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參數(shù)資料
| 型號： | MC44605 |
| 廠商： | ON SEMICONDUCTOR |
| 英文描述： | High Safety, Latched Mode, GreenLine PWM Controller for (Multi)Synchronized Applications |
| 中文描述： | 高安全性，鎖存模式，二七二三六七六七的PWM控制器（同步多應(yīng)用） |
| 文件頁數(shù)： | 7/20頁 |
| 文件大?。?/td> | 328K |
| 代理商： | MC44605 |
MC44605
http://onsemi.com
7
Pin
Name
Pin Description
1
VCC
VC
This pin is the positive supply of the IC.
2
The output high state, VOH, 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.
3
Output
The output current capability is suited for driving a power MOSFET.
4
GND
The ground pin is a single return typically connected back to the power
source. It is used as control and power ground.
5
Maximum Power Limitation
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.
6
Over–Heating Detection
This block estimates the MOSFET heating. When this calculated heating is
too high, the device gets definitively disabled (disabling block action).
7
Current Sense Input
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.
8
Demagnetization Detection
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
μ
s.
9
Synchronization and E.H.T.OVP Input
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 Cext capacitor is charged so that the circuit gets definitively
disabled if the Cext voltage becomes higher than Vref. This block is
incorporated to detect and disable the device when the synchronization
pulses are too high.
10
Oscillator Capacitor CT
The free mode oscillator frequency is programmed by the capacitor CT
choice together with the Rref resistance value. CT, connected between
pin 10 and GND, generates the oscillator sawtooth.
11
Soft–Start
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 shut down.
12
Cext (Disabling Block)
When a too high synchronization pulse voltage (E.H.T.OVP) or a winding
short circuit (WSCD) is detected, the capacitor Cext is charged using
a current source IDis– H. In the case of a MPL or OHD fault detection, Cext
is charged using IDis–L. If the Cext capacitor voltage gets higher than Vref,
the circuit is definitively disabled. Then, to restart, the converter must be
switched off in order to make VCC decrease down to about 0 V.
13
E/A Output
The error amplifier output is made available for loop compensation.
14
Voltage Feedback
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 VCC voltage in case of primary sensing technic.
15
Winding Short Circuit Detection
Programmation
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.
16
Rref
The Rref value fixes the internal reference current that is particularly used to
perform the precise oscillator waveform. The current range goes from 100
μ
A up to 500
μ
A.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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 |
| MC44605P | 功能描述:電流型 PWM 控制器 Greenline 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 |
| MC44605PG | 功能描述:電流型 PWM 控制器 ANA SMPS PWM FREQ CONT 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 |
| MC44608 | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:Few External Components Reliable Flexible GreenLine Very High Voltage PWM Controller |
| MC44608_06 | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:Few External Components Reliable and Flexible SMPS Controller |
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