参数资料
| 型号： | MC44605PG |
| 厂商： | ON Semiconductor |
| 文件页数： | 13/20页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR FLYBK ISO PWM 16DIP |
| 产品变化通告： | Product Obsolescence 19/Dec/2008 |
| 标准包装： | 500 |
| 系列： | GreenLine™ |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 250kHz |
| 占空比： | 80% |
| 电源电压： | 10 V ~ 15 V |
| 降压： | 无 |
| 升压： | 无 |
| 回扫： | 是 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 是 |
| 工作温度： | -25°C ~ 85°C |
| 封装/外壳： | 16-DIP（0.300"，7.62mm） |
| 包装： | 管件 |
| 其它名称： | MC44605PGOS |
MC44605
Synchro.
Signal
V CC
Negative Active
Clamping System
E.H.T. OVP
Block
A diode D is incorporated to clamp the positive applied
voltages while an active clamping system limit the negative
voltages to typically ? 0.33 V. This negative clamp level is
high enough to avoid the substrate diode switching on.
A latch system is incorporated to keep the
Pin 9
R
? 200 mV
sync
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 8). This
process avoids that any ringing on the signal used on the
pin 8, disrupts the demagnetization detection (refer to
MC44605
Figure 6. Synchronization
Demagnetization Section
This block is incorporated to detect the complete core
demagnetization in order to prevent the power MOSFET
from switching on if the converter is not in a dead time
phase. That is why this block inhibits any oscillator re ? start
as long as the inductor current is not finished (from the
beginning of the on ? time to the end of the demagnetization
phase).
In a fly ? back, a good means to detect the demagnetization
phase consists in using the V CC winding voltage. In effect,
this voltage is:
— negative during the on ? time,
— positive during the off ? time,
Figure 7). Finally, this method results in a very accurate
demagnetization phase detection, and the signal V DT drawn
from this block is high only for the dead time. Therefore, an
oscillator re ? start and so, a new power switch conduction is
only allowed during the dead ? time.
For a higher safety, the V demagout output of the
demagnetization block is also directly connected to the
output, to disable it during the demagnetization phase (refer
to the block diagram).
The demagnetization detection can be inhibited by
connecting pin 8 to the ground but in this case, a timer (about
3 m s) that is incorporated to set the latch when it can not be
set by V demagout , results in a minimum off ? time (refer to
Figure 8).
Output
Buffer
— equal to zero for the dead ? time with generally a
ringing (refer to Figure 7).
Zero
3 m s
R Q
Demag
S Q
V CC
V pin 8
Current
Detection
0.75 V
V demag out
Negative Active
Clamping System
Pin 8
65 mV
65 mV
Oscillator
V DT
C DEM
D
? 0.33 V
Figure 8. Demagnetization Block
On ? Time
Off ? Time Dead ? Time
Figure 7. Demagnetization Detection
That is why, the MC44605 demagnetization detection
consists of a comparator that compares the V CC winding
voltage to a reference that is typically equal to 65 mV.
Overvoltage Protection Section
The overvoltage arrangement compares a portion V cc to
V ref (2.5 V) (refer to Figure 9). In fact, this threshold
corresponds to a V CC equal to to 17 V. When the V cc is
higher than this level, the output is latched off until a new
circuit re ? start.
http://onsemi.com
13
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| MC44608P40 | 功能描述:电压模式 PWM 控制器 40KHz High Voltage RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| MC44608P40G | 功能描述:电压模式 PWM 控制器 40KHz High Voltage SMPS PWM RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
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