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UC3172AQP датащи(PDF) 5 Page - Texas Instruments |
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UC3172AQP датащи(HTML) 5 Page - Texas Instruments |
5 / 12 page 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 |
Аналогичный номер детали - UC3172AQP |
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Аналогичное описание - UC3172AQP |
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