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Zakładka z wyszukiwarką danych komponentów |
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Zakładka z wyszukiwarką danych komponentów |
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LTC4085 Arkusz danych(PDF) 14 Page - Linear Technology |
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LTC4085 Arkusz danych(HTML) 14 Page - Linear Technology |
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14 / 24 page  LTC4085 14 4085fc USB Current Limit and Charge Current Control The current limit and charger control circuits of the LTC4085 are designed to limit input current as well as control battery charge current as a function of IOUT. The programmed current limit, ICL, is defined as: I R V V R CL CLPROG CLPROG CLPROG = ⎛ ⎝⎜ ⎞ ⎠⎟ = 1000 1000 • The programmed battery charge current, ICHG, is defined as: I R V V R CHG PROG PROG PROG = ⎛ ⎝⎜ ⎞ ⎠⎟ = 50 000 50 000 , • , Input current, IIN, is equal to the sum of the BAT pin output current and the OUT pin output current: IIN = IOUT + IBAT The current limiting circuitry in the LTC4085 can and should be configured to limit current to 500mA for USB applica- tions (selectable using the HPWR pin and programmed using the CLPROG pin). The LTC4085 reduces battery charge current such that the sum of the battery charge current and the load current does not exceed the programmed input current limit (one- fifth of the programmed input current limit when HPWR is low, see Figure 2). The battery charge current goes to zero when load current exceeds the programmed input current limit (one-fifth of the limit when HPWR is low). If the load current is greater than the current limit, the output voltage will drop to just under the battery voltage where the ideal diode circuit will take over and the excess load current will be drawn from the battery. (2a) High Power Mode/Full Charge RPROG = 100k and RCLPROG = 2k (2b) Low Power Mode/Full Charge RPROG = 100k and RCLPROG = 2k (2c) High Power Mode with ICL = 500mA and ICHG = 250mA RPROG = 100k and RCLPROG = 2k Figure 2: Input and Battery Currents as a Function of Load Current OPERATION ILOAD (mA) 0 300 400 600 500 IIN 400 4085 F02a 200 100 –100 0 100 200 300 600 500 ILOAD IBAT CHARGING IBAT (IDEAL DIODE) ILOAD (mA) 0 300 400 600 500 IIN 400 4085 F02c 200 100 –100 0 100 200 300 600 500 ILOAD IBAT CHARGING IBAT (IDEAL DIODE) IBAT = ICHG IBAT = ICL – IOUT ILOAD (mA) 0 60 80 120 100 IIN 80 4085 F02b 40 20 –20 0 20 40 60 120 100 ILOAD IBAT CHARGING IBAT (IDEAL DIODE) |
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