UC3848DW

更新时间： 2024-11-23 13:00:39

品牌	Logo	应用领域
德州仪器 - TI		控制器
页数	文件大小	规格书
9页	361K
描述
2.2A SWITCHING CONTROLLER, 1000kHz SWITCHING FREQ-MAX, PDSO16, GREEN, PLASTIC, SOIC-16

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技术参数
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替代型号

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UC3848DW 技术参数

是否无铅：	不含铅	是否Rohs认证：	符合
生命周期：	Obsolete	包装说明：	SOP, SOP16,.4
Reach Compliance Code：	unknown	ECCN代码：	EAR99
HTS代码：	8542.39.00.01	风险等级：	5.72
模拟集成电路 - 其他类型：	SWITCHING CONTROLLER	控制模式：	CURRENT-MODE
控制技术：	PULSE WIDTH MODULATION	最大输入电压：	20 V
最小输入电压：	11 V	标称输入电压：	12 V
JESD-30 代码：	R-PDSO-G16	JESD-609代码：	e4
长度：	10.3 mm	湿度敏感等级：	2
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：	2.2 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）：	260	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：	SINGLE
最大切换频率：	1000 kHz	技术：	BIPOLAR
温度等级：	COMMERCIAL	端子面层：	Nickel/Palladium/Gold (Ni/Pd/Au)
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：	7.5 mm	Base Number Matches：	1

UC3848DW 数据手册

UC1848

UC2848

UC3848

Average Current Mode PWM Controller

BLOCK DIAGRAM

FEATURES

• Practical Primary Side Control of

Isolated Power Supplies with DC

Control of Secondary Side Current

• Accurate Programmable Maximum

Duty Cycle Clamp

• Maximum Volt-Second Product Clamp

to Prevent Core Saturation

• Practical Operation Up to 1MHz

• High Current (2A Pk) Totem Pole

Output Driver

• Wide Bandwidth (8MHz) Current Error

Amplifier

• Under Voltage Lockout Monitors VCC,

VIN and VREF

• Output Active Low During UVLO

• Low Startup Current (500µA)

• Precision 5V Reference (1%)

UDG-93003-1

DESCRIPTION

The UC3848 family of PWM control ICs makes primary output driver. The current error amplifier easily interfaces

side average current mode control practical for isolated with an optoisolator from a secondary side voltage sens-

switching converters. Average current mode control in- ing circuit.

sures that both cycle by cycle peak switch current and

A full featured undervoltage lockout (UVLO) circuit is con-

maximum average inductor current are well defined and

tained in the UC3848. UVLO monitors the supply voltage

will not run away in a short circuit situation. The UC3848

to the controller (VCC), the reference voltage (VREF),

can be used to control a wide variety of converter topolo-

and the input line voltage (VIN). All three must be good

before soft start commences. If either VCC or VIN is low,

gies.

In addition to the basic functions required for pulse width

modulation, the UC3848 implements a patented tech-

nique of sensing secondary current in an isolated buck

derived converter from the primary side. A current wave-

form synthesizer monitors switch current and simulates

the inductor current down slope so that the complete cur-

rent waveform can be constructed on the primary side

without actual secondary side measurement. This infor-

mation on the primary side allows for full DC control of

output current.

the supply current required by the chip is only 500µA and

the output is actively held low.

Two on board protection features set controlled limits to

prevent transformer core saturation. Input voltage is mon-

itored and pulse width is constrained to limit the maxi-

mum volt-second product applied to the transformer. A

unique patented technique limits maximum duty cycle

within 3% of a user programmed value.

These two features allow for more optimal use of trans-

formers and switches, resulting in reduced system size

and cost.

The UC3848 circuitry includes a precision reference, a

wide bandwidth error amplifier for average current con-

trol, an oscillator to generate the system clock, latching

PWM comparator and logic circuits, and a high current

Patents embodied in the UC3848 belong to Lambda

Electronics Incorporated and are licensed for use in ap-

plications employing these devices.

4/96

12 3 4 5 6 7...9

中文翻译

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UC3848DW 替代型号

型号	品牌	替代类型	描述	数据表
UC2848DW	TI	完全替代	2.2A SWITCHING CONTROLLER, 1000kHz SWITCHING FREQ-MAX, PDSO16
UC3848N	TI	类似代替	Average Current Mode PWM Controller

与UC3848DW相关器件

型号	品牌	获取价格	描述	数据表
UC3848G-D08-T	UTC	获取价格	HIGH PERFORMANCE CURRENT MODE CONTROLLERS
UC3848G-S08-R	UTC	获取价格	HIGH PERFORMANCE CURRENT MODE CONTROLLERS
UC3848L-D08-T	UTC	获取价格	HIGH PERFORMANCE CURRENT MODE CONTROLLERS
UC3848L-S08-R	UTC	获取价格	HIGH PERFORMANCE CURRENT MODE CONTROLLERS
UC3848L-S08-T	UTC	获取价格	暂无描述
UC3848N	TI	获取价格	Average Current Mode PWM Controller
UC3848Q	TI	获取价格	2A SWITCHING CONTROLLER, 1000kHz SWITCHING FREQ-MAX, PQCC20, PLASTIC, LCC-20
UC3848QTR	TI	获取价格	2.2A SWITCHING CONTROLLER, 1000kHz SWITCHING FREQ-MAX, PQCC20
UC3848-S08-R	UTC	获取价格	Switching Regulator/Controller
UC3848-S08-T	UTC	获取价格	Switching Regulator/Controller

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