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參數(shù)資料
| 型號： | MC33025PG |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 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 |
| 文件頁數(shù)： | 12/20頁 |
| 文件大?。?/td> | 482K |
| 代理商： | MC33025PG |
MC34025, MC33025
http://onsemi.com
12
3
7
6
5
4
Figure 29A. Slope Compensation (Noise Sensitive)
Oscillator
C
T
C
1
R
1
R
2
Current Sense
Information
1.25 V
This method of slope compensation is easy to implement, however, it is noise sensitive. Capacitor C
1
provides AC coupling. The oscillator
signal is added to the current signal by a voltage divider consisting of resistors R
1
and R
2
.
7
3
7
3
Figure 29B. Slope Compensation (Noise Immune)
R
w
Output
R
M
C
M
R
f
C
f
1.25 V
Ramp
Input
Current Sense
Transformer
Current Sense
Resistor
R
f
C
f
C
M
1.25 V
R
M
Ramp
Input
Output
Figure 29. 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 R
M
and
capacitor C
M
provide the added slope necessary. By choosing R
M
and C
M
with a larger time constant than the switching frequency, you
can assume that its charge is linear. First choose C
M
, then R
M
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 I
M
can be calculated by I
M
= C
M
S
e
. Then R
M
can be calculated by
R
M
= V
CC
/I
M
.
Figure 30. Current Mode Master/Slave Operation Over Short Distances
V
ref
6
5
4
Oscillator
C
T
R
T
6
5
4
Oscillator
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