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UC1638 Scheda tecnica(PDF) 6 Page - Texas Instruments |
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UC1638 Scheda tecnica(HTML) 6 Page - Texas Instruments |
6 / 9 page 6 UC1638 UC2638 UC3638 The UC3638 is designed to provide pulse width modula- tion control of DC brush motors in applications requiring precision torque, velocity, or position control. Due to its high frequency capability, other high power applications such as switch mode audio amplifiers can also be ad- dressed. Through a combination of circuit sophistication and integration, the designer can maintain a high level of flexibility, while reducing cost compared to solutions using other PWM ICs. Figure 1 shows a typical application circuit for the UC3638. By taking advantage of the UC3638's many in- tegrated functions, a low cost and compact average cur- rent mode motor controller can be designed. Depending on the level of complexity, as many as 15 discrete com- ponents and an additional high bandwidth amplifier can be saved compared to a similar circuit using the UC3637 PWM controller. Oscillator Section and Modulation Scheme Figure 2 depicts the UC3638 oscillator and PWM wave- forms for the condition where the output of the voltage amplifier (COMP) is at the null point (same voltage as AREF). For applications using split voltage supply rails, AREF will normally be tied to system ground. This re- sults in a voltage null point of zero volts. For this condi- tion, AREFIN should be tied to the negative voltage sup- ply rail (VEE), which disables the internal voltage buffer, allowing AREF to be tied to ground. For a single supply system, AREFIN should be left open circuit, and AREF should be decoupled to VEE (system ground) with at least 0.1 µF. The resulting voltage null point for this case APPLICATION INFORMATION Figure 1. Average Motor Current Control Loop UDG-95049-2 Figure 2. Oscillator and PWM Waveforms UDG-95068-1 |
Codice articolo simile - UC1638 |
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Descrizione simile - UC1638 |
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