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參數資料
| 型號： | MC33025P |
| 廠商： | MOTOROLA INC |
| 元件分類： | 穩壓器 |
| 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： | PLASTIC, DIP-16 |
| 文件頁數： | 11/20頁 |
| 文件大小： | 516K |
| 代理商： | MC33025P |
MC34025 MC33025
11
MOTOROLA ANALOG IC DEVICE DATA
CT
Vref
RDT
RT
4
Oscillator
Figure 23. 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 24. 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 25. 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 26. Primary Side Current Sensing
Rw
ISense
9
Figure 27. Primary or Secondary Side
Current Sensing
0
ISense
Rw
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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