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參數(shù)資料
| 型號： | FAN5242QSCX |
| 文件頁數(shù)： | 7/20頁 |
| 文件大?。?/td> | 123K |
| 代理商： | FAN5242QSCX |
FAN5201
7
P
Applications Discussion
Overview
The FAN5201 contains three control loops: a voltage-regula-
tion loop, a current-regulation loop and a power-regulation
loop. All three loops operate independently of each other.
They are or’red internally to optimize the battery charging
while the notebook is drawing power in its normal operation.
The voltage-regulation loop monitors the battery to ensure
that its voltage is held at the voltage set point (V0). The cur-
rent-regulation loop monitors current delivered to the battery
to ensure that it regulates at the current-limit set point (I0).
The power-regulation loop monitors total input power, to
both the battery and the notebook, to ensure that total power
drawn from the charger never exceeds the maximum power
set point (P0). Assuming that there is adequate power avail-
able from the charger, the current-regulation loop is in con-
trol as long as the battery voltage is below V0. When the
battery voltage reaches V0, the current loop no longer regu-
lates, and the voltage-regulation loop takes over. If on the
other hand there is not adequate power available from the
charger, the power-regulation loop is in control, and limits the
charging of the battery in order to guarantee enough power for
the notebook. Figure 2 shows the V-I-P characteristic at the
battery.
Setting V0, I0 and P0
The FAN5201’s voltage-, current-, and power-limits can be
set via the Intel System Management Bus (SMBus) 2-wire
serial interface. The FAN5201’s logic interprets the serial-
data stream from the SMBus interface to set internal digital-
to-analog converters (DACs) appropriately. See the
FAN5201 Logic section and SMBus Interface Specification
for more information.
Analog Section
The FAN5201analog section consists of 1) three transcon-
ductance error amplifiers, one for regulating current, one for
regulating voltage, and one for regulating system power, 2)
a PWM controller, with its associated gate drivers, and 3)
miscellaneous control and reference functions, consisting of
an AC present signal, 5V reference, inrush current limiter,
reverse feed protection, and a soft start circuit.
The FAN5201 uses DACs to set the current, voltage and
power levels, which are controlled via the SMBus interface.
Since separate amplifiers are used for each of these controls,
each of the control loops can be compensated separately for
optimum stability and response in each state.
Whether the FAN5201 is controlling the voltage, current or
power at any time depends on the battery’s state. If there is
adequate power available from the charger, and if the battery
has been discharged, the FAN5201’s output reaches the cur-
rent-regulation limit before the voltage limit, causing the sys-
tem to regulate current. As the battery charges, the voltage
rises until the voltage limit is reached, and the charger
switches to regulating voltage. On the other hand, if there is
not enough power available for both the notebook and the bat-
tery charging, the FAN5201 regulates charging current at
such a level as to respect the maximum power limit. When
the voltage limit is reached, the charger will similarly switch to
regulating voltage. The transitions from current to voltage
regulation, or from power to voltage regulation, are done by
the charger, and need not be controlled by the host.
Figure 2. V-I-P Characteristic of FAN5201. If power is available, the battery is charged at a rate I0 until it reaches V0.
As power becomes limiting, the charge current is reduced.
Battery
Voltage
V
O
I
O
Average Current
Through the
Resistor Between
IFB andBAT
VO = Voltage Setpoint
IO = Current Setpoint
PO = Power Setpoint
PO Limited
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| FAN5250QSC | 功能描述:DC/DC 開關(guān)控制器 DC/DC RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
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