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參數(shù)資料
| 型號： | 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 |
| 文件頁數(shù)： | 10/24頁 |
| 文件大?。?/td> | 341K |
| 代理商： | MC44604 |
MC44604
http://onsemi.com
10
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. A
Bipolar transistor can also be driven for low power applications. The
maximum on–time of the duty cycle can last up to 80% of the switching
period.
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
Foldback Input
The foldback function ensures an overload protection. Feeding the
foldback input with a portion of the VCC voltage (1 V max) establishes on
the system control loop a foldback characteristic allowing a smoother
start–up and a sharper overload protection. The foldback action performs
an active current sense clamping reduction. Above 1 V the foldback input is
no more active.
6
Overvoltage Protection
When the overvoltage protection pin receives a voltage greater than 17 V
the device gets disabled and requires a complete restart sequence. The
overvoltage level is programmable.
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 when operating in current mode. A
maximum level of 1 V allows to limit the inductor current either in current or
voltage mode of operation.
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 ensures a discontinuous
mode of operation. This function can be inhibited by connecting Pin 8 to
GND.
9
Standby Current Set
Using an external resistor connected to this pin, the standby burst mode
peak current can be adjusted.
10
CT
The normal 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/Dmax/Voltage–Mode
A capacitor or a resistor or a voltage source connected to this pin can
temporary or permanently control the effective switching duty–cycle. This
pin can be used as a voltage mode control input. By connecting pin 11 to
Ground, the MC44604 can be shut down.
12
Clamp Error Amplifier Input
In normal mode, the current drawn from this pin, is used by the Error
Amplifier to perform the regulation. A 4.7 V zener diode clamps the voltage
of this pin.
13
E/A Out
The error amplifier output is made available for loop compensation.
14
Voltage Feedback
This is the inverting input of the Error Amplifier. It uses a voltage that is built
up using the current drawn from the pin 12.
15
Standby Management
This block is designed to detect the standby mode. It particularly
determines if the circuit must work in standby or in normal mode at each
start–up. For that, it uses an information given by an external
arrangement consisting of an opto–coupler. In standby mode, this
block makes the circuit work in the standby configuration, and the current
injected in the pin 15 is used to perform the regulation. In normal mode,
this pin is internally connected to the pin 12.
16
RREF
The RREF values fixes the internal reference current which is 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 |
|---|---|
| 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 |
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