Datasheet > UCC3858DWTR

UCC3858DWTR

更新时间： 2024-11-08 19:43:07

品牌	Logo	应用领域
德州仪器 - TI		光电二极管
页数	文件大小	规格书
13页	359K
描述
High Efficiency, High Power Factor Preregulator 16-SOIC 0 to 70

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UCC3858DWTR 技术参数

是否无铅：	含铅	是否Rohs认证：	不符合
生命周期：	Obsolete	零件包装代码：	SOIC
包装说明：	SOP, SOP16,.4	针数：	16
Reach Compliance Code：	not_compliant	ECCN代码：	EAR99
HTS代码：	8542.39.00.01	风险等级：	5.92
模拟集成电路 - 其他类型：	POWER FACTOR CONTROLLER	控制模式：	CURRENT-MODE
控制技术：	PULSE WIDTH MODULATION	最大输入电压：	18 V
最小输入电压：	12 V	标称输入电压：	12 V
JESD-30 代码：	R-PDSO-G16	长度：	10.285 mm
功能数量：	1	端子数量：	16
最高工作温度：	70 °C	最低工作温度：
最大输出电流：	0.5 A	封装主体材料：	PLASTIC/EPOXY
封装代码：	SOP	封装等效代码：	SOP16,.4
封装形状：	RECTANGULAR	封装形式：	SMALL OUTLINE
峰值回流温度（摄氏度）：	NOT SPECIFIED	认证状态：	Not Qualified
座面最大高度：	2.65 mm	子类别：	Switching Regulator or Controllers
表面贴装：	YES	切换器配置：	BOOST
技术：	BCDMOS	温度等级：	COMMERCIAL
端子形式：	GULL WING	端子节距：	1.27 mm
端子位置：	DUAL	处于峰值回流温度下的最长时间：	NOT SPECIFIED
宽度：	7.49 mm	Base Number Matches：	1

UCC3858DWTR 数据手册

UCC1858

UCC2858

UCC3858

PRELIMINARY

High Efficiency, High Power Factor Preregulator

FEATURES

DESCRIPTION

• Programmable PWM Frequency

Foldback for Higher Efficiency at Light

Loads

The UCC3858 provides all of the control functions necessary for active

power factor corrected preregulators which require high efficiency at low

power operation. The controller achieves near unity power factor by

shaping the AC input line current waveform to correspond to the AC input

line voltage using average current mode control.

• Leading Edge PWM for Reduced

Output Capacitor Ripple Current

The operation of the UCC3858 closely resembles that of previously de-

signed Unitrode PFC parts with additional features to allow higher effi-

ciency boost converter operation at light loads. This is accomplished by

linearly scaling back the PWM frequency when the output of the voltage

error amplifier drops below a predetermined user programmable level in-

dicating a light load condition. The frequency is scaled back by reducing

the charging current for the CT ramp (in proportion to the output power),

and increasing the dead time. There is also an instantaneous reset input

to pull the IC out of foldback mode quickly when the load comes back up.

• Controls Boost PWM to Near Unity

Power Factor

• World Wide Operation without

Switches

• Accurate Power Limiting

• Synchronizable Oscillator

• 100µA Startup Supply Current

• Low Power BCDMOS

The PWM technique used in the UCC3858 is leading edge modulation.

When combined with the more conventional trailing edge modulation on

the downstream converter, this scheme offers the benefit of reduced rip-

ple current on the bulk storage capacitor. The oscillator is designed for

easy synchronization to the downstream converter. A simple synchroni-

zation scheme can be implemented by connecting the PWM output of

the downstream converter to the SYNC pin.

• 12V to 18V Operation

(continued)

BLOCK DIAGRAM

UDG-96191-1

03/99

12 3 4 5 6 7...13

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与UCC3858DWTR相关器件

型号	品牌	获取价格	描述	数据表
UCC3858J	ETC	获取价格	Analog IC
UCC3858N	TI	获取价格	High Efficiency, High Power Factor Preregulator
UCC386	TI	获取价格	LOW-DROPOUT 200-mA LINEAR REGULATOR
UCC386_08	TI	获取价格	LOW-DROPOUT 200mA LINEAR REGULATOR
UCC386DP	TI	获取价格	LOW-DROPOUT 200mA LINEAR REGULATOR
UCC386DPTR	ETC	获取价格	Positive Fixed Voltage Regulator
UCC386PW	TI	获取价格	LOW-DROPOUT 200mA LINEAR REGULATOR
UCC386PWTR	TI	获取价格	LOW-DROPOUT 200mA LINEAR REGULATOR
UCC387	TI	获取价格	LOW-DROPOUT 200-mA LINEAR REGULATOR
UCC387DP	TI	获取价格	LOW-DROPOUT 200mA LINEAR REGULATOR

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