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参数资料
| 型号： | MC44608P40G |
| 厂商： | ON Semiconductor |
| 文件页数： | 14/15页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR FLYBK ISO PWM 8-DIP |
| 产品变化通告： | Product Obsolescence 01/Jul/2009 |
| 标准包装： | 50 |
| PWM 型： | 电压模式 |
| 输出数： | 1 |
| 频率 - 最大： | 44kHz |
| 占空比： | 86% |
| 电源电压： | 6.6 V ~ 13 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： | 8-DIP（0.300"，7.62mm） |
| 包装： | 管件 |
| 其它名称： | MC44608P40GOS |
MC44608
The secondary reconfiguration is activated by the m P
through the switch. The dV/dt appearing on the high voltage
winding (pins 14 of the transformer) at every TMOS switch
off, produces a current spike through the series RC network
R7, C17. According to the switch position this spike is either
absorbed by the ground (switch closed) or flows into the
thyristor gate (switch open) thus firing the MCR22--6. The
closed position of the switch corresponds to the Pulsed
Mode activation. In this secondary side SMPS status the
high voltage winding (12--14) is connected through D12 and
applied to the secondary windings 12--14, 10--11 and 6--7
(Vaux) are thus divided by ratio N12--14 / N9--8 (number of
turns of the winding 12--14 over number of turns of the
winding 9--8). In this reconfigured status all the secondary
voltages are lowered except the 8.0 V one. The regulation
during every pulsed or burst is performed by the zener diode
DZ3 which value has to be chosen higher than the normal
mode regulation level. This working mode creates a voltage
ripple on the 8.0 V rail which generally must be post
regulated for the microProcessor supply.
DZ1 to the 8.0 V low voltage secondary rail. The voltages
Figure 19. SMPS Pulsed Mode
The Figure 19 shows the SMPS behavior while working
in the reconfigured mode. The top curve represents the V CC
voltage (pin 6 of the MC44608). The middle curve
represents the 8.0 V rail. The regulation is taking place at
11.68 V. On the bottom curve the pin 2 voltage is shown.
voltage is the result of the 200 m A current source activated
during the startup phase and also during the working phase
which flows through the R4 resistor. The used high
resolution mode of the oscilloscope does not allow to show
the effective ton current flowing in the sensing resistor R11.
This voltage represents the current sense signal. The pin 2
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MC44608P75 | 功能描述:电压模式 PWM 控制器 75KHz 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 |
| MC44608P75G | 功能描述:电压模式 PWM 控制器 75KHz 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 |
| MC4466 | 制造商:SHENZHENFREESCALE 制造商全称:ShenZhen FreesCale Electronics. Co., Ltd 功能描述:N-Channel 30-V (D-S) MOSFET High performance trench technology |
| MC4468 | 制造商:SHENZHENFREESCALE 制造商全称:ShenZhen FreesCale Electronics. Co., Ltd 功能描述:N-Channel 30-V (D-S) MOSFET High performance trench technology |
| MC44722A | 制造商:MOTOROLA 制造商全称:Motorola, Inc 功能描述:Advanced Digital Video Encoder |
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