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UC3172AQP датащи(PDF) 5 Page - Texas Instruments

номер детали UC3172AQP
подробное описание детали  Full Bridge Power Amplifier
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производитель  TI1 [Texas Instruments]
домашняя страница  http://www.ti.com
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UC3172AQP датащи(HTML) 5 Page - Texas Instruments

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PIN DESCRIPTIONS
UC3172A
AIN: Inverting input to the A amplifier. Used as the sum-
ming node to close the loop on the overall power ampli-
fier.
AOUT: Output for the A power amplifier, providing one
end of the differential drive to the load during normal op-
eration and during park. During a UVLO condition at the
VL supply pin, this output is forced to a high, source only
state. When the UC3172A is inhibited, this output will be
set high, in a source only state.
BIN: Inverting input to the B amplifier. Used to program
the gain of the B amplifier to guarantee maximum voltage
swing to the load.
BOUT: Output for the B power amplifier, providing one
end of the differential drive to the load during normal op-
eration. During park and while inhibited this pin is tri-
stated.
COMPA: The compensation adjust pin allows the user to
provide an auxiliary compensation network for the A am-
plifier that is only active when the current sense amplifier
is in the low range. With this option, the user can control
the change in bandwidth that would otherwise result from
the gain change in the feedback loop.
CS+: The non-inverting input to the current sense ampli-
fier is typically tied to the connection between AOUT and
the series current sense resistor.
CS-: The inverting input to the current sense amplifier is
typically tied to the load side of the current sense resistor
connected in series with the load. This pin can be pulled
below ground during an abrupt load current change with
an inductive load.
CSOUT: The output of the current sense amplifier has a
1.5mA current source pull-up and an active NPN pull-
down. The output will pull to within 0.3V of either rail with
a load current of less than 1mA.
GND: Reference point for the internal reference, UV
comparator, and other low-level circuitry.
INH: A high impedance logic input that disables the A and
B power amplifiers, as well as the current sense ampli-
fier. The UV comparators and logic functions of the
UC3172A remain active. This input has an internal pull-
up that will inhibit the device if the input is left open. The
INH function is overridden by any condition that forces
the park function to be activated.
PARK: Logic input that forces the park condition on the
UC3172A. This input has an internal pull-up that will
force the park condition if the pin is left open.
PGND: Current return for all high level circuitry, this pin
should be connected to the same potential as GND.
PRKDRV: A 100mA drive output that is active low during
a park operation. This pin is normally used to supply the
low-side drive to the load during parking, in place of the
B amplifier. A series resistor can be added between this
pin and the load to limit current during park.
PWROK: Indicates with an active low condition that
either of the UV inputs are low, or that the supply voltage
at the VL input to the UC3172A has dropped below the
UVLO threshold. This output will remain active low until
the VL supply has dropped to below approximately 1.2V.
RANGE: When this pin is open or at a logic low potential,
the current sense amplifier will be in its low range mode.
In this mode the voltage gain of the current sense ampli-
fier will be 2. If this pin is brought to a logic high, the gain
of the current sense amplifier will change into its high
range value of 0.5. This factor of four change in gain will
vary the overall transconductance of the power amplifier
by the same ratio, with the transconductance being the
highest in the high mode. This feature allows improved
dynamic range of load current control for a given control
input range and resolution.
REFIN: Reference for input control signals to the power
amplifier, as well as, the non-inverting inputs to the A and
B amplifiers, and the output level shift for the CS ampli-
fier.
VC: High current supply to the collectors of the high-side
NPN output devices on the A and B amplifiers. This sup-
ply should be powered whenever the A or B amplifiers
are activated. This pin can operate approximately 400mV
below the VIN supply without affecting the voltage avail-
able to the load. This supply pin provides drive to the
power amplifiers during a parking operation.
VIN: Provides bias supply to both the power amplifiers
and the current sense amplifiers. The high-side drive to
the power stages on both the A and B amplifiers is refer-
enced to this pin. The high side saturation voltages are
specified and measured with respect to this supply pin.
The parking function of the device is fully operational in-
dependent of the voltage at this pin.
VL: Logic portions of the UC3172A are powered by this
supply pin, including the reference, UVLO, the UV com-
parators, and the PRKDRV and PWROK outputs. This
pin is a low current supply that would normally be tied to
the VC pin, or to a parking hold up capacitor for extended
parking operation with very low recovered back EMF.
5


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