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MC33025 Scheda tecnica(PDF) 11 Page - ON Semiconductor |
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MC33025 Scheda tecnica(HTML) 11 Page - ON Semiconductor |
11 / 20 page MC34025, MC33025 http://onsemi.com 11 CT Vref RDT RT 4 Oscillator Figure 24. Dead Time Addition 5 6 Additional dead time can be added by the addition of a dead time resistor from Vref to CT. See text on oscillator section for more information. 5.0 V 0 V CT RT Oscillator Figure 25. External Clock Synchronization 4 5 6 The sync pulse fed into the clock pin must be at least 3.9 V. RT and CT need to be set 10% slower than the sync frequency. This circuit is also used in voltage mode operation for master/slave operation. The clock signal would be coming from the master which is set at the desired operating frequency, while the slave is set 10% slower. Figure 26. Resistive Current Sensing ISense 9 The addition of an RC filter will eliminate instability caused by the leading edge spike on the current waveform. This sense signal can also be used at the ramp input pin for current mode control. For ramp compensation it is necessary to know the gain of the current feedback loop. If a transformer is used, the gain can be calculated by: Ai + RSense turns ratio Figure 27. Primary Side Current Sensing Rw ISense 9 Figure 28. Primary or Secondary Side Current Sensing 0 ISense Rw 9 Ai + Rw turns ratio The addition of an RC filter will eliminate instability caused by the leading edge spike on the current waveform. This sense signal can also be used at the ramp input pin for current mode control. For ramp compensation it is necessary to know the gain of the current feedback loop. The gain can be calculated by: |
Codice articolo simile - MC33025_12 |
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Descrizione simile - MC33025_12 |
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