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UC3172A датащи(PDF) 8 Page - Texas Instruments |
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UC3172A датащи(HTML) 8 Page - Texas Instruments |
8 / 12 page UC3172A Figure 1. Typical Application APPLICATION INFORMATION (cont.) Design Procedure for Application of the UC3172A The following is a simple design flow that can be used to configure the UC3172A or UC3173A Full Bridge Power Amplifiers as shown in Figure 1. Definitions: f3dB = the closed loop 3dB bandwidth AVB = B amplifier closed loop gain, = Rfd/Rfc 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 range mode GmLR = closed loop transconductance in low range mode L = load inductance RL = load resistance A. Choose RS to be as large as head room will tolerate, this is the series current sense resistor. B. Choose a value of RFB to be less than the peak cur- rent sense amplifier swing divided by 1mA. A value in the range of 3k to 10k is suggested. C. Calculate RFA according to: (1) RFA = RFB 0.5 • RS • GmHR 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: (2) RFA = RFB 2 • RS • GmLR D. 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 amplifier is slaved to the A amplifier. The bias point of the REFIN and the gain of the B amplifier, as well as the saturation voltages of the power output stages, will affect the voltage available to the load. There are two simple procedures to follow, either will insure that the capabilities of the device are fully util- ized. The first is to set the REFIN voltage at the cen- ter of the available voltage swing at the output of the power amplifiers. This optimum reference is defined by equation (3). (3) VREF (optimum) = VIN − VHSsat + VLSsat 2 where: VHSsat = high-side Vsat at maximum load VLSsat = low-side Vsat at maximum load. A second approach is to raise the gain of the B am- plifier to insure maximum swing. For a given REFIN voltage the gain of the B amplifier, set by the ratio of the feedback resistors, can be made greater than unity as given by: (4) AVB = VIN − VHSsat + VREF VREF − VLSsat or, VREF − VLSsat VIN − VHSsat − VREF UDG-94040 GM = IL VS = Rfb Rfa • I AVCS • RS AVCS= Current Sense Amplifier Gain = 2.0 Low Range, 0.5 High Range 8 |
Аналогичный номер детали - UC3172A |
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Аналогичное описание - UC3172A |
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