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參數(shù)資料
| 型號： | MC34262 |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | Power Factor Controllers(功率因數(shù)控制器) |
| 中文描述： | 功率因數(shù)控制器（功率因數(shù)控制器） |
| 文件頁數(shù)： | 9/19頁 |
| 文件大小： | 394K |
| 代理商： | MC34262 |
MC34262, MC33262
http://onsemi.com
9
A Quickstart circuit has been incorporated to optimize
converter startup. During initial startup, compensation
capacitor C
1
will be discharged, holding the error amp
output below the Multiplier threshold. This will prevent
Drive Output switching and delay bootstrapping of
capacitor C
4
by diode D
6
. If Pin 2 does not reach the
multiplier threshold before C
4
discharges below the lower
UVLO threshold, the converter will “hiccup” and
experience a significant startup delay. The Quickstart
circuit is designed to precharge C
1
to 1.7 V, Figure 7. This
level is slightly below the Pin 2 Multiplier threshold,
allowing immediate Drive Output switching and bootstrap
operation when C
4
crosses the upper UVLO threshold.
Drive Output
The MC34262/MC33262 contain a single totempole
output stage specifically designed for direct drive of power
MOSFETs. The Drive Output is capable of up to
±
500 mA
peak current with a typical rise and fall time of 50 ns with
a 1.0 nF load. Additional internal circuitry has been added
to keep the Drive Output in a sinking mode whenever the
Undervoltage Lockout is active. This characteristic
eliminates the need for an external gate pulldown resistor.
The totempole output has been optimized to minimize
crossconduction current during high speed operation. The
addition of two 10
resistors, one in series with the source
output transistor and one in series with the sink output
transistor, helps to reduce the crossconduction current and
radiated noise by limiting the output rise and fall time. A
16 V clamp has been incorporated into the output stage to
limit the high state V
OH
. This prevents rupture of the
MOSFET gate when V
CC
exceeds 20 V.
APPLICATIONS INFORMATION
The application circuits shown in Figures 19, 20 and 21
reveal that few external components are required for a
complete power factor preconverter. Each circuit is a peak
detecting currentmode boost converter that operates in
critical conduction mode with a fixed ontime and variable
offtime. A major benefit of critical conduction operation
is that the current loop is inherently stable, thus eliminating
the need for ramp compensation. The application in
Figure 19 operates over an input voltage range of 90 Vac to
138 Vac and provides an output power of 80 W (230 V at
350 mA) with an associated power factor of approximately
0.998 at nominal line. Figures 20 and 21 are universal input
preconverter examples that operate over a continuous input
voltage range of 90 Vac to 268 Vac. Figure 20 provides an
output power of 175 W (400 V at 440 mA) while Figure 21
provides 450 W (400 V at 1.125 A). Both circuits have an
observed worstcase power factor of approximately 0.989.
The input current and voltage waveforms of Figure 20 are
shown in Figure 22 with operation at 115 Vac and 230 Vac.
The data for each of the applications was generated with the
test setup shown in Figure 24.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MC34262D | 功能描述:功率因數(shù)校正 IC Critical Mode PFC RoHS:否 制造商:Fairchild Semiconductor 開關(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 |
| MC34262DG | 功能描述:功率因數(shù)校正 IC Critical Mode PFC w/OVP RoHS:否 制造商:Fairchild Semiconductor 開關(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 |
| MC34262DG | 制造商:ON Semiconductor 功能描述:Driver IC |
| MC34262DR2 | 功能描述:功率因數(shù)校正 IC Critical Mode PFC RoHS:否 制造商:Fairchild Semiconductor 開關(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 |
| MC34262DR2G | 功能描述:功率因數(shù)校正 IC Critical Mode PFC w/OVP RoHS:否 制造商:Fairchild Semiconductor 開關(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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