參數(shù)資料
型號(hào)： MC33025PG
廠商： ON SEMICONDUCTOR
元件分類(lèi)： 穩(wěn)壓器
英文描述： High Speed Double−Ended PWM Controller
中文描述： 2 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDIP16
封裝： LEAD FREE, PLASTIC, DIP-16
文件頁(yè)數(shù)： 11/20頁(yè)
文件大?。?/td> 482K
代理商： MC33025PG
MC34025, MC33025
http://onsemi.com
11
C
T
V
ref
R
DT
R
T
4
Oscillator
Figure 24. Dead Time Addition
5
6
Additional dead time can be added by the addition of a dead
time resistor from V
ref
to C
T
. See text on oscillator section for
more information.
5.0 V
0 V
C
T
R
T
Oscillator
Figure 25. External Clock Synchronization
4
5
6
The sync pulse fed into the clock pin must be at least 3.9 V. R
T
and C
T
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
I
Sense
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
R
w
I
Sense
9
Figure 28. Primary or Secondary Side
Current Sensing
0
I
Sense
R
w
9
Ai
R
w
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:
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