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參數(shù)資料
| 型號： | MC33023DWR2 |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | High Speed Single−Ended PWM Controller |
| 中文描述： | 2 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | SOIC-16 |
| 文件頁數(shù)： | 12/18頁 |
| 文件大?。?/td> | 450K |
| 代理商： | MC33023DWR2 |
MC34023, MC33023
http://onsemi.com
12
Figure 24. Resistive Current Sensing
I
Sense
9
The addition of an RC filter will eliminate instability caused by the
leading edge spike on the current waveform. This sense signal can also
be used at the ramp input pin for current mode control. For ramp
compensation it is necessary to know the gain of the current feedback
loop. If a transformer is used, the gain can be calculated by:
9
Figure 25. Primary Side Current Sensing
R
w
I
Sense
The addition of an RC filter will eliminate instability caused by the
leading edge spike on the current waveform. This sense signal can also
be used at the ramp input pin for current mode control. For ramp
compensation it is necessary to know the gain of the current feedback
loop. The gain can be calculated by:
Ai
RSense
turns ratio
Ai
R
w
turns ratio
3
7
6
5
Figure 26A. Slope Compensation (Noise Sensitive)
Oscillator
C
T
C
1
R
1
R
2
Current Sense
Information
4
1.25 V
This method of slope compensation is easy to implement, however, it
is noise sensitive. Capacitor C
1
provides AC coupling. The oscillator
signal is added to the current signal by a voltage divider consisting of
resistors R
1
and R
2
.
3
7
Figure 26B. Slope Compensation (Noise Immune)
Current Sense
Resistor
R
f
C
f
C
M
1.25 V
R
M
Ramp
Input
Output
R
w
Output
R
M
C
M
R
f
C
f
1.25 V
Ramp
Input
Current Sense
Transformer
7
3
When only one output is used, this method of slope compensation can be used and it is relatively noise immune. Resistor R
M
and capacitor C
M
provide the added
slope necessary. By choosing R
M
and C
M
with a larger time constant than the switching frequency, you can assume that its charge is linear. First choose C
M
, then
R
M
can be adjusted to achieve the required slope. The diode provides a reset pulse at the ramp input at the end of every cycle. The charge current I
M
can be calculated
by I
M
= C
M
S
e
. Then R
M
can be calculated by R
M
= V
CC
/I
M.
Figure 26.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MC33023DWR2G | High Speed Single−Ended PWM Controller |
| MC33025DWG | High Speed Double−Ended PWM Controller |
| MC33025DWR2 | High Speed Double−Ended PWM Controller |
| MC33025DWR2G | High Speed Double−Ended PWM Controller |
| MC33025PG | High Speed Double−Ended PWM Controller |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MC33023DWR2G | 功能描述:電流型 PWM 控制器 Single Ended Voltage or Current Mode PWM 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 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| MC33023P | 制造商:Motorola 功能描述:MOTOROLA S1I2F |
| MC33024 | 制造商:SPC Multicomp 功能描述:FINGER GUARD 制造商:SPC Multicomp 功能描述:FINGER GUARD; For Use With:127mm Axial Fans; Fan Size:127mm; Fixing Centers:113.3mm; Guard Material:Steel; Accessory Type:Finger Guard; Color:Chrome; External Depth:5.5mm; External Height:115.6mm; External Width:115.6mm ;RoHS Compliant: Yes |
| MC33025 | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:High Speed Double-Ended PWM Controller |
| MC33025DW | 功能描述:電流型 PWM 控制器 Dual Output Voltage 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 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
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