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參數(shù)資料
| 型號： | LTC4085EDE-3#TRPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 電源管理 |
| 英文描述： | POWER SUPPLY MANAGEMENT CKT, PDSO14 |
| 封裝： | 4 X 3 MM, PLASTIC, MO-229, DFN-14 |
| 文件頁數(shù)： | 9/24頁 |
| 文件大?。?/td> | 275K |
| 代理商： | LTC4085EDE-3#TRPBF |
LTC4085-3
17
40853f
Programming Charge Current
The formula for the battery charge current is:
ICHG =IPROG
()50,000 =
VPROG
RPROG
50,000
where VPROG is the PROG pin voltage and RPROG is the
total resistance from the PROG pin to ground. Keep in
mind that when the LTC4085-3 is powered from the IN
pin, the programmed input current limit takes precedent
over the charge current. In such a scenario, the charge
current cannot exceed the programmed input current limit.
For example, if typical 500mA charge current is required,
calculate:
R
PROG =
1V
500mA
50,000
= 100k
For best stability over temperature and time, 1% metal
lm resistors are recommended. Under trickle charge
conditions, this current is reduced to 10% of the full-
scale value.
The Charge Timer
The programmable charge timer is used to terminate the
charge cycle. The timer duration is programmed by an
external capacitor at the TIMER pin. The charge time is
typically:
tTIMER(Hours)=
CTIMER RPROG 3Hours
0.1μF 100k
The timer starts when an input voltage greater than the
undervoltage lockout threshold level is applied or when
leaving shutdown and the voltage on the battery is less than
the recharge threshold. At power up or exiting shutdown
with the battery voltage less than the recharge threshold
the charge time is a full cycle. If the battery is greater than
the recharge threshold the timer will not start and charging
is prevented. If after power-up the battery voltage drops
below the recharge threshold or if after a charge cycle the
battery voltage is still below the recharge threshold the
charge time is set to one half of a full cycle.
The LTC4085-3 has a feature that extends charge time
automatically. Charge time is extended if the charge
current in constant-current mode is reduced due to load
current or thermal regulation. This change in charge time
is inversely proportional to the change in charge current.
As the LTC4085-3 approaches constant-voltage mode
the charge current begins to drop. This change in charge
current is due to normal charging operation and does not
affect the timer duration.
Once a time-out occurs and the voltage on the battery is
greater than the recharge threshold, the charge current
stops, and the CHRG output assumes a high impedance
state if it has not already done so.
Connecting the TIMER pin to ground disables the battery
charger.
CHRG Status Output Pin
When the charge cycle starts, the CHRG pin is pulled to
ground by an internal N-channel MOSFET capable of driving
an LED. When the charge current drops below 10% of the
programmed full charge current while in constant-voltage
mode, the pin assumes a high impedance state (but charge
current continues to ow until the charge time elapses).
If this state is not reached before the end of the program-
mable charge time, the pin will assume a high impedance
state when a time-out occurs. The CHRG current detection
threshold can be calculated by the following equation:
IDETECT =
0.1V
RPROG
50,000 =
5000V
RPROG
OPERATION
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