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參數(shù)資料
| 型號： | MC34025P |
| 廠商： | MOTOROLA INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Battery-Backup Supervisors for RAM Retention 8-MSOP -40 to 85 |
| 中文描述： | 2 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDIP16 |
| 封裝： | PLASTIC, DIP-16 |
| 文件頁數(shù)： | 12/20頁 |
| 文件大?。?/td> | 516K |
| 代理商： | MC34025P |
MC34025 MC33025
12
MOTOROLA ANALOG IC DEVICE DATA
3
7
6
5
4
Figure 28A. Slope Compensation (Noise Sensitive)
Oscillator
CT
C1
R1
R2
Current Sense
Information
1.25 V
This method of slope compensation is easy to implement, however, it is noise sensitive. Capacitor C1 provides AC coupling. The oscillator signal is added to the
current signal by a voltage divider consisting of resistors R1 and R2.
7
3
7
3
Figure 28B. Slope Compensation (Noise Immune)
Rw
Output
RM
CM
Rf
Cf
1.25 V
Ramp
Input
Current Sense
Transformer
Current Sense
Resistor
Rf
Cf
CM
1.25 V
RM
Ramp
Input
Output
Figure 28. Keeps Fig numbering sequence correct
When only one output is used, this method of slope compensation can be used and it is relatively noise immune. Resistor RM and capacitor CM provide the added
slope necessary. By choosing RM and CM with a larger time constant than the switching frequency, you can assume that its charge is linear. First choose CM, then RM
can be adjusted to achieve the required slope. The diode provides a reset pulse at the ramp input at the end of every cycle. The charge current IM can be calculated
by IM = CMSe. Then RM can be calculated by RM = VCC/IM.
Figure 29. Current Mode Master/Slave Operation Over Short Distances
Vref
6
5
4
Oscillator
CT
RT
6
5
4
Oscillator
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