active when the IC is in Charge Mode. They only turn on for 5s when PB is pulled low for greater than 40ms in Discharge Mode. In Charge Mode, the LED cycle starts with all LEDs off. LED1 turns on, then LED2 turns on, etc. until the highest LED corresponding to the battery voltage turns on. Then all LEDs turn off. This cycle repeats every 0.5s. In Discharge mode, the LED pattern is identical to Conventional Mode. Figure 4 shows each LED function relative to the VBAT voltage. Circulating Mode Setting RPT greater than 56kΩ programs Circulating Mode. RPT can be left open to program Circulating Mode.The LEDs are always active when the IC is in Charge Mode. They only turn on for 5s when PB is pulled low for greater than 40ms in Discharge Mode. In Charge Mode, when the battery voltage is over an LED’s threshold, that LED stays on. The higher threshold LEDs turn on one at a time until they are all on. They then turn off. The cycle repeats every 0.5s. In Discharge mode, the LED pattern is identical to Conventional Mode. Figure 4 shows each LED function relative to the VBAT voltage. LED1-4 Refresh Cycle Every time VIN is applied or PB is pulled low, the LEDs |
同様の部品番号 - ACT2823 |
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同様の説明 - ACT2823 |
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