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| 型号： | MC34262P |
| 厂商： | ON Semiconductor |
| 文件页数： | 9/19页 |
| 文件大小： | 394K |
| 描述： | IC CTRLR PFC PRECONVERTER 8-DIP |
| 产品变化通告： | LTB Notification 03/Jan/2008 |
| 标准包装： | 50 |
| 模式： | 临界传导（CRM） |
| 电流 - 启动： | 250µA |
| 电源电压： | 12 V ~ 28 V |
| 工作温度： | 0°C ~ 85°C |
| 安装类型： | 通孔 |
| 封装/外壳： | 8-DIP（0.300"，7.62mm） |
| 供应商设备封装： | 8-PDIP |
| 包装： | 管件 |
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 8. 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 ?00 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 W 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 20, 21 and 22
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 20 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 21 and 22 are universal input
preconverter examples that operate over a continuous input
voltage range of 90 Vac to 268 Vac. Figure 21 provides an
output power of 175 W (400 V at 440 mA) while Figure 22
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 21 are
shown in Figure 23 with operation at 115 Vac and 230 Vac.
The data for each of the applications was generated with the
test setup shown in Figure 25.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MC34262PG | 功能描述:功率因数校正 IC Critical Mode PFC w/OVP RoHS:否 制造商:Fairchild Semiconductor 开关频率:300 KHz 最大功率耗散: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Reel |
| MC34262PG | 制造商:ON Semiconductor 功能描述:Power Supply IC |
| MC34268D | 功能描述:低压差稳压器 - LDO 2.85V 800mA SCSI-2 RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| MC34268DG | 功能描述:低压差稳压器 - LDO 2.85V 800mA SCSI-3 Active Terminator RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| MC34268DR2 | 功能描述:低压差稳压器 - LDO 2.85V 800mA SCSI-4 RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
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