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參數(shù)資料
| 型號： | MC34023P |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 5-V Battery-Backup Supervisors for RAM Retention 8-MSOP -40 to 125 |
| 中文描述： | 2 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDIP16 |
| 封裝： | PLASTIC, DIP-16 |
| 文件頁數(shù)： | 11/19頁 |
| 文件大小： | 470K |
| 代理商： | MC34023P |
MC34023 MC33023
11
MOTOROLA ANALOG IC DEVICE DATA
Figure 23. Resistive Current Sensing
ISense
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:
Ai
RSense
turns ratio
9
Figure 24. Primary Side Current Sensing
Rw
ISense
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
R
w
turns ratio
3
7
6
5
Figure 25A. Slope Compensation (Noise Sensitive)
Oscillator
CT
C1
R1
R2
Current Sense
Information
4
1.25 V
This method of slope compensation is easy to implement, however, it
is noise sensitive. Capacitor C1 provides AC coupling. The oscillator
signal is added to the current signal by a voltage divider consisting of
resistors R1 and R2.
3
7
Figure 25B. Slope Compensation (Noise Immune)
Current Sense
Resistor
Rf
Cf
CM
1.25 V
RM
Ramp
Input
Output
Rw
Output
RM
CM
Rf
Cf
1.25 V
Ramp
Input
Current Sense
Transformer
7
3
Figure 25.
When only one output is used, this method of slope compensation can be used and it is relatively noise immune. Resistor RM and capacitor CM provide the added
slope necessary. By choosing RM and CM with a larger time constant than the switching frequency, you can assume that its charge is linear. First choose CM, then
RM 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 IM can be calculated
by IM = CMSe. Then RM can be calculated by RM = VCC/IM.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MC34023PG | 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(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| MC34025 | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:High Speed Double-Ended PWM Controller |
| MC34025_05 | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:High Speed Double−Ended PWM Controller |
| MC34025_12 | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:High Speed Double-Ended PWM Controller |
| MC34025DW | 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(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
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