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參數(shù)資料
| 型號(hào)： | MC33023DWG |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | High Speed Single−Ended PWM Controller |
| 中文描述： | 2 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | LEAD FREE, SOIC-16 |
| 文件頁(yè)數(shù)： | 11/18頁(yè) |
| 文件大?。?/td> | 450K |
| 代理商： | MC33023DWG |
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MC34023, MC33023
http://onsemi.com
11
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 V
ref
, 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
R
T
The value of R
T
sets the charge current through timing Capacitor, C
T
.
6
C
T
In conjunction with R
T
, the timing Capacitor sets the switching frequency.
7
Ramp Input
For voltage mode operation this pin is connected to C
T
. For current mode operation this pin is
connected through a filter to the current sensing element.
8
SoftStart
A capacitor at this pin sets the SoftStart time.
9
Current Limit/
Shutdown
This pin has two functions. First, it provides cyclebycycle current limiting. Second, if the current is
excessive, this pin will reinitiate a SoftStart cycle.
10
Ground
This pin is the ground for the control circuitry.
11
Current Limit
Reference Input
This pin voltage sets the threshold for cyclebycycle 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
V
C
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
V
CC
This pin is the positive supply of the control IC.
16
V
ref
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
V
ref
C
T
Figure 22. 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.
V
ref
Output Voltage
Feedback Input
2
1
3
7
6
5
4
1.25 V
Oscillator
C
T
From Current
Sense Element
Figure 23. 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 turnon of a power MOSFET.
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相關(guān)代理商/技術(shù)參數(shù) |
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| MC33023DWR2 | 功能描述:電流型 PWM 控制器 Single Ended Voltage RoHS:否 制造商:Texas Instruments 開(kāi)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 |
| MC33023DWR2G | 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(kāi)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 |
| MC33023P | 制造商:Motorola 功能描述:MOTOROLA S1I2F |
| MC33024 | 制造商:SPC Multicomp 功能描述:FINGER GUARD 制造商:SPC Multicomp 功能描述:FINGER GUARD; For Use With:127mm Axial Fans; Fan Size:127mm; Fixing Centers:113.3mm; Guard Material:Steel; Accessory Type:Finger Guard; Color:Chrome; External Depth:5.5mm; External Height:115.6mm; External Width:115.6mm ;RoHS Compliant: Yes |
| MC33025 | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:High Speed Double-Ended PWM Controller |
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