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參數(shù)資料
| 型號： | ML4810 |
| 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)： | 6/11頁 |
| 文件大小： | 196K |
| 代理商： | ML4810 |
ML4810, ML4811
6
REV. 1.0 10/10/2000
Figure 4. Switching Current and Pin 4 Voltage — Normal
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
Figure 7. Oscillator Timing Resistance vs Frequency
Figure 8. Oscillator Deadtime vs Frequency
OSCILLATOR
The ML4811 oscillator charges the external capacitor (C
T
)
with a current (I
SET
) equal to 3/R
T
. 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. A
discharge of the oscillator con be initiated by applying a
high level to the Sync pin. A short pulse of a frequency
higher than the oscillator’s free running frequency can be
used to synchronize the ML4811 to an external clock. The
pulse can be equal to the desired deadtime (T
D
) or the
deadtime can be determined by I
DIS
and C
T
, whichever is
greater.
I(1)
V(1)
I(1)
V(1)
Figure 5. Switching Current and Pin 4 Voltage — Load Fault
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
T
PD
T
PD
T
PD
V
TH2
V
TH1
SWITCH CURRENT
DIODE CURRENT
Figure 6. Simplified Oscilator Block Diagram and Timing
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ML4811 | High Frequency PWM Controller(高頻PWM控制器) |
| ML4812IQ | Power Factor Controller |
| ML4812 | Power Factor Controller |
| ML4812CP | Power Factor Controller |
| ML4812CQ | Power Factor Controller |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ML4810CP | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:High Frequency Power Supply Controller |
| ML4810CS | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:High Frequency Power Supply Controller |
| ML4811CP | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:High Frequency Power Supply Controller |
| ML4811CS | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:High Frequency Power Supply Controller |
| ML4812 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:功率因數(shù)控制器 |
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