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UC3173A датащи(PDF) 5 Page - Texas Instruments

номер детали UC3173A
подробное описание детали  Full Bridge Power Amplifier
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производитель  TI1 [Texas Instruments]
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UC3173A датащи(HTML) 5 Page - Texas Instruments

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5
UC3173A
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
VIN supply pin, this output is forced to a high, source
only state. When the UC3173A 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 volt-
age 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
tristated.
COMP: 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 inverting input to the current sense amplifier is
typically tied to the load side of the series current sense
resistor. This pin can be pulled below ground during an
abrupt load current change with an inductive load.
Proper operation of the current sense amplifier will result
if this pin does not go below ground by an amount
greater than: REFIN / 2 –0.3V, in low range mode, and 2
• REFIN –0.9V, in high range mode.
CS+: The noninverting input to the current sense ampli-
fier is typically tied to the connection between the A am-
plifier output and the current sense resistor connected in
series with the 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 impedence logic input that disables the A
and B power amplifiers, as well as the Current Sense
amplifier. The UV comparators and logic functions of the
UC3173A remain active. This input has an internal
pull-up that will inhibit the device if the input is left open.
The Inhibit function is overridden by any condition that
forces the Park function to be activated.
PARK: Input that forces the park condition on the
UC3173A. 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
lowside 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 ei-
ther of the UV inputs are low, or that the supply voltage
at the VL input to the UC3173A 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 poten-
tial, the current sense amplifier will be in its low range
mode. In this mode the voltage gain of the amplifier 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 noninverting 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.
PIN DESCRIPTIONS


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