参数资料
| 型号： | MC44605PG |
| 厂商： | ON Semiconductor |
| 文件页数： | 7/20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
Pin
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Name
V CC
V C
Output
GND
Maximum Power Limitation
Over ? Heating Detection
Current Sense Input
Demagnetization Detection
Synchronization and
E.H.T.OVP Input
Oscillator Capacitor C T
Soft ? Start
C ext (Disabling Block)
E/A Output
Voltage Feedback
Winding Short Circuit
Detection Programmation
R ref
Pin Description
This pin is the positive supply of the IC.
The output high state, V OH , is set by the voltage applied to this pin. With a separate
connection to the power source, it gives the possibility to set by means of an external
resistor the output source current at a different value than the sink current.
The output current capability is suited for driving a power MOSFET.
The ground pin is a single return typically connected back to the power source. It is used as
control and power ground.
This block enables to estimate the input power. When this calculated power is detected as
too high, a fault information is sent to the disabling block in order to definitively disable the
circuit.
This block estimates the MOSFET heating. When this calculated heating is too high, the
device gets definitively disabled (disabling block action).
A voltage proportional to the current flowing into the power switch is connected to this input.
The PWM latch uses this information to terminate the conduction of the output buffer. A
maximum level of 1 V allows to limit the inductor current.
A voltage delivered by an auxiliary transformer winding provides to the demagnetization pin
an indication of the magnetization state of the flyback energy reservoir. A zero voltage
detection corresponds to a complete core demagnetization. The demagnetization detection
prevents the oscillator from a re ? start and so the circuit from a new conduction phase, if the
fly ? back is not in a dead ? time state. This function can be inhibited by connecting Pin 8 to
GND but in this case, there is a minimum off ? time typically equal to 3 m s.
Activating the synchronization input pin with a pulse higher or equal to the negative
threshold (typically ? 200 mV) allows the next switching period to be reinitialized. The
oscillator is free when connecting Pin 9 to GND.
When the E.H.T.OVP pin receives a voltage that is greater than 7.5 V, the disabling block
C ext capacitor is charged so that the circuit gets definitively disabled if the C ext voltage
becomes higher than V ref . This block is incorporated to detect and disable the device when
the synchronization pulses are too high.
The free mode oscillator frequency is programmed by the capacitor C T choice together with
the R ref resistance value. C T , connected between pin 10 and GND, generates the oscillator
sawtooth.
A capacitor connected to this pin can temporary reduce the maximum inductor peak
current. By this way, a soft ? start can be performed. By connecting pin 11 to Ground, the
MC44605 is shutdown.
When a too high synchronization pulse voltage (E.H.T.OVP) or a winding short circuit
(WSCD) is detected, the capacitor C ext is charged using a current source I Dis ? H . In the
case of a MPL or OHD fault detection, C ext is charged using I Dis ? L . If the C ext capacitor
voltage gets higher than V ref , the circuit is definitively disabled. Then, to re ? start, the
converter must be switched off in order to make V CC decrease down to about 0 V.
The error amplifier output is made available for loop compensation.
This is the inverting input of the Error Amplifier. It can be connected to the Switching Mode
Power Supply output through an optical (or else) feedback loop or to the subdivided V CC
voltage in case of primary sensing technic.
The W.S.C.D. block is incorporated to detect the transformer Winding Short Circuits. This
function is performed by detecting the inductor overcurrents thanks to a comparator which
threshold is programmable to be well adapted to any application.
The R ref value fixes the internal reference current that is particularly used to perform the
precise oscillator waveform. The current range goes from 100 m A up to 500 m A.
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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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