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參數(shù)資料
| 型號(hào)： | LTC4412IS6#TRM |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO6 |
| 封裝： | 1 MM HEIGHT, PLASTIC, MO-193, TSOT-23, 6 PIN |
| 文件頁(yè)數(shù)： | 9/12頁(yè) |
| 文件大小： | 155K |
| 代理商： | LTC4412IS6#TRM |
6
LTC4412
4412fa
OPERATIO
U
Operation can best be understood by referring to the Block
Diagram, which illustrates the internal circuit blocks along
with the few external components, and the graph that
accompanies Figure 1. The terms primary and auxiliary are
arbitrary and may be changed to suit the application.
Operation begins when either or both power sources are
applied and the CTL control pin is below the input low
voltage of 0.35V (VIL). If only the primary supply is
present, the Power Source Selector will power the LTC4412
from the VIN pin. Amplifier A1 will deliver a current to the
Analog Controller block that is proportional to the voltage
difference in the VIN and SENSE pins. While the voltage on
SENSE is lower than VIN – 20mV (VFR), the Analog
Controller will instruct the Linear Gate Driver and Voltage
Clamp block to pull down the GATE pin voltage and turn on
the external P-channel MOSFET. The dynamic pull-down
current of 50
μA (IG(SNK)) stops when the GATE voltage
reaches ground or the gate clamp voltage. The gate clamp
voltage is 7V (VG(ON)) below the higher of VIN or VSENSE.
As the SENSE voltage pulls up to VIN – 20mV, the LTC4412
will regulate the GATE voltage to maintain a 20mV differ-
ence between VIN and VSENSE which is also the VDS of the
MOSFET. The system is now in the forward regulation
mode and the load will be powered from the primary
supply. As the load current varies, the GATE voltage will be
controlled to maintain the 20mV difference. If the load
current exceeds the P-channel MOSFET’s ability to deliver
the current with a 20mV VDS the GATE voltage will clamp,
the MOSFET will behave as a fixed resistor and the forward
voltage will increase slightly. While the MOSFET is on the
STAT pin is an open circuit.
When an auxiliary supply is applied, the SENSE pin will be
pulled higher than the VIN pin through the external diode.
The Power Source Selector will power the LTC4412 from
the SENSE pin. As the SENSE voltage pulls above VIN –
20mV, the Analog Controller will instruct the Linear Gate
Driver and Voltage Clamp block to pull the GATE voltage up
to turn off the P-channel MOSFET. When the voltage on
SENSE is higher than VIN + 20mV (VRTO), the Analog
Controller will instruct the Linear Gate Driver and Voltage
Clamp block to rapidly pull the GATE pin voltage to the
SENSE pin voltage. This action will quickly finish turning
off the external P-channel MOSFET if it hasn’t already
turned completely off. For a clean transistion, the reverse
turn-off threshold has hysteresis to prevent uncertainty.
The system is now in the reverse turn-off mode. Power to
the load is being delivered through the external diode and
no current is drawn from the primary supply. The external
diode provides protection in case the auxiliary supply is
below the primary supply, sinks current to ground or is
connected reverse polarity. During the reverse turn-off
mode of operation the STAT pin will sink 10
μA of current
(IS(SNK)) if connected. Note that the external MOSFET is
wired so that the drain to source diode will momentarily
forward bias when power is first applied to VIN and will
become reverse biased when an auxiliary supply is ap-
plied.
When the CTL (control) input is asserted high, the external
MOSFET will have its gate to source voltage forced to a
small voltage VG(OFF) and the STAT pin will sink 10μA of
current if connected. This feature is useful to allow control
input switching of the load between two power sources as
shown in Figure 4 or as a switchable high side driver as
shown in Figure 7. A 3.5
μA internal pull- down current
(ICTL) on the CTL pin will insure a low level input if the pin
should become open.
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| LTC4412IS6TRMPBF | 制造商:Linear Technology 功能描述:PowerPath Controller Low-Loss TSOT23-6 |
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