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參數(shù)資料
| 型號： | ML4811 |
| 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)： | 7/11頁 |
| 文件大小： | 196K |
| 代理商： | ML4811 |
ML4810, ML4811
REV. 1.0 10/10/2000
7
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 9. Oscillator Deadtime vs C
T
(3k
≤
R
T
≤
100k
)
ERROR AMPLIFIER
The ML4811 error amplifier is a 5.5MHz bandwidth
12V/
μ
sec slew rate op-amp with provision for limiting the
positive output voltage swing (Output Inhibit line) for ease
in implementing the soft start function.
Figure 11. Open Loop Frequency Response
A
FREQUENCY (Hz)
100
10k
10M
1k
100k
100M
1M
100
80
60
40
20
0
–20
0
0
–90
–180
AV
0
POWER V
C
OUT A
OUT B
POWER
GND
V
CC
13
11
14
12
Q2
Q1
Figure 12. Simplified Schematic
5
4
3
2
1
(
TIME (
μ
s)
0
0.2
0.6
1.0
0.8
0.4
V
OUT
V
IN
Figure 10. Unity Gain Slew Rate
OUTPUT DRIVER STAGE
The ML4811 Output Driver is a 2A peak output high
speed totem pole circuit designed to quickly switch the
gates of capacitive loads, such as power MOSFET
transistors.
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