參數(shù)資料
型號(hào)： PS200-I/SS
元件分類(lèi)： 電源管理
英文描述： 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDSO20
封裝： 5.30 MM, PLASTIC, MO-150, SSOP-20
文件頁(yè)數(shù)： 2/36頁(yè)
文件大?。?/td> 537K
代理商： PS200-I/SS
PS200
DS21891B-page 8
2005 Microchip Technology Inc.
2.2.5
CURRENT REGULATION STATE
The Current Regulation state can be entered from the
Precharge state or Charge Qualification state. Battery
charging is initiated. This state provides constant
current, voltage limited charging (refer to Figure 2-2).
The charge current is referred to as IREG or the regula-
tion current. While the current is applied, the battery’s
voltage increases until it reaches a voltage limit
referred to as VREG or regulation voltage. Charging
continues, during which battery voltage and tempera-
ture are monitored. There are three possible next
states.
1.
If the battery’s voltage reaches or exceeds the
voltage limit, VREG and its temperature remains
below the maximum allowable during current
regulated charging (TMAXCHG), then the next
state is Voltage Regulation (F).
2.
If the battery exhibits any one of the following
conditions then the next state is Charge
Suspend (C):
- Battery voltage exceeds upper voltage limit
for charging (VMAX)
- Battery temperature exceeds upper
temperature limit for charging (TMAX)
- Battery temperature is below the lower
temperature limit for charging (TMIN)
If the time in the Current Regulation state
exceeds the time limit (ti), then the next state is
Charge Suspend (C).
3.
If the battery pack is taken away (BATPRES = 0),
then the PS200 enters the Charge Pending (A)
state.
2.2.6
VOLTAGE REGULATION STATE
Voltage Regulation provides charging at a constant
voltage while the charge current decreases (or tapers)
to the user specified minimum current threshold (IMIN).
There are three possible next states.
1.
When the charge current reaches the taper
current threshold for End-Of-Charge (IMIN) and
the battery’s voltage remains at the regulated
voltage value (VREG), then the battery has
reached the Charge Complete (G) state.
2.
If the battery exhibits any one of the following
conditions, then the next state is Charge
Suspend (C).
- Battery voltage exceeds upper voltage limit
for charging (VMAX)
- Battery temperature exceeds upper
temperature limit for charging (TMAXCHG)
If the time in the Voltage Regulation state
exceeds the time limit (tv), then the next state is
Charge Suspend (C).
3.
If the battery pack is taken away (BATPRES = 0),
then the PS200 enters the Charge Pending (A)
state.
2.2.7
CHARGE CYCLE COMPLETE STATE
The user specified minimum current threshold (IMIN)
can be configured for various charging temperatures.
At this threshold, charging is terminated and the End-
Of-Charge state is reached. The PS200 can renew the
charge cycle by entering the Charge Pending (A) state
when: 1) the battery is removed (BATPRES = 0), or 2) if
the battery’s voltage falls below the recharge threshold
voltage (VRCHG).
FIGURE 2-2:
PS200 CHARGING PROFILE
Time
Precharge
Battery Voltage
Charge Current
Current Regulation
Voltage Regulation
VREG
IREG
IMIN
Vo
lt
a
g
e
Cu
rr
ent
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