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参数资料
| 型号： | PS200-I/SS |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDSO20 |
| 封装： | 5.30 MM, PLASTIC, MO-150, SSOP-20 |
| 文件页数： | 36/36页 |
| 文件大小： | 537K |
| 代理商： | PS200-I/SS |
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2005 Microchip Technology Inc.
DS21891B-page 7
PS200
2.2
Lithium Charging
To ensure the proper treatment of lithium chemistries
during extreme temperature and voltage conditions,
multi-step charging is required. The PS200 measures
key voltage, temperature and time parameters. It com-
pares them to user defined voltage, temperature and
time limits. These limits are described in Section 2.4
2.2.1
CHARGE PENDING STATE –
BEGINNING THE CHARGE CYCLE
The PS200 is initially set in the Charge Pending state
(A). In this state, the presence of a battery pack must
be sensed in order to begin the charging cycle. The
PS200 comes up in the Charge Pending state, after a
Reset, independent of the previous state.
2.2.2
CHARGE QUALIFICATION STATE
During charge qualification, the battery’s temperature
and voltage are measured to determine the next
charging state. There are four possible next states (see
1.
If the battery’s temperature is outside of the
limits for charge initiation (TMAX, TMIN) then the
next state is Charge Suspend (C).
2.
If the battery’s voltage is less than the minimum
voltage for charge initiation (VMIN) and its
temperature is within the limits for charge
initiation (TMAX, TMIN), then the next state is
Precharge (D).
3.
If the battery’s voltage is above the minimum
voltage for charge initiation (VMIN) and its tem-
perature is within the limits for charge initiation
(TMAX, TMIN), then the next state is Current
Regulation (E).
4.
If the battery’s voltage is above the voltage at
which charging will restart (VRCHG), then the
next state is Charge Complete (G).
2.2.3
PRECHARGE STATE
The Precharge state allows for the recovery of a deeply
discharged battery pack by applying a low charge rate.
In this state, a user configured precharge current is
applied to the battery, resulting in an increase in the
battery’s voltage (refer to Figure 2-2). There are three
possible next states (see Figure 2-1).
1.
If the battery’s voltage is above the minimum
voltage for charge initiation (VMIN) and the
battery’s temperature is within the limits for
charge initiation (TMAX, TMIN), then the next state
is Current Regulation (E).
2.
If the Precharge state time limit is exceeded (tp)
and the battery’s voltage remains less than the
minimum voltage for charge initiation (VMIN),
then the next state is Charge Suspend (C).
If the Precharge state time limit is exceeded (tp)
and the battery’s temperature is greater than the
maximum temperature for charge initiation (TMAX),
then the next state is Charge Suspend (C).
If the Precharge state time limit is exceeded (tp)
and the battery’s temperature is less than the
minimum temperature for charge initiation (TMIN),
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.
2.2.4
CHARGE SUSPEND STATE
In the Charge Suspend state, no current is applied to
the battery pack. There are two possible next states
(see Figure 2-1).
1.
If the battery’s temperature is within the limits for
charge initiation (TMAX, TMIN) and its voltage is
less than the voltage at which charging would
restart (VRCHG), then the next state is Precharge
(D).
2.
If the battery pack is taken away (BATPRES = 0),
then the PS200 enters the Charge Pending (A)
state.
Note:
Refer to Figure 2-1 and Figure 2-2 for
clarification when reading this section.
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