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FP6711 Datasheet(PDF) 9 Page - Fitipower Integrated Technology Inc.

Part # FP6711
Description  High-Efficiency, 1-Cell and 2-Cell Boost Converter
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Manufacturer  FITIPOWER [Fitipower Integrated Technology Inc.]
Direct Link  http://www.fitipower.com/en_US/index.asp
Logo FITIPOWER - Fitipower Integrated Technology Inc.

FP6711 Datasheet(HTML) 9 Page - Fitipower Integrated Technology Inc.

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9
FP6711-1.4-DEC-2011
FP6711
85T
fitipower integrated technology lnc.
Application Information
Controller Circuit
The device is based on a current-mode control
topology
and
uses
a
constant
frequency
pulse-width modulator to regulate the output
voltage.
The controller limits the current through
the power switch on a pulse by pulse basis.
The
current sensing circuit is integrated in the device;
therefore, no additional components are required.
Due to the nature of the boost converter topology
used here, the peak switch current is the same as
the peak inductor current, which will be limited by
the integrated current limiting circuits under normal
operating conditions.
The control loop must be externally compensated
with an R-C network connected to the COMP pin.
Synchronous Rectifier
The device integrates an N-channel and a P-
channel
MOSFET
transistor
to
realize
a
synchronous rectifier.
There is no additional
Schottky diode required.
Because the device
uses a integrated low RDS(ON) PMOS switch for
rectification,
the
power
conversion
efficiency
reaches 94%.
A special circuit is applied to disconnect the load
from the input during shutdown of the converter.
In conventional synchronous rectifier circuits, the
backgate diode of the high-side PMOS is forward
biased in shutdown and allows current flowing from
the battery to the output.
This device, however,
uses a special circuit to disconnect the backgate
diode of the high-side PMOS and so, disconnects
the output circuitry from the source when the
regulator is not enabled (EN = low).
PFM Mode
The FP6711 is designed for high efficiency over a
wide output current range.
Even at light load, the
efficiency stays high because the switching losses
of the converter are minimized by effectively
reducing the switching frequency.
The controller
will enter a power saving mode if certain conditions
are met.
In this mode, the controller only switches
on the transistor if the output voltage trips below a
set threshold voltage.
It ramps up the output
voltage with one or several pulses, and goes again
into PFM mode once the output voltage exceeds a
set threshold voltage.
Device Enable
The device will be shut down when EN is set to
GND.
In this mode, the regulator stops switching,
all internal control circuitry including the low-battery
comparator will be switched off, and the load is
disconnected from the input (as described in above
synchronous rectifier section).
This also means
that the output voltage may drop below the input
voltage during shutdown.
The device is put into operation when EN is set
high.
During start-up of the converter, the duty
cycle is limited in order to avoid high peak currents
drawn from the battery.
The limit is set internally
by the current limit circuit and is proportional to the
voltage on the COMP pin.
Under-Voltage Lockout
Under-voltage lockout function prevents the device
from starting up if the supply voltage on VBAT is
lower than approximately 0.7V.
This under-voltage
lockout function is implemented in order to prevent
the malfunctioning of the converter.
When the
battery
is
being
discharged,
the
device
will
automatically enter the shutdown mode if the
voltage on VBAT drops below approximately 0.7V.


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