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MC33025PG Arkusz danych(PDF) 11 Page - ON Semiconductor

Numer części MC33025PG
Szczegółowy opis  High Speed Double-Ended PWM Controller
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Producent  ONSEMI [ON Semiconductor]
Strona internetowa  http://www.onsemi.com
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MC33025PG Arkusz danych(HTML) 11 Page - ON Semiconductor

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MC34025, MC33025
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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:


Podobny numer części - MC33025PG

ProducentNumer częściArkusz danychSzczegółowy opis
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MC33025PG ONSEMI-MC33025PG Datasheet
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   High Speed Double?묮nded PWM Controller
October, 2005 ??Rev. 7
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