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UC1637-SP Scheda tecnica(PDF) 5 Page - Texas Instruments |
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UC1637-SP Scheda tecnica(HTML) 5 Page - Texas Instruments |
5 / 11 page 13 12 9 UC1637-SP www.ti.com SLUS950 – FEBRUARY 2010 PWM Comparators Two comparators are provided to perform pulse width modulation for each of the output drivers. Inputs are uncommitted to allow maximum flexibility. The pulse width of the outputs A and B is a function of the sign and amplitude of the error signal. A negative signal at -AIN and +BIN will lengthen the high state of output A and shorten the high state of output B. Likewise, a positive error signal reverses the procedure. Typically, the oscillator waveform is compared against the summation of the error signal and the level set on -BIN and +AIN. Figure 2. Comparator Biasing MODULATION SCHEMES Case A Zero Deadtime (Equal voltage on -BIN and +AIN) In this configuration, maximum holding torque or stiffness and position accuracy is achieved. However, the power input into the motor is increased. Figure 3 (A) shows this configuration. Case B Small Deadtime (Voltage on -BIN > +AIN) A small differential voltage between -BIN and +AIN provides the necessary time delay to reduce the chances of momentary short circuit in the output stage during transitions, especially where power-amplifiers are used. Refer to Figure 3 (B). Case C Increased Deadtime and Deadband Mode (Voltage on -BIN > +AIN) With the reduction of stiffness and position accuracy, the power input into the motor around the null point of the servo loop can be reduced or eliminated by widening the window of the comparator circuit to a degree of acceptance. Where position accuracy and mechanical siffness is unimportant, deadband operation can be used. This is shown in Figure 3 (C). Copyright © 2010, Texas Instruments Incorporated Submit Documentation Feedback 5 Product Folder Link(s): UC1637-SP |
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