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參數(shù)資料
| 型號： | ML4823IQ |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | High Frequency Power Supply Controller |
| 中文描述： | 2 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PQCC20 |
| 封裝： | PLASTIC, LCC-20 |
| 文件頁數(shù)： | 5/9頁 |
| 文件大小： | 121K |
| 代理商： | ML4823IQ |
ML4823
REV. 1.0 10/12/2000
5
FUNCTIONAL DESCRIPTION
OSCILLATOR
The ML4823 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
RAMP
= C (Ramp Valley to Peak)/I
SET
and:
T
DEADTIME
= C (Ramp Valley to Peak)/I
Q1
+
–
5.1V
Q1
R
T
R
T
I
SET
C
T
I
SET
400
μ
A
I
Q1
3V
Q
2
CLOCK
OUT
CLOCK OUT
T
D
C
T
RAMP PEAK
RAMP VALLEY
Figure 2. Oscillator Timing Resistance vs Frequency
Figure 4. Oscillator Deadtime vs C
T
(3ky - R
T
- 100ky)
30
25
20
15
10
5
0
0.47
1.0
2.2
4.7
10.0
22
C
T
(nF)
T
D
μ
s
47
100
160
140
120
100
80
10k
100k
1M
FREQ (Hz)
D
1.0nF
470pF
Figure 3. Oscillator Deadtime vs Frequency
Figure 1. Oscillator Block Diagram
100k
10k
1k
0.1k
1k
10k
100k
1M
10M
FREQ (Hz)
100nF
47nF
22nF
10nF
4.7nF
2.2nF
1nF
470pF
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ML4823CP | High Frequency Power Supply Controller |
| ML4823CQ | High Frequency Power Supply Controller |
| ML4823CS | High Frequency Power Supply Controller |
| ML4823IS | High Frequency Power Supply Controller |
| ML4823MJ | High Frequency Power Supply Controller |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ML4823IS | 功能描述:電流型 PWM 控制器 Pwr Spply Controller High Frequency RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| ML4823ISX | 功能描述:電流型 PWM 控制器 Pwr Spply Controller High Frequency RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| ML4823MJ | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:High Frequency Power Supply Controller |
| ML4824 | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Power Factor Correction and PWM Controller Combo |
| ML4824_03 | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Power Factor Correction and PWM Controller Combo |
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