參數(shù)資料
型號(hào)： MC44604
廠商： ON SEMICONDUCTOR
英文描述： High Safety Pulsed Mode Stanby GreenLine PWM Controller
中文描述： 高安全性脈沖模式Stanby二七二三六七六七PWM控制器
文件頁(yè)數(shù)： 16/24頁(yè)
文件大?。?/td> 341K
代理商： MC44604
MC44604
http://onsemi.com
16
Figure 31. Demagnetization Detection
VPin 8
0.75 V
65 mV
–0.33 V
On–Time
Off–Time Dead–Time
Zero Current
Detection
A diode D has been incorporated to clamp the positive
applied voltages while an active clamping system limits the
negative voltages to typically –0.33 V. This negative clamp
level is sufficient to avoid the substrate diode switching on.
In addition to the comparator, a latch system has been
incorporated in order to keep the demagnetization block
output level low as soon as a voltage lower than 65 mV is
detected and as long as a new restart is produced (high level
on the output) (refer to Figure 33). This process avoids that
any ringing on the signal used on the pin 8, disrupts the
demagnetization detection. Finally, this method results in a
very accurate demagnetization detection.
For a higher safety, the demagnetization block output is
also directly connected to the output, disabling it during the
demagnetization phase (refer to Figure 29).
Figure 32. Demagnetization Block
C DEM
Oscillator
Output
Buffer
R
Demag
S
Q
VCC
Negative Active
Clamping System
Pin 8
D
65 mV
Vdemag out
Figure 33. Dmax and Soft–Start Block Diagram
MC44604
Vref
Dmax
Soft
Start
Capacitor
0.4 Iref
VOSC
Output
Control
DZ
2.4 V
Pin 11
Output
Buffer
Oscillator
Maximum Duty Cycle and Soft–Start Control
As explained in the paragraph “oscillator”, the duty cycle
cannot be more than 80%. Now, using the Dmax and
soft–start control, this duty cycle can be limited to a lower
value. Indeed as depicted in Figure 34, the pin 11 voltage is
compared to the oscillator sawtooth, so that the MC44604
output should be disabled as soon as the pin 11 level
becomes lower than the oscillator voltage (refer to Figure 27
and to Figure 25).
Figure 34. Maximum Duty Cycle Control
Voltage
Dmax
Pin 11
VCT
(Pin 10)
Now, using the internal current source (0,4 Iref), the pin 11
voltage can easily be fixed by connecting a resistor to this
pin.
If a capacitor is connected to pin 11 (without any resistor
or in parallel to a resistor for instance), the pin 11 voltage
increases from 0 to its maximum value progressively (refer
to Figure 26).
Thus, the allowed maximum duty cycle grows for a delay
depending on the capacitor value (and the resistor value
when a resistor is connected).
So, this pin can be used to limit the duty cycle during the
start–up phase and thus, to perform a soft–start.
相關(guān)PDF資料
PDF描述
MC44604P RV Series - Econoline Unregulated DC-DC Converters; Input Voltage (Vdc): 3.3V; Output Voltage (Vdc): 3.3V; Power: 2W; High Isolation 2W Converter; Approved for Medical Applications; EN and UL Safety Certificates; 6kVDC Isolation; Skinny DIP24 Package; Optional Continuous Short Circuit Protected; Fully Encapsulated; Very Low Isolation Capacitance
MC44605 High Safety, Latched Mode, GreenLine PWM Controller for (Multi)Synchronized Applications
MC44605P RW-S Series - Econoline Regulated DC-DC Converters; Input Voltage (Vdc): 05V; Output Voltage (Vdc): 05V; Power: 2W; DIP24 Low Profile Miniature Package; 1kVDC Isolation; Feedback Regulated Output; 2:1 Wide Range Voltage Input; Continuous Short Circuit Protection; Less than 7mm Height; SMD Pinning Option; Efficiency to 87%
MC44608P75 Few External Components Reliable Flexible GreenLine Very High Voltage PWM Controller
MC44608 Few External Components Reliable Flexible GreenLine Very High Voltage PWM Controller
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MC44604_05 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:High Safety Pulsed Mode Standby GreenLine TM PWM Controller
MC44604P 功能描述:電流型 PWM 控制器 Voltage Mode PWM RoHS:否 制造商:Texas Instruments 開(kāi)關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)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
MC44604PG 功能描述:電流型 PWM 控制器 Voltage Mode PWM w/Bust Mode Standby RoHS:否 制造商:Texas Instruments 開(kāi)關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)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
MC44605 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:High Safety, Latched Mode, GreenLine PWM Controller for (Multi)Synchronized Applications
MC44605_06 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:High Safety, Latched Mode, GreenLine TM PWM Controller for (Multi) Synchronized Applications
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫(xiě)一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*