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參數(shù)資料
| 型號： | TC33025VOETR |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 2 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | SOIC-16 |
| 文件頁數(shù)： | 18/18頁 |
| 文件大?。?/td> | 416K |
| 代理商： | TC33025VOETR |
9
TC33025
High Speed Double Ended Controller
TC33025-1 5/25/00
Figure 10. Primary or Secondary Side Current Sensing
ISENSE
0
9
RW
Figure 11. Slope Compensation (Noise Sensitive)
3
7
6
5
4
Oscillator
CT
C1
R2
R1
Current Sense
Information
1.25V
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.
Figure 12. Slope Compensation (Noise Immune)
7
3
7
1.25V
3
Output
RM
RW
RF
CM
RM
CF
Ramp Input
Output
CM
CF
Current Sense
Transformer
Current Sense
Resistor
1.25V
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 assumethat 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 13. Current Mode Master/Slave Operation Over Short Distances
Oscillator
5
6
CT
RT
VREF
4
Oscillator
5
6
4
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