參數(shù)資料
型號(hào): ML4823MJ
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, PDSO16
封裝: SOIC-16
文件頁(yè)數(shù): 5/9頁(yè)
文件大小: 121K
代理商: ML4823MJ
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
ML4824 Power Factor Correction and PWM Controller Combo(功率因數(shù)校正器和PWM控制器組合芯片)
ML4825 High Frequency PWM Controller(高頻PWM控制器)
ML4828 BiCMOS Phase Modulation/Soft Switching Controller(BiCMOS 相調(diào)制器/全橋軟開關(guān)控制器)
ML4830 Electronic Ballast Controller(電子整流器控制器)
ML4831 Electronic Ballast Controller(電子整流器控制器)
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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
ML4824CP1 功能描述:功率因數(shù)校正 IC PFC Controller PWM Combo RoHS:否 制造商:Fairchild Semiconductor 開關(guān)頻率:300 KHz 最大功率耗散: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Reel
ML4824CP-1 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:Power Factor Correction and PWM Controller Combo
ML4824CP1"32 制造商:Fairchild Semiconductor Corporation 功能描述:Power Factor Controller IC