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UC1637-SP Scheda tecnica(PDF) 5 Page - Texas Instruments

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Il numero della parte UC1637-SP
Spiegazioni elettronici  RAD-TOLERANT CLASS-V, SWITCHED MODE CONTROLLER FOR DC MOTOR DRIVE
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UC1637-SP
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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
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