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參數(shù)資料
| 型號(hào)： | UC2854Q |
| 廠商： | Texas Instruments, Inc. |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | High Power Factor Preregulator |
| 中文描述： | 高功率因數(shù)前置穩(wěn)壓器 |
| 文件頁(yè)數(shù)： | 6/9頁(yè) |
| 文件大?。?/td> | 281K |
| 代理商： | UC2854Q |
TYPICAL CHARACTERISTICS at T
A
= T
J
= 25
o
C (cont.)
Multiplier Output vs Multiplier Inputs with Mult Out=0V
UC1854
UC2854
UC3854
I
AC
,
μ
A
Mult Out
μ
A
0
100
200
300
400
500
600
0
100
200
300
400
500
V
RMS
=1.5V
VA Out=1.25V
VA Out=2.5V
VA Out=3.5V
I
AC
,
μ
A
Mult Out
μ
A
0
50
100
150
200
250
0
100
200
300
400
500
V
RMS
=3V
VA Out=1.25V
VA Out=2V
VA Out=3V
VA Out=5V
I
AC
,
μ
A
Mult Out,
μ
A
0
20
40
60
80
100
120
140
0
100
200
300
400
500
V
RMS
=5V
VA Out=5V
VA Out=1.5V
VA Out=3V
I
AC
,
μ
A
Mult Out
μ
A
0
20
40
60
80
100
120
140
160
0
100
200
300
400
500
V
RMS
=4V
VA Out=1.25V
VA Out=2V
VA Out=3V
VA Out=4V
VA Out=5V
APPLICATIONS INFORMATION
A 250W PREREGULATOR
The circuit of Figure 1 shows a typical application of the
UC3854 as a preregulator with high power factor and effi-
ciency. The assembly consists of two distinct parts, the
control circuit centering on the UC3854 and the power
section.
The power section is a "boost" converter, with the induc-
tor operating in the continuous mode. In this mode, the
duty cycle is dependent on the ratio between input and
output voltages; also, the input current has low switching
frequency ripple, which means that the line noise is low.
Furthermore, the output voltage must be higher than the
peak value of the highest expected AC line voltage, and
all components must be rated accordingly.
In the control section, the UC3854 provides PWM pulses
(GT Drv, Pin 16) to the power MOSFET gate. The duty
cycle of this output is simultaneously controlled by four
separate inputs to the chip:
INPUT
PIN #
FUNCTION
V
SENSE
........................11.......... Output DC Voltage
I
AC
.................................6.......... LineVoltage Waveform
I
SENSE
/Mult Out .........4/5.......... Line Current
V
RMS
.............................8.......... RMS Line Voltage
Additional controls of an auxiliary nature are provided.
They are intended to protect the switching power MOS-
FETS from certain transient conditions, as follows:
INPUT
PIN #
FUNCTION
ENA ............................10.......... Start-Up Delay
SS...............................13.......... Soft Start
PKLIM...........................2.......... Maximum Current Limit
6
相關(guān)PDF資料 |
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|---|---|
| UC1854N | ; Leaded Process Compatible:Yes; Peak Reflow Compatible (260 C):Yes RoHS Compliant: Yes |
| UC3854J | High Power Factor Preregulator |
| UC3854L | High Power Factor Preregulator |
| UC1854DW | High Power Factor Preregulator |
| UC1855 | High Performance Power Factor Preregulator |
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| UC2855ADW | 功能描述:功率因數(shù)校正 IC High Performance Preregulator RoHS:否 制造商:Fairchild Semiconductor 開(kāi)關(guān)頻率:300 KHz 最大功率耗散: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Reel |
| UC2855ADWG4 | 功能描述:功率因數(shù)校正 IC High Performance Preregulator RoHS:否 制造商:Fairchild Semiconductor 開(kāi)關(guān)頻率:300 KHz 最大功率耗散: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Reel |
| UC2855ADWTR | 功能描述:功率因數(shù)校正 IC High Performance Preregulator RoHS:否 制造商:Fairchild Semiconductor 開(kāi)關(guān)頻率:300 KHz 最大功率耗散: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Reel |
| UC2855ADWTRG4 | 功能描述:功率因數(shù)校正 IC High Performance Preregulator RoHS:否 制造商:Fairchild Semiconductor 開(kāi)關(guān)頻率:300 KHz 最大功率耗散: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Reel |
| UC2855AN | 功能描述:功率因數(shù)校正 IC High Performance Preregulator RoHS:否 制造商:Fairchild Semiconductor 開(kāi)關(guān)頻率:300 KHz 最大功率耗散: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Reel |
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