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參數(shù)資料
| 型號： | MC34023 |
| 廠商： | ON SEMICONDUCTOR |
| 英文描述： | High Speed Single-Ended PWM Controller |
| 中文描述： | 高速單端PWM控制器 |
| 文件頁數(shù)： | 10/19頁 |
| 文件大小： | 470K |
| 代理商： | MC34023 |
MC34023 MC33023
10
MOTOROLA ANALOG IC DEVICE DATA
PIN FUNCTION DESCRIPTION
Pin
DIP/SOIC
Function
Description
1
Error Amp
Inverting
Input
This pin is usually used for feedback from the output of the power supply.
2
Error Amp
Noninverting
Input
This pin is used to provide a reference in which an error signal can be produced on the output of the
error amp. Usually this is connected to Vref, however an external reference can also be used.
3
Error Amp
Output
This pin is provided for compensating the error amp for poles and zeros encountered in the power
supply system, mostly the output LC filter.
4
Clock
This is a bidirectional pin used for synchronization.
5
RT
CT
Ramp Input
The value of RT sets the charge current through timing Capacitor, CT.
In conjunction with RT, the timing Capacitor sets the switching frequency.
For voltage mode operation this pin is connected to CT. For current mode operation this pin is
connected through a filter to the current sensing element.
6
7
8
Soft–Start
A capacitor at this pin sets the Soft–Start time.
9
Current Limit/
Shutdown
This pin has two functions. First, it provides cycle–by–cycle current limiting. Second, if the current is
excessive, this pin will reinitiate a Soft–Start cycle.
10
Ground
This pin is the ground for the control circuitry.
11
Current Limit
Reference
Input
This pin voltage sets the threshold for cycle–by–cycle current limiting.
12
Power Ground
This is a separate power ground return that is connected back to the power source. It is used to reduce
the effects of switching transient noise on the control circuitry.
13
VC
This is a separate power source connection for the outputs that is connected back to the power source
input. With a separate power source connection, it can reduce the effects of switching transient noise
on the control circuitry.
14
Output
This is a high current totem pole output.
15
VCC
Vref
This pin is the positive supply of the control IC.
16
This is a 5.1 V reference. It is usually connected to the noninverting input of the error amplifier.
Output Voltage
Feedback Input
2
1
3
7
6
5
4
1.25 V
Oscillator
Vref
CT
Figure 21. Voltage Mode Operation
In voltage mode operation, the control range on the output of the Error
Amplifier from 0% to 90% duty cycle is from 2.25 V to 4.05 V.
Vref
Output Voltage
Feedback Input
2
1
3
7
6
5
4
1.25 V
Oscillator
CT
From Current
Sense Element
Figure 22. Current Mode Operation
In current mode control, an RC filter should be placed at the ramp input
to filter the leading edge spike caused by turn–on of a power MOSFET.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MC34023_05 | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:High Speed Single−Ended PWM Controller |
| MC34023P | 功能描述:電流型 PWM 控制器 Single Ended Voltage 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 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| MC34023PG | 功能描述:電流型 PWM 控制器 Single Ended Voltage or Current Mode 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 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| MC34025 | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:High Speed Double-Ended PWM Controller |
| MC34025_05 | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:High Speed Double−Ended PWM Controller |
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