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參數(shù)資料
| 型號： | ML4825 |
| 廠商： | Fairchild Semiconductor Corporation |
| 英文描述： | High Frequency PWM Controller(高頻PWM控制器) |
| 中文描述： | 高頻PWM控制器（高頻脈寬調(diào)制控制器） |
| 文件頁數(shù)： | 5/9頁 |
| 文件大?。?/td> | 108K |
| 代理商： | ML4825 |
ML4825
REV. 1.0 10/12/2000
5
FUNCTIONAL DESCRIPTION
OSCILLATOR
The ML4825 oscillator charges the external capacitor (C
T
)
with a current (I
SET
) equal to 3/R
SET
. When the capacitor
voltage reaches the upper threshold (Ramp Peak), the
comparator changes state and the capacitor discharges to
the lower threshold (Ramp Valley) through Q1. While the
capacitor is discharging, Q2 provides a high pulse.
The oscillator period can be described by the following
relationship:
t
OSC
= t
RAMP
+ t
DEADTIME
where:
t
C Ramp Valley toPeak
I
SET
RAMP
=
(
)
and:
t
C Ramp Valley toPeak
I
Q
DEADTIME
=
(
)
1
Figure 1. Oscillator Block Diagram
I
SET
R
T
3V
C
T
I
SET
5.1V
Q1
I
Q1
CLOCK
t
D
RAMP PEAK
RAMP VALLEY
C
T
4
6
5
+
–
100k
10k
1k
R
T
)
FREQUENCY (Hz)
100
1k
10k
1M
100k
100nF
47nF
22nF
0nF
4.7nF
2.2nF
1nF
470pF
160
140
120
100
80
T
D
FREQUENCY (Hz)
10k
100k
1M
1.0nF
470pF
4.70
2.20
1.00
0.47
0.22
0.10
0.047
T
μ
s
CT (nF)
0.47
2.2
100
22
1.0
4.7
47
10.0
Figure 2. Oscillator Timing Resistance vs Frequency
Figure 3. Oscillator Deadtime vs Frequency
Figure 4. Oscillator Deadtime vs C
T
(3k
≤
R
T
≤
100k
)
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ML4825 WAF UP | 制造商:Fairchild Semiconductor Corporation 功能描述: |
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| ML4825CP UP WAF | 制造商:Fairchild Semiconductor Corporation 功能描述: |
| ML4825CQ | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| ML4825CQ UP WAF | 制造商:Fairchild Semiconductor Corporation 功能描述: |
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