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UC3173A Datasheet(PDF) 8 Page - Texas Instruments |
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UC3173A Datasheet(HTML) 8 Page - Texas Instruments |
8 / 12 page UC3173A 8 Figure 1. Typical application. APPLICATION INFORMATION (cont.) Design Procedure for Application of the UC3173A The following is a simple design flow that can be used to configure the UC3173A Full Bridge Power Amplifiers as shown in Fig. 1. A. Current Sense Resistor Choose RS to be as large as head room will tolerate, this is the series current sense resistor. B. Select Feedback Resistance Choose a value of RFB to be less than the peak current sense amplifier swing divided by 1mA. A value in the range of 3k to 10k is suggested. C. Set Transconductance Calculate RFA according to: R= R 0.5 R G FA FB SmHR •• (1) If the range change option is not going to be used, it is recommended that the device be set in the low range mode and RFA be calculated by: R= R 2R G FA FB SmLR •• (2) D. Optimize Voltage Swing In order to assure that maximum voltage drive to the load is achievable, there are some precautions that should be taken. In a standard configuration, the B am- plifier is slaved to the A amplifier. The bias point of the and the gain of the B amplifier, as well as the saturation voltages of the power output stages, will affect the volt- age available to the load. There are two simple procedures to follow, either will insure that the capabilities of the device are fully utilized. The first is to set the REFIN voltage at the center of the available voltage swing at the output of the power amplifiers. This optimum reference is defined by equation (3) GM = IL V = R R I AV R S FB FA CS S • • AVCS =Current Sense Amplifier Gain = 2.0 Low Range, 0.5 High Range f3DB = the closed loop 3dB bandwidth AVB = B amplifier closed loop gain, = R6/R5 AVCS = current sense amplifier gain, = 0.5 in high range, and 2.0 in low range fGBWA = gain bandwidth product of the A amplifier GmHR = closed loop transconductance in high rangemode GmLR = closed loop transconductance in low range mode L = load inductance RL = load resistance Definitions: UDG-94040 |
Similar Part No. - UC3173A_08 |
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Similar Description - UC3173A_08 |
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