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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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CS5308GDWR28 датащи(PDF) 23 Page - ON Semiconductor |
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CS5308GDWR28 датащи(HTML) 23 Page - ON Semiconductor |
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23 / 31 page  CS5308 http://onsemi.com 23 the RCSn • CCSn network to provide a “square−wave” at the VDRP output pin with maximum rise time and minimal overshoot as shown in Figure 21. Figure 19. VDRP Tuning Waveforms. The RC Time Constant of the Current Sense Network Is Too Long (Slow): VDRP and VOUT Respond Too Slowly. Figure 20. VDRP Tuning Waveforms. The RC Time Constant of the Current Sense Network Is Too Short (Fast): VDRP and VOUT Both Overshoot. Figure 21. VDRP Tuning Waveforms. The RC Time Constant of the Current Sense Network Is Optimal: VDRP and VOUT Respond to the Load Current Quickly Without Overshooting. 8. Error Amplifier Tuning After the steady−state (static) AVP has been set and the current sense network has been optimized the Error Amplifier must be tuned. Basically, the gain of the Error Amplifier should be adjusted to provide an acceptable transient response by increasing or decreasing the Error Amplifier’s feedback capacitor (CAMP in the Applications Diagram). The bandwidth of the control loop will vary directly with the gain of the error amplifier. Figure 22. The Value of CAMP Is Too High and the Loop Gain/Bandwidth Too Low. COMP Slews Too Slowly Which Results in Overshoot in VOUT. If CAMP is too large the loop gain/bandwidth will be low, the COMP pin will slew too slowly, and the output voltage will overshoot as shown in Figure 22. On the other hand, if |
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